CAT.ES20-165 A Overall length reduced by 140 mm at the maximum * Height reduced by 36% at the maximum * ∗ Comparison with Series MY1B Scale: 100% (MY3A16-100) Mechanically Jointed Rodless Cylinder High functionality with reduced height and length Series MY3A/3B ø16, ø25, ø40, ø63 Basic Short Type Standard Type
40
Embed
Mechanically Jointed Rodless Cylinder - SMC · Note 2) For operation outside the “Stroke adjusting unit/Fine stroke adjustment range” on page 7. Note 3) The maximum operating
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CAT.ES20-165 A
Overall lengthreduced by140 mm
at the maximum *
Height reduced by 36% at the maximum*
∗ Comparison with Series MY1B
Scale: 100%(MY3A16-100)
Mechanically Jointed Rodless Cylinder
High functionality with reduced height and length
Series MY3A/3Bø16, ø25, ø40, ø63
BasicShort Type Standard Type
MY3A_3B.qxd 03.5.14 2:47 PM Page 1
Features 1
Series
MY3AMY3BMY1B
ø16
110
122
160
ø25
150
178
220
ø40
240
276
340
ø63
320
356
460
(mm)
Series
MY3AMY3B
MY1B
ø16
27
37
ø25
37
54
ø40
54
84
ø63
(mm)
MY1B (with air cushion)
MY3B (with air cushion)
MY3A (with rubber bumper)
MY1B MY3A/3B
High functionality with reduced height and length
Overall length (Z) reduced by 140 mm at the maximum
Overall Length (Z) Weight
Height (H) reduced by 36% at the maximum
Weight reduced by 53% at the maximum
Series
MY3AMY3BMY1B
ø16
0.34
0.35
0.73
ø25
0.99
1.09
1.57
ø40
2.95
3.08
4.41
ø63
8.26
8.99
14.5
(kg)
Height (H)
Hei
ght
Overall length (Z + Stroke)
∗ At a 100 mm stroke
Side support
Auto switch
Positioning cushion mechanism
Air cushion(MY3B)
Passage for centralized piping
The uniquely designed pis-ton shape enables reduction of the height and length as well as practical arrange-ment of the common piping passages, cushion mecha-nism and positioning mecha-nism. This has achieved drastic miniaturization and weight reduction.
MY3BMY3BMY3BMY3B
Mechanically Jointed Rodless Cylinder/Basic
MY3A/MY3BShort Type Standard Type(Rubber Bumper) (Air Cushion)
Series variationsSeries variationsSeries variationsSeries variations
Stroke adjusting unit
Side supports
The cylinder tube can be fixed from the upper or lower side (page 8).
Centralized piping
Can be mounted on both sidesfrom the front direction.
(MY3B only)
Floating bracket
Integrated piping in the head cover is possible.(Refer to page 32.)
Auto switch
Easy connection with external guide. Vertical and lateral mounting is possible. (page 9)
MY3A_3B.qxd 03.5.14 2:47 PM Page 3
Note 2)
Series MY3A/3B
The general selection procedure is described here for the use of the most suitable model of Series MY3A/B that will satisfy the requirements.
Model Selection 1
Standards for Tentative Model Selection
Cylinder modelGraphs for relatedallowable values
M2: RollingM1: Pitching
M3: Yawing
Type Standards for guide selection
MY3A
MY3BGuaranteed accuracy not required, generally combined with a separate guide, stroke accuracy of cylinder body and air cushion required.
Basic short type
Basic standard type
Guaranteed accuracy not required, generally combined with a separate guide, stroke accuracy not required, overall length to be minimized. Refer to
page 4.
Strokepositioning
Cylinderstroke end
Strokeadjusting unit
(option)
Externalshock
absorber
Externalguide
None
None
Yes
None
Yes
–
–
L
H
–
–
Applicableunit
500 800 1000 1500
(mm/s)Maximum operating speed
MY3A
MY3B
MY3B
MY3A
MY3B
MY3A
MY3B
Use of X416, X417 holdermounting brackets
(Holder mounting bracket→ Refer to pages 27 through 28)
Note 1) For operation at a speed exceeding 1000 mm/s, the shock absorber should satisfy the conditions on page 8.Note 2) For operation outside the “Stroke adjusting unit/Fine stroke adjustment range” on page 7.Note 3) The maximum operating speed with the use of the L unit of ø16 is 800 mm/s within the fine stroke adjustment range and 500 mm/s outside the fine stroke adjustment range.Note 4) As the external shock absorber, a unit with appropriate capacity and features should be installed close to the load center of gravity.Note 5) The selection confirmation is extremely important with this series. The selection should be confirmed thoroughly according to the selection flow on page 2.
1
Note 3)
Note 4)
Note 1)
MY3A_3B.qxd 03.5.14 2:47 PM Page 4
2
Model Selection Series MY3A/3B
Selection Flow Chart
When an external guide is used, the selection confirmation of the guide capacity should follow the selection procedure of the external guide.MY3A and MY3B allow direct load application within the allowable range for the built-in guide. The payload in this case will vary depending on the driving speed and the mounting orientation of the cylinder. Please refer to the flow below and confirm the selection. (For more detailed description of the selection flow, please refer to the instruction manual.)
Tentative selection of cylinder modelMY3A: Basic short typeMY3B: Basic standard type
Applicable NoSelect a guide suitable
for the application.
Selection of cylinderused alone
NG
OK
Examine of cushioningmechanism at stroke end
Strokeadjusting unit
Built-incushion
OK
NG NG
NG
Built-in cushion
OKExternal
cushioningunit
Examine auto switchmounting (model)
Model selected
OK
Reexamine operating conditions
Examine of cushioningmechanism at stroke end
∗ When using an external cushioning unit, we recommend installing a suitable unit near the load's center of gravity.It is possible to select all models of mechanically jointed rodless cylinder (series MY3A, MY3B) according to the procedure indicated above.Refer to the separate instruction manual for further explanation, and consult SMC regarding any questions.
Determinationof load weightand allowable
moment
Changeguide type
∗Please refer to informationby the guide
manufacturer.
MY3A_3B.qxd 03.5.14 2:47 PM Page 5
Dynamic moment M2E does notgenerated.
Series MY3A/3B
3
Types of Moment Applied to Rodless Cylinders
Multiple moments may be generated depending on the mounting orientation, load and position of the center of gravity.
Coordinates and moments
Static moment
Dynamic moment
Horizontal mounting Wall mounting
Vertical mounting
Ceiling mounting
Mounting orientation
Static load m
Horizontal
m1
Ceiling
m2
Wall
m3
Verticalm4
M1
M2
M3
m1 × g × X
m1 × g × Y
—
m2 × g × X
m2 × g × Y
—
—
m3 × g × Z
m3 × g × X
m4 × g × Z
—
m4 × g × Y
MountingorientationDynamicload FE
Horizontal Ceiling Wall Vertical
M1E
M2E
M3E
— × FE × Z
— × FE × Y
13
1.4υa × δ × mn × g
13
Note) m4 is a mass movable by thrust. Use 0.3 to 0.7 times the thrust (differs depending on the operating speed) as a guide for actual use.
Note) Regardless of the mounting orientation, dynamic moment is calculated with the formulae above.
g: Gravitational acceleration
g: Gravitational acceleration, υa: Average speed, δ: Bumper coefficient (Refer to page 22)
M3E
FE
M3
Y
υa
z
y
M3: Yawing
x M2: Rolling
M1: Pitching
m3 × gx
M2
z
M3
XZ
y
m1 × g
M1
Xx
M2
Y
y
m2 × g
M1
Xx
M2
Y
m4 × g
M1
Z
M3
zyY
M1
mn × gM1E
FE
Z
υa
mn×g
Sta
ticm
omen
t
Dyn
amic
mom
ent
Note)
MY3A_3B.qxd 03.5.14 2:47 PM Page 6
4
Mechanically Jointed Rodless Cylinder Series MY3A/3B
Model
MY3AMY3BMY3AMY3BMY3AMY3BMY3AMY3B
Bore size(mm)
16
25
40
63
Maximum allowable moment (Nm)
M1 M2 M3 Maximum load weight (kg)
m1 m2 m3
1.8
6
24
70
0.7
2
10
30
1.5
4
10
20
6
16
40
80
3
6
12
24
0.3
1.2
4.8
19
Maximum Allowable Moment/Maximum Load Weight
The above values are the maximum allowable values for moment and load. Refer to each graph on page 5 regarding the maximum allowable moment and maximum load weight for a particular piston speed.
Moment (Nm)
Prior to the selection calculation, verify the conformity of the operating conditions, such as the use of an external guide (in case of connection with a floating mechanism bracket, for example) or a stroke adjusting unit, with the maximum operating speed. (Refer to page 1.)
Calculation of guide load factor
1. Maximum load weight (1), static moment (2), and dynamic moment (3) (at the time of impact with stopper) must be examined for the selection calculations.∗ To evaluate, use υa (average speed) for (1) and (2), and υ (impact speed υ = 1.4υa) for (3). Calculate m max for (2) from the maximum allowable load graph (m1, m2, m3 ) and Mmax for (2) and (3) from the maximum allowable moment graph (M1, M2, M3).
2. Reference formulas [Dynamic moment at impact] Use the following formulas to calculate dynamic moment when taking stopper impact into consideration.m : Load weight (kg)F : Load (N)FE : Load equivalent to impact (at impact with stopper) (N)υa : Average speed (mm/s)M : Static moment (Nm) υ = 1.4υa (mm/s) FE = 1.4υa × δ × m • g
1ME = — • FE • L1 = 4.57υaδm L1 (Nm)
3Note 4) 1.4υaδ is a dimension less coefficient for calculating impact force.
Note 5) Average load coefficient = :
This coefficient is for averaging the maximum load moment at thetime of stopper impact according to service life calculations.
3. For detailed selection procedure, please refer to pages 9 to 10.
υ : Impact speed (mm/s)L1 : Distance to the load’s center of gravity (m)ME: Dynamic moment (Nm)δ : Bumper coefficient (kg)
With rubber bumper = 4/100With air cushion = 1/100With shock absorber = 1/100
g : Gravitational acceleration (9.8 m/s2)
Σα = + + < 1=Load weight [m]
Maximum load weight[m max]
Static moment [M]Allowable static moment
[Mmax]
Note 1) Moment caused by the load, etc., with cylinder in resting condition.Note 2) Moment caused by the impact load equivalent at the stroke end (at the time of impact with stopper).Note 3) Depending on the shape of the work piece, multiple moments may occur. When this happens, the sum of the
load factors (Σα) is the total of all such moments.
Maximum allowable momentSelect the moment from within the range of operating limits shown in the graphs. Note that the maximum allowable load value may sometimes be exceeded even within the operating limits shown in the graphs. Therefore, also check the allowable load for the selected conditions.
Select the load from within the range of limits shown in the graphs. Note that the maximum allowable moment value may sometimes be exceeded even within the operating limits shown in the graphs. Therefore, also check the allowable moment for the selected conditions.Maximum allowable load
Maximum Allowable Moment/Maximum Allowable Load
MY3A_3B.qxd 03.5.14 2:47 PM Page 8
Cushion Capacity
Absorption capacity of rubber bumper (MY3A)
Rubber bumper displacement (additional stroke due to pressure on each side)
6
The stop position of the built-in rubber bumper of Series MY3A varies depending on the operating pressure. For alignement at the stroke end, find the guideline for the stroke end position in operation as follows. Find the incremental displacement at the operat-ing pressure in the graph and add it to the stroke end position at no pressurization. If positioning accuracy is required for the stop position at the stroke end, consider installing an external positioning mechanism or switching to the air cushion type (MY3B).
Note) In vertical operation, find the guideline for the stroke end position by adding, in case of the lower end, or subtracting, in case of the upper end, the pressure displacement equivalent to the self weight of the load.
Mechanically Jointed Rodless Cylinder Series MY3A/3B
For MY3A16 (Horizontal)
Operating pressure MPa
Add
ition
al s
trok
e m
m
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
00.80.70.60.50.40.30.20.1
(Horizontal)For MY3A40
Operating pressure MPa
Add
ition
al s
trok
e m
m
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
00.80.70.60.50.40.30.20.1
(Horizontal)For MY3A25
Operating pressure MPa
Add
ition
al s
trok
e m
m
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
00.80.70.60.50.40.30.20.1
(Horizontal)For MY3A63
Operating pressure MPa
Add
ition
al s
trok
e m
m
2.5
2.0
1.5
1.0
0.5
00.80.70.60.5 0.40.30.20.1
800.40.3
Load weight kg
Impa
ct s
peed
m
m/s
543210.2
1000
500
400
300
200
100
Rubber bumper
m3 maxm2 max m1 max
Horizontal impact: P = 0.5 MPaMY3A16
80
1000
500
400
300
200
100
Rubber bumper
80
Load weight kg
Impa
ct s
peed
m
m/s
2010541 2 3
1000
500
400
300
200
100
m3 maxm2 max m1 max
Horizontal impact: P = 0.5 MPaMY3A25
Load weight kg
Impa
ct s
peed
m
m/s
10 20 30 40 1002 3 4 5
m3 maxm2 max m1 max
Horizontal impact: P = 0.5 MPaMY3A63
Rubber bumper
80
500
400
300
200
100
Load weight kg
Impa
ct s
peed
m
m/s
10 20 30 40541 2 3
1000
m3 maxm2 max m1 max
Horizontal impact: P = 0.5 MPaMY3A40
Rubber bumper
MY3A_3B.qxd 03.5.14 2:47 PM Page 9
7
Calculation of absorbed energy for strokeadjusting unit with built-in shock absorber
Unit: N • m
Absorption Capacity of Air Cushion and Stroke Adjusting Unit (MY3B)
Note) The maximum operating speed will differ when the stroke adjusting unit is used outside the maximum fine stroke adjustment range (with reference to the fixed stroke end), such as at a fixed intermediate position (X416, X417). (Refer to the graph above.)
Note) The speed of the impacting object is measured at the time of impact with the shock absorber.
Note) With an operating pressure of 0.6 MPa or larger, the use of a cushion or an external shock absorber conforming to the conditions on page 26 is recommended.
Unit: mm
0 to -10
0 to -12
0 to -16
Stroke adjusting unitFine stroke adjustment range
Bore size (mm)
16
25
40
63
Fine stroke adjusting range (mm)
Cushion Capacity
Horizontal impact: P = 0.5 MPaMY3B25
Load weight kg
Impa
ct s
peed
m
m/s
2000
1000
500
400
300
200
100
80 5 10 20 504321
m3 maxm2 max m1 max
H unitAir cushion, L unit
Horizontal impact: P = 0.5 MPaMY3B40
Load weight kg
Impa
ct s
peed
m
m/s
2000
1000
500
400
300
200
100
805 10 20 30 404321
m3 maxm2 max m1 max
H unitAir cusion, L unit
Horizontal impact: P = 0.5 MPaMY3B63
Load weight kg
Impa
ct s
peed
m
m/s
2000
1000
500
400
300
200
100
805 10 20 30 40 100432
m3 maxm2 max m1 max
H unitAir cusion, L unit
Horizontal impact: P = 0.5 MPaMY3B16
Load weight kg
Impa
ct s
peed
m
m/s
2000
1000
500
400
300
200
100
800.3 4 5 10320.4 10.2
m3 maxm2 max m1 max
H unitAir cushion
L unit
12
Maximum collision speed (H, L)with fixed intermediate position
Maximum collision speed (H, L)with fixed intermediate position
Maximum collision speed (H, L)with fixed intermediate position
Maximum collision speed (H)with fixed intermediate position
Maximum collision speed(L) with fixed interme-
diate position
(Refer to Note 3 on page 19.)
MY3A_3B.qxd 03.5.14 2:47 PM Page 10
External Shock Absorber Selection
Selection confirmation items with use of external shock absorber
8
Allowable impact force with use of external shock absorber
Cylinder is used alone
When the positioning of the stop position is necessary or the absorption capacity of the built-in cushion is not sufficient, refer to the selection procedure below and consider the installation of an external shock absorber.
Cylinder load factor selection
External shock absorberImpact force and absorption
capacity confirmation
0.40.3 10543210.2
MY316
Col
lisio
n de
cele
ratio
n G
Weight kg
20304050
10
5432
1
240 N
m3 max m1 maxm2 max
50201054321
MY325
Col
lisio
n de
cele
ratio
n G 20
304050
10
5432
1
Weight kg
580 N
m3max m1maxm2max
4030201054321
MY340
20304050
10
5432
1
Col
lisio
n de
cele
ratio
n G
Weight kg
1500 N
m3 maxm1 max
m2 max
Note) The weight represents the equivalent weight including the thrust energy.
403020 100105432
MY363
20304050
10
5432
1
Col
lisio
n de
cele
ratio
n G
Weight kg
3700 N
External guide is used
External guide load factor selection
External shock absorberImpact force and absorption
capacity confirmation
Piston speed with use of external shock absorberBore size (mm) 16 25 40
80 to 1500 mm/s
63
m3 max m1 maxm2 max
MY3A
MY3B
Mechanically Jointed Rodless Cylinder Series MY3A/3B
An external shock absorber can be used within the above pis-ton speed range. In conjunction with the absorption capacity selection, however, also confirm the conditions which make the shock absorber collision impact force to stay within the al-lowable range in the graph.Use of an external shock absorber with conditions exceeding the allowable range may damage the cylinder.
To confirm the collision impact force of the shock absorb-er, first find the impact force or acceleration under the operating conditions using the selection information or selection software provided by the manufacturer, and then refer to the graph.(The selection should allow a sufficient margin because the value calculated by the selection software involves an error with reference to the actual value.)
The above calculation is within the allowable value, and therefore the selected model can be used. Select a shock absorber separately.In an actual calculation, when the sum of guide load factors Σα in the formula above is more than 1, consider decreasing the speed, increasing the bore size, or changing the product series.
4——100
1——3
1——3
1——3
1——3
M1
M3
Y
FE
FE
Z
M1E
M3E +
Calculation of Guide Load Factor
Mechanically Jointed Rodless Cylinder Series MY3A/3B
Series MY3A/3BMechanically Jointed Rodless Cylinder
Basic Type/ø16, ø25, ø40, ø63
16254063
16 mm25 mm40 mm63 mm
Cylinder bore size
StrokeRefer to the standard stroke table on page 2.
A
B
Short style(rubber bumper)
Standard(air cushion)
Type
NilLHLSSLHSSHLHHL
NilSn
2 pcs.1 pc.
“n” pcs.
Number of auto switches
Auto switch typeNil Without auto switch
How to Order
Basic MY3
Port thread type
16 300 LS F9B
Stroke adjusting unit appearance and mounting direction
Stroke adjusting unit (MY3B only)
Symbol
Nil
TNTF
TypeM thread
RcNPT
G
Bore sizeø16
ø25, ø40, ø63
A
Without adjusting unitWith shock absorber for low load at both sidesWith shock absorber for high load at both sides
With shock absorber for low load at left sideWith shock absorber for low load at right sideWith shock absorber for high load at left side
With shock absorber for high load at right sideOne L unit at left side and one H unit at right sideOne H unit at left side and one L unit at right side
∗ Lead wire length symbols: 0.5 m Nil (Example) F9NW3 m L F9NWL5 m Z F9NWZ
Notes) ∗ Solid state switches marked with a “” symbol are produced upon receipt of order. ∗ In addition to the models in the above table, there are some other auto switches
that are applicable. For more information, please refer to page 20.
Stroke adjusting unit
Installation exampleHL
Left
Right L unit
H unit
Port
Port
Applicable Auto Switch/Refer to pages 13 through 15 for detailed auto switch specifications.
Sol
id s
tate
sw
itch
Typ
e
Indi
cato
rlig
ht
Ree
dsw
itch
Load voltage
DC AC
Auto switch modelElectrical entry
Perpendicular In-line
Lead wire length (m)∗0.5(Nil)
3(L)
5(Z)
ICcircuit
ICcircuit
ICcircuit
Relay,PLC
Relay, PLC
A96
A93
M9N
M9P
M9B
F9NW
F9PW
F9BW
A96V
A93V
F9NV
F9PV
F9BV
F9NWV
F9PWV
F9BWV
100 V12 V
5 V
5 V12 V
12 V
5 V12 V
12 V
24 V
24 V2-wire
3-wire(NPN equiv.)Yes
YesGrommet
Electricalentry
Wiring(output)
Prewireconnector
Applicableload
Specialfunction
3-wire (NPN)
3-wire (PNP)
2-wire
3-wire (NPN)
3-wire (PNP)
2-wire
Diagnosticindication
2-colorindicator
Grommet
∗ Refer to the table below for auto switch model numbers.
∗ Auto switches are packed together when shipped (unassembled).
In case of MY3B
MY3A_3B.qxd 03.5.14 2:47 PM Page 14
12
Specifications Bore size (mm)
Fluid
Action
Operating pressure range
Proof pressure
Ambient and fluid temperature
Cushion
Lubricaton
Stroke length tolerance
Port size (Rc, NPT, G)
16 25 40
Air
Double acting
0.15 to 0.8 MPa
1.2 MPa
5 to 60°C
Rubber bumper (MY3A) / Air cushion (MY3B)
Non-lube
M5 × 0.8 1/8
Stroke Adjusting Unit SpecificationsBore size (mm)
Unit symbol
Shock absorber model
Fine stroke adjusting range (mm)
16 25 40 63
MY3B
L
RB0806
H
RB1007
L
RB1007
H
RB1412
L
RB1412
H
RB2015
L
RB2015
H
RB2725
Weight
Bore size (mm) Model
16
25
40
63
16
25
40
63
0.22
0.65
2.45
7.14
0.23
0.75
2.58
7.87
0.06
0.17
0.25
0.56
0.06
0.17
0.25
0.56
Basic weight
Additional weight
per 50 mm of stroke
Stroke adjusting unit weight(per unit)
Weight ofL unit
Weight ofH unit
0.04
0.10
0.26
0.57
0.05
0.15
0.30
0.92
Symbol
1/4
63
3/8
Calculation method/Example: MY3B25-300LBasic weight 0.75 kg
Refer to pages 27 through 28 regarding made to order specifications for series MY3A/B.
Shock Absorber Specifications
Model
Max. energy absorption (J)
Stroke absorption (mm)
Max. impact speed (mm/s)Max. operating frequency (cycles/min)
Springforce (N)
Operating temperature range (°C)
Extended
Compressed
RB2015
RB2725
RB0806
RB1007
RB1412
29.8
15
25
8.34
20.50
46.6
25
10
8.83
20.01
0.84
6
80
1.96
4.22
2.4
7
70
4.22
6.86
10.1
12
1000
45
6.86
15.98
5 to 60
MY3A
MY3B
Piston Speed Bore size (mm)
Without stroke adjusting unit (MY3A)
Without stroke adjusting unit (MY3B)
16 25 40
80 to 500 mm/s
80 to 1000 mm/s80 to 1000 mm/s
80 to 1500 mm/s
63
Stroke adjusting unit (L and H unit/MY3B)
∗ External shock absorber (low reaction type)
∗ Refer to “External Shock Absorber Selection” on page 8.When Series RB is used, operate at a piston speed that will not exceed the absorption capacity of the air cushion and stroke adjusting unit.
∗ Strokes are manufacturable in 1mm increments, up to the maximum stroke. However, when exceeding a 2000 mm stroke, specify “-XB11” at the end of the model number. Refer to the made to order specifications on page 27.
Note) The tolerance of MY3A is a value with no pressurization. When a rubber bumper is used, the stroke of MY3A varies according to the operating pressure.To find the stroke length tolerance at each operating pressure, double the addi-tional stroke due to pressure on each side (page 6) and add it.
0 to –10 0 to –12 0 to –16 0 to –16
(ø16L unit: 80 to 800 mm/s)
Mechanically Jointed Rodless Cylinder Series MY3A/3B
1000 mm or less , Note)1001 mm to +1.8 0
+2.8 0
L unit
H unit
LeftRightLeft
Right
MY3B
16 25
MY3B-A16L1MY3B-A16L2MY3B-A16H1MY3B-A16H2
MY3B-A25L1MY3B-A25L2MY3B-A25H1MY3B-A25H2
MY3B-A40L1MY3B-A40L2MY3B-A40H1MY3B-A40H2
MY3B-A63L1MY3B-A63L2MY3B-A63H1MY3B-A63H2
40 63
Stroke Adjusting Unit ModelOption
Bore size(mm)UnitModel
MY3B
MY3A
MY3A_3B.qxd 03.5.14 2:47 PM Page 15
MY3A16-16A- Stroke
MY3A16-16B- Stroke
RMA-16RMY-16
MYA16-15-R6656
ø6.2 × ø3 × ø1.6
MY3A25-16A- Stroke
MY3A25-16B- Stroke
RMA-25RMY-25
MYA25-15-R6657
C-5
MY3A40-16A- Stroke
MY3A40-16B- Stroke
RMA-40RMY-40
MYA40-15-R6658
ø10.5 × ø8.5 × ø1
MY3A63-16A- Stroke
MY3A63-16B- Stroke
RMA-63RMY-63
MYA63-15-R6659
C-14
13
Series MY3A/3B
Construction
MY3A
Seal ListNo. No.
Seal belt
Dust seal band
Gasket bumperPiston seal
Scraper
O-ring
No.Specialresin
Stainlesssteel
NBRNBR
Specialresin
NBR
No.
No.12131417192021222425
DescriptionSpring pinSeal ringBearingInner wiperHexagon socket head cap screwHexagon socket head cap screwHexagon socket head set screwHexagon socket head taper plugMagnetSeal magnet
Mechanically Jointed Rodless Cylinder Series MY3A/3B
MY3B16-16A- Stroke
MY3B16-16B- Stroke
RMB-16RMY-16
MYA16-15-R6656
ø6.2 × ø3 × ø1.6ø4 × ø1.8 × ø1.1
MCS-3
MY3B25-16A- Stroke
MY3B25-16B- Stroke
RMB-25RMY-25
MYA25-15-R6657
C-5ø4 × ø1.8 × ø1.1
MCS-5
MY3B40-16A- Stroke
MY3B40-16B- Stroke
RMB-40RMY-40
MYA40-15-R6658
ø10.5 × ø8.5 × ø1ø7.15 × ø3.75 × ø1.7
RCS-8
MY3B63-16A- Stroke
MY3B63-16B- Stroke
RMB-63RMY-63
MYA63-15-R6659
C-14ø8.3 × ø4.5 × ø1.9
RCS-12
Seal ListNo. No.
Seal belt
Dust seal band
Tube gasketPiston seal
Scraper
O-ringO-ringCushion seal
No.Specialresin
Stainlesssteel
NBRNBR
Specialresin
NBRNBRNBR
No.
No.1314171920212224252627
DescriptionCushion bossBearingInner wiperHexagon socket head cap screwHexagon socket head cap screwHexagon socket head set screwHexagon socket head taper plugMagnetSeal magnetCushion ringCushion needle
For long stroke operation, the cylinder tube may be deflected depending on its own weight and the load weight. In such a case, use a side support in the middle section. The spacing (l ) of the support must be no more than the values shown in the graph on the right.
q If the cylinder mounting surfaces are not measured accurately, using a side support may cause poor operation. Therefore, be sure to level the cylinder tube when mounting. Also, for long stroke operation involving vibration and impact, use of a side support is recommended even if the spacing value is within the allowable limits shown in the graph.
w Support brackets are not for mounting; use them solely for providing support.
Guide for using MY3B side supportGuide for using MY3A side support
Support spacing l1 (mm)
MY3A16
MY3A25
MY
3A40
MY
3A63
(1000)
(1100)
(1400)
(1900)
Note) A side support must be used to keep the spacing from exceeding the value inside the parentheses.
Support spacing l1 (mm)Note) A side support must be used to keep
the spacing from exceeding the value inside the parentheses.
Wei
ght w
(kg
)
0
100
90
80
70
60
50
40
30
20
10
40003000200010000
MY3B16
MY3B25
MY
3B40
MY
3B63
(900)
(1000)
(1300)
(1800)
0
Wei
ght w
(kg
)
100
90
80
70
60
50
40
30
20
10
40003000200010000
E
BAC
D
DC
BA
2-øH
E
F
2-øG
2-J
Mechanically Jointed Rodless Cylinder Series MY3A/3B
l
l
l l
(mm)
MY3A_3B.qxd 03.5.14 2:47 PM Page 21
Series MY3A/3B
19
Floating Bracket
Facilitates connection to other guide systems.
Applications
Mounting example
Applications
Mounting example
MYAJ16MYAJ25MYAJ40MYAJ63
MY316MY325MY340MY363
385572
100
20223240
M4 × 0.7M6 ×1M8 ×1.25M10 ×1.5
4.55.56.59.0
10121619
6.09.5
11.014.0
Installation of holding bolts
Model
MYAJ16Tighting torque
Tighting torque for holding bolts
MYAJ635
13
Model
MYAJ40Tighting torqueUnit: N • m
Slider(piston yoke)
Pin Conical springwasher
Holding bolt
MYAJ251.53
Guide
Mounting orientation w (to minimize the installation height)Work
BracketFloating mechanism
Series MY3A
Mounting orientation q (to minimize the installation width)Work
BracketFloating mechanism
Series MY3AGuideE
aE
a
H Q1
F1
B1
C1
GD1 Za1
Ea
Ea
P Q2
F2
B2
C2
GD2 Za2
Detaildrawing of Za2
(adjustablerange)
Detaildrawing of Za1
(adjustablerange)
Eb
Eb
2 × 2-øLD
A1
PK1
(scr
ew le
ngth
)L
(C
ount
erbo
re
dep
th)
Zb1JJ
Detaildrawing of Zb1
(adjustablerange)
Eb
Eb
2 × 2-øLDH
L (
Cou
nter
bore
d
epth
)K
2 (s
crew
leng
th)
A2
Zb2JJ
Detaildrawing of Zb2
(adjustablerange)
ApplicablecylinderModel
Common
JJ L P LDHG
MYAJ16MYAJ25MYAJ40MYAJ63
MY316MY325MY340MY363
29.038.556.086
6890
130186
34456593
18243250
88112162226
5.56.59.5
10.0
ApplicablecylinderModel
Mounting direction q
C1 D1 F1 K1
10111620
Q1B1A1
MYAJ16MYAJ25MYAJ40MYAJ63
MY316MY325MY340MY363
364668
100
5880
114166
29405783
30405580
6892
130185
10141923
5689.5
1111
1111
ApplicablecylinderModel
Mounting direction w
Adjusting range
C2 D2 F2 K2 Q2
Ea Eb
B2A2
MY3 floating bracket mounting dimensions (mm)
MY3A_3B.qxd 03.5.14 2:47 PM Page 22
BMY3-016
20
Auto Switches Proper Mounting Positionfor Stroke End Detection
Auto Switch Mounting
088.5
121.7
197.5
266.5
22.0
29.3
42.5
53.5
06.5
10.5
15
14
A B Operating rangeBore size
16254063
D-A9, D-A9V (mm)
084.5
117.7
193.5
262.5
26.5
33.3
46.5
57.5
3.0
4.5
6.3
6.6
A B Operating rangeBore size
16254063
D-F9W, D-F9(W)V (mm)
094.5
135.7
215.5
284.5
28.5
43.3
60.5
71.5
06.5
10.5
15
14
A B Operating rangeBore size
16254063
D-A9, D-A9V (mm)
090.5
131
211.5
280.5
32.5
47.3
64.5
75.5
A B Operating rangeBore size
16254063
D-F9W, D-F9(W)V (mm)
3.0
4.5
6.3
6.6
084.5
117.7
193.5
262.5
2
3
4
4.5
2
3
4
4.5
B Operating rangeBore size
16254063
D-M9 (mm)
090.5
131
211.5
280.5
B Operating rangeBore size
16254063
D-M9 (mm)
MY3A
MY3B
AccessoriesFlat head watchmakers screw driver
(M2.5 × 41)Switch mounting screw
Switch spacer(BMY3-016)
A B
When mounting an auto switch, first hold the switch spacer with your fingers and push it into the groove. Confirm that it is aligned evenly within the groove and adjust the position if necessary (see below). Then, insert the auto switch into the groove and slide it into the spacer (refer to the drawing at right).After deciding on the mounting position within the groove, slip in the mounting screw, which is included, and tighten it, using a flathead watchmakers screw driver.
Note) Use a watchmakers screw driver with a handle diameter of 5 to 6 mm to fasten the auto switch mounting screws.The tightening torque should be approximately 0.05 to 0.1 N•m.The guideline is a 90° rota-tion after the fastening is felt.
16 25 40 63Applicable bore size (mm)
Switch spacer
Switch spacer (mm)
Besides the models listed in “How to Order”, the following auto switches are applicable.Refer to page 23 for details.
The normally closed type (NC=b contact) solid state switches (D-F9G, F9H) are also available. For detailed information, please consult SMC.
Auto switch type Part no. Features
Withoutindicator light
Lead wire electricalentry
D-A90Reed switch
Grommet (in-line)D-A90V Grommet (vertical)
26.5
33.3
46.5
57.5
A
32.5
47.3
64.5
75.5
A
Mechanically Jointed Rodless Cylinder Series MY3A/3B
Note) The operating ranges are provided as guidelines including the hystere-sis and are not guaranteed values (with approx. ±30% variations). They may vary significantly with the surrounding environment.
MY3A_3B.qxd 03.5.14 2:47 PM Page 23
21
Auto Switch SpecificationsSeries MY3A/3B
Auto Switch Specifications
TypeLeakage current
Operating time
Impact resistance
Insulation resistance
Withstand voltage
Ambient temperature
Enclosure
Reed auto switch
None
1.2 ms
300 m/s2
50 MΩ or more at 500 VDC (between lead wire and case)
–10 to 60°CIEC529 standard IP67, watertight (JISC0920)
Solid state switch
2-wire: 100 µA or less, 2-wire: 0.8 mA or less
1 ms or less
1000 m/s2
1500 VAC for 1 min.(between lead wire and case)
1000 VAC for 1 min.(between lead wire and case)
Lead Wire Length
Lead wire length indication
(Example)
0.5 m3 mL5 mZ
Note 1) Lead wire length Z: 5 m applicable auto switchesSolid state switch: All types are produced upon receipt of order.
Note 2) For solid state switches with flexible wire specification, add “–61” at the end of the lead wire length.
NilLead wire length
LD-F9P
Flexible specification
D-F9PL- 61
Contact Protection Box/CD-P11, CD-P12
<Applicable switch type>
Contact Protection Box Specifications
Contact protection box internal circuits
Contact protection box dimensions
Contact Protection Box/Connection
∗ Lead wire length Switch connection side: 0.5 m Load connection side: 0.5 m
D-A9 and D-A9V type switches do not have internal contact protection circuits.q The operated load is an induction load.w The length of wiring to the load is 5 m or more.e The load voltage is 100 VAC and 200 VAC.
A contact protection box should be used in any of the above situations.
Part No. CD-P11
CD-P11
100 VAC
25 mA
200 VAC
12.5 mA
CD-P12
24 VDC
50 mA
CD-P12
Surge absorberChokecoil
OUT Brown [Red]
OUT Blue [Black]
OUT (+)Brown [Red]
OUT (-)Blue [Black]
Choke coil
Zener diode
(Example)
Load voltage
Max. load current
To connect a switch unit to a contact protection box, connect the lead wire from the side of the contact protection box marked SWITCH to the lead wire coming out of the switch unit. The switch unit should be kept as close as possible to the contact protection box with a lead wire that is no more than 1 meter in length.
MY3A_3B.qxd 03.5.14 2:47 PM Page 24
22
Basic Wiring
Solid state 3-wire, NPN
• Sink input specifications3-wire, NPN
3-wire (using relays)
2-wire(Solid state)
• Source input specifications3-wire, NPN
OR connection for NPN output
2-wire with 2-switch AND connection 2-wire with 2-switch OR connection
2-wire 2-wire
Solid state 3-wire, NPN
Load voltage at ON = Power supply voltage – Internal voltage drop × 2 pcs.
= 24 V–4 V × 2 pcs.= 16 V
Example: Power supply is 24 VDCInternal voltage drop in switch is 4 V.
Load voltage at OFF = Leakage current × 2 pcs. × Load impedance
= 1 mA × 2 × 3 kΩ= 6 V
Example: Load impedance is 3 kΩ.Leakage current from switch is 1 mA.
(Power supplies for switch and load are separate)
Switch 1
Switch 2
LoadSwitch 1
Brown [Red]
Switch 2
Black[White]
Blue [Black]
Black[White]
Blue [Black]
Blue [Black]
Blue [Black]
Relay
Relay
Brown [Red]
Load
Relaycontact
Switch 1
Switch 2
Brown[Red]
Blue[Black]
Brown[Red]
Blue [Black]
LoadSwitch 1
Switch 2
Brown[Red]
Blue [Black]
Brown [Red]
Blue [Black]
Load
Switchmaincircuit
Brown [Red]
Black [White]
Blue [Black]
Load
Switchmaincircuit
Brown
Black [White]
Blue [Black]
Load
Switchmaincircuit
Brown [Red]
Black [White]
Blue [Black]
Load
Switchmaincircuit
Brown [Red]
Blue [Black]
Load
Switchmaincircuit
Brown [Red]
Blue [Black]Load
Switch
InputBlack [White]
COM
Brown [Red]
Blue [Black]
Switch
Input
Blue[Black]
COM
Brown [Red]
Switch
InputBlack [White]
PLC internal circuitCOM
Brown [Red]
Blue [Black]
PLC internal circuit
PLC internal circuit
PLC internal circuit
Switch
InputBlue [Black]
COMBrown [Red]
Connection Examples for AND (Series) and OR (Parallel)
Examples of Connection to PLC (Programable Logic Controller)
2-wire(Reed switch)
Indicatorlightprotectivecircuit,etc.
Brown [Red]
Blue [Black]
Load
Brown [Red]
Blue [Black]Load
Switch 1
Brown [Red]
Switch 2
Black [White]
Load
Brown [Red]
Black [White]
Blue [Black]
Blue [Black]
Brown [Red]
Black [White]
Brown [Red]
Black [White]
AND connection for NPN output(performed with switches only)
AND connection for NPN output(using relays)
The indicator light illuminates when the two switches are in the ON state.
< Solid State> < Reed Switch>When two switches are connected in series, a load may malfunction because the load vol-tage will decline when in the ON state. The indi-cator lights will light when both switches are in the ON state.
When two switches are connected in par-allel, malfunction may occur because the load voltage will in-crease when in the OFF state.
Because there is no current leakage, the load voltage will not in-crease when turned OFF However, depend-ing on the number of switches in the ON state, the indicator lights may sometimes grow dim or not light up be-cause of the dispersion and reduction of the current flowing to the switches.
Auto Switch Connections and Examples
Indicatorlightprotectivecircuit,etc.
Connect according to the applicable PLC input specifications, as the connection method will vary depending on the PLC input specifications.
MY3A_3B.qxd 03.5.14 2:47 PM Page 25
The dimension inside ( ) is for D-A93.D-A90V, D-A93V, D-A96V
Reed Switches: Direct Mounting TypeD-A90(V), D-A93(V), D-A96(V)
Lead wiresOilproof vinyl heavy insulation cable, ø2.7, 0.5 mD-A90(V), D-A93(V) 0.18 mm2 × 2 cores (Brown, Blue [Red, Black]) D-A96(V) 0.15 mm2 × 3 cores (Brown, Black, Blue [Red, White, Black])
Note 1) Refer to page 21 for auto switch common specifications.Note 2) Refer to page 21 for lead wire lengths.
D-A90, D-A90V
IC circuit, Relay, PLC
24 V or less
50 mA
None
1 Ω or less (including lead wire length of 3 m)
48 V or less
40 mA
100 V or less
20 mA
D-A93, D-A93V
Relay, PLC
24 VDC
5 to 40 mA
NoneD-A93 — 2.4 V or less (to 20 mA)/
3 V or less (to 40 mA) D-A93V — 2.7 V or less
Red LED lights up when ON
100 VAC
5 to 20 mA
D-A96, D-A96V
IC
4 to 8 VDC
20 mA
0.8 V or less
ACDC
ACDC
ACDC
Note) 1. In the case operation load is an inductive load.
2. In the case the wiring length to load is more than 5 m.
3. In the case the load voltage is 100 VAC.A contact protection box should be used if any of the above conditions is applicable. (For detailed in-formation about the contact protection box, please refer to page 21.)
q Do not use anything other than the mounting screws attached to the auto switch body to secure the switch. If screws other than those specified are used, it may cause the switch to be dam-aged.
Operating Precautions Caution
Model D-A90
6
30
D-A90V
6
30
D-A93
6
30
D-A93V
6
30
D-A96
8
41
D-A96V
8
41
Unit: g
Auto Switch Weight
Auto switch internal circuits
D-A90(V)
D-A93(V)
D-A96(V)
Contactprotectionbox
CD-P11CD-P12
OUT (±)Brown [Red]
OUT (±)Blue [Black]
Blue [Black]
LED
Resistor
Zenerdiode
Brown [Red] (+)
Contactprotectionbox
CD-P11CD-P12
OUT (+)Brown[Red]
OUT (-)Blue[Black]
LED
Resistor
Reversecurrentpreventiondiode
OUTBlack [White]
DC (+)Brown [Red]
DC (-)Blue [Black]
(+)
(-)
Auto Switch DimensionsD-A90, D-A93, D-A96
23
Auto Switch Specification
Ree
d sw
itch
Lead
sw
itch
Load
Auto switch part no.
Applicable load
Load voltage
Maximum load current
Contact protection circuit
Internal resistance
Auto switch part no.
Applicable load
Load voltage
Contact protection circuit
Indicator light
Load current range and max. load current
Internal voltage drop
M2.5 × 4 lSlotted set screw
M2.5 × 4 l Slotted set screw
Indicator lightType D-A90 without indicator light
Indicator light
Type D-A90V without indicator light
Most sensitive position10
Most sensitive position10
22(24.5)
222 6
ø2.7
9.1
5.1
4.5
ø4
ø4
4.5
ø2.
7
22.8
Ree
d sw
itch
Ree
d sw
itch
0.5
3
Lead wire length(m)
MY3A_3B.qxd 03.5.14 2:47 PM Page 26
24
Solid State Switches: Direct Mounting TypeSeries D-M9N, D-M9P, D-M9B
Operating Precautions Caution
Auto Switch Specifications
Auto Switch Weight
Auto Switch Dimensions
Model
0.5
3
D-M9N
8
41
D-M9P
8
41
D-M9B
7
38
Unit: g
Lead wire length(m)
PLC: Programable Logic Controller
Auto switch part no.
Wiring type
Output type
Applicable load
Power supply voltage
Current consumption
Load voltage
Load current
Internal voltage drop
Leakage current
Indicator light
D-M9N D-M9B2-wire
—
24 VDC Relay, PLC
—
—
24 VDC (10 to 28 VDC)
2.5 to 40 mA
4 V or less
0.8 mA or less
D-M9P
D-M9Mounting screw M2.5 × 4 lSlotted set screw
Indicator light
3-wire
IC circuit, Relay, PLC
5, 12, 24 VDC (4.5 to 28 VDC)
10 mA or less
40 mA or less
0.8 V or less
100 µA or less at 24 VDC
NPN PNP
Red LED lights up when ON
28 VDC —
2.7
22
22
22
2.6
4 2.8
D-M9B, N, P
3.2
6
D-M9N, P (3-wire)
Most sensitive position
3.2
6
D-M9B (2-wire)
Most sensitive position
D-M9 (With indicator light)
Lead wiresOilproof vinyl heavy insulation cable, ø2.7, 0.5 mD-M9B 0.15 mm2 × 2 coresD-M9N, D-M9P 0.15 mm2 × 3 cores
Note 1) Refer to page 21 for auto switch common specifications.Note 2) Refer to page 21 for lead wire lengths.
Auto switch internal circuitsD-M9N
D-M9B
D-M9P
Grommet 2-wire load current is reduced (2.5 to 40 mA). Lead-free Use of lead wire compliant with UL
standards (style 2844) 1.5 times the flexibility compared with
conventional products (comparison with other SMC products)
Conventional
D-M9
Sw
itch
mai
n ci
rcui
tS
witc
hm
ain
circ
uit
Sw
itch
mai
n ci
rcui
t
DC (+)Brown [Red]
OUTBlack [White]
DC (-)Blue [Black]
DC (+)Brown [Red]
OUTBlack [White]
DC (-)Blue [Black]
OUT (+)Brown [Red]
OUT (-)Blue [Black]
When the cable sheath is stripped, confirm the stripping direction.The insulator may be split or damaged depending on the direction.
MY3A_3B.qxd 03.5.14 2:47 PM Page 27
25
Auto switch internal circuits
D-F9NV
D-F9BV
D-F9PV
Auto Switch Specifications
Auto Switch Weight
Auto Switch Dimensions
Model
0.5
3
5
D-F9NV 7
37
61
D-F9PV 7
37
61
D-F9BV 6
31
51
Unit: g
Solid State Switches: Direct Mount TypeD-F9NV, D-F9PV, D-F9BV
Lead wire length(m)
Grommet
Operating Precautions Caution
Do not use anything other than the mount-ing screws attached to the auto switch body to secure the switch. If screws other than those specified are used, it may cause the switch to be damaged.
PLC: Programable Logic Controller
D-F9, D-F9V (With indicator light)Auto switch part no.
Electrical entry direction
Wiring type
Output type
Applicable load
Power supply voltage
Current consumption
Load voltage
Load current
Internal voltage drop
Leakage current
Indicator light
NPN
28 VDC or less
40 mA or less
D-F9NV
Perpendicular
D-F9BV
Perpendicular
D-F9PV
Perpendicular
2-wire
—
24 VDC relay, PLC
—
—
24 VDC (10 to 28 VDC)
5 to 40 mA
4 V or less
0.8 mA or less
PNP
—
80 mA or less
Lead wiresOilproof vinyl heavy insulation cable, ø2.7, 0.5 m0.15 mm2 × 3 cores (Brown, Black, Blue [Red, White, Black]) 0.18 mm2 × 2 cores (Brown, Blue [Red, Black])
Note 1) Refer to page 21 for auto switch common specifications.Note 2) Refer to page 21 for lead wire lengths.
1.5 V or less(0.8 V or less at
10 mA load current)
Red LED lights up when ON
OUTBlack[White]
DC (+)Brown[Red]
DC (-)Blue[Black]
Switc
hm
ain
circu
it
DC (+)Brown[Red]
DC (-)Blue[Black]
OUTBlack[White]
OUT (+)Brown[Red]
OUT (-)Blue[Black]
D-F9V
4
2
3.8
3.1
6
4.3
20
6.2
4.6
2.8ø2.7
Slotted set screw
Indicator light
Most sensitive position
0.8 V or less
IC circuit, Relay, PLC
5, 12, 24 VDC (4.5 to 28 VDC)
10 mA or less
100 µA or less at 24 VDC
3-wire
Mounting screw M2.5 × 4 l
Switc
hm
ain
circu
itSw
itch
mai
n cir
cuit
MY3A_3B.qxd 03.5.14 2:47 PM Page 28
26
Auto switch internal circuits
D-F9NW, F9NWV
D-F9BW, F9BWV
D-F9PW, F9PWV
Auto Switch Specifications
Auto Switch Dimensions
Solid State Switches with 2-Color Display: Direct Mount TypeD-F9NW(V), D-F9PW(V), D-F9BW(V)
Grommet PLC: Programable Logic Controller
D-F9W, D-F9WV (With indicator light)Auto switch part no.
Wiring type
Output type
Applicable load
Power supply voltage
Current consumption
Load voltage
Load current
Internal voltage drop
Leakage current
Indicator light
D-F9NW
In-line
D-F9NWV
Perpendicular
D-F9PW
In-line
D-F9PWV
Perpendicular
D-F9BW
In-line
D-F9BWV
Perpendicular
3-wire
IC circuit, Relay IC, PLC
5, 12, 24 VDC (4.5 to 28 VDC)
10 mA or less
100 µA or less at 24 VDC
NPN
28 VDC or less
40 mA or less
2-wire
—
24 VDC relay, PLC
—
—
24 VDC (10 to 28 VDC)
5 to 40 mA
4 V or less
0.8 mA or less
—
80 mA or less
0.8 V or less
PNP
Lead wiresOilproof vinyl heavy insulation cable, ø2.7, 0.5 m0.15 mm2 × 3 cores (Brown, Black, Blue [Red, White, Black]) 0.18 mm2 × 2 cores (Brown, Blue [Red, Black])
Note 1) Refer to page 21 for auto switch common specifications.Note 2) Refer to page 21 for lead wire lengths.
Actuated position ..... Red LED lights upOptimum operating position ..... Green LED lights up
1.5 V or less (0.8 V or less at10 mA load current
2
2.8 22
ø2.
7Indicator light
2.6
4
Most sensitive position6
Slotted set screw
Indicator light
4.3
2
3.8
3.16.2 4
ø2.7
Most sensitive position6
4.6
2.8 20
OUTBlack [White]
DC (+)Brown [Red]
DC (-)Blue [Black]
DC (+)Brown[Red]
OUTBlack[White]
DC (-)Blue[Black]
OUT (+)Brown[Red]
OUT (-)Blue[Black]
D-F9WV
D-F9W
Indicator light
Auto Switch Weight
Model
0.5
3
5
D-F9NW(V) 7
34
56
D-F9PW(V) 7
34
56
D-F9BW(V) 7
32
52
Unit: g
Lead wire length(m)
Mounting screw M2.5 × 4 lSlotted set screw
Mounting screw M2.5 × 4 l
Switc
hm
ain
circu
itSw
itch
mai
n cir
cuit
Switc
hm
ain
circu
it
Electrical entry direction
Operatingrange
ON
DisplayRed Green Red
OFF
Most sensitive position
MY3A_3B.qxd 03.5.14 2:47 PM Page 29
27
Series MY3A/3B
Contact SMC for detailed dimensions, specifications and lead times.Made to Order Specfications q
Made to Order Application List
Basic short type
1 Long Stroke
Stroke range: 2001 to 3000 mm
Example) MY3A40-2700-F9B-XB11
MY3 A
MY3AMY3B
Basic short type
Basic standard type
Longstroke
Helicalinsert threads
Holdermounting bracket
XB11
Series/Bore size
Bore size Stroke Auto switch Symbol
ABasic standard typeB
-XB11
16 25 40 63
Made to
Order
Available with long strokes exceeding the standard strokes.The stroke can be set in 1 mm increments.
2 Helical Insert Thread Specification
Example) MY3B16-300L-F9B-X168
-X168
MY3 B X168
Series/Bore sizeAB
Basic short typeBasic standard type
16 25 40 63
The mounting threads of the slider are changed to helical insert threads. The thread size is the same as standard.
3 Holder Mounting Bracket ………………………Holder mounting brackets are used to fasten the stroke adjusting unit at an intermediate stroke position.
Fine Stroke Adjustment Range(Treated as a special order when exceeding the adjustment ranges shown below.) Unit: mm
XB11 X168 X416, X417
Bore size Stroke Auto switch Symbol
Spacer
Length (l)
Spacer
Length (l)
Slider (Slide table)Stroke adjusting unit
Head cover
l (X417)
l (X416)
Stroke adjusting unit
Holder mounting bracket
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28
Series/Bore size
StrokeNote) Indicates the stroke prior to mounting the stroke adjusting unit.
Refer to the table below for applicable symbols.
Refer to the table below for applicable symbols.
Refer to the table below for applicable symbols.
B16 25 40 63
MY3 B Bore size 300 L X416
Stroke adjusting unit
Holder mounting bracket
Combination symbol
NilWZLHLZHZNilWLH
L, H, LS, SL, HS, SH
L, H
LH, HL
L, H, LS, SL, HS, SHL, H
LH, HL
X416 on one side ∗ Note 2)X416 on both sidesX416 on one side, X417 on the other side ∗ Note 2)X416 on L unit sideX416 on H unit sideX416 on L unit side, X417 on the other sideX416 on H unit side, X417 on the other sideX417 on one side ∗ Note 2)X417 on both sidesX417 on L unit sideX417 on H unit side
Stroke adjusting unit SymbolMounting pcs.
Combination descriptionHolder
mountingbracket
Note 1) For LS, SL, HS and SH, the stroke adjusting unit is mounted on one side only.Note 2) The stroke adjusting unit is installed on the left side (or right side in case of SL and SH) at the time of shipment. It can however be moved to the right side (or left side).
X416
X417
X416 X417
L units with one each of X416 and X417
MY3B25-300L-X416Z
L and H units, where X417 is mounted on L unit only and nothing on H unit
MY3B25-300LH-X417L Note) The holder mounting bracket can be commonly used on the L and H units as well as the left and right sides.
L unit
L unit
L unit
H unit
X416
X417
X417
Note) Refer to the options table of "How to Order" for each series.
How to order single pieces of stroke adjusting unit
Contact SMC for detailed dimensions, specifications and lead times.Made to Order Specfications w Made to
Order
–60–50–40–30–20–10
L unitH unit
L unitH unit
L unitH unit
L unitH unit
MY3B stroke adjustment range0
-X417
-X417
-X417
-X416
-X416
-X416
Standard
Standard
Standard
-X417-X416Standard
32 to 4816 to 32
32 to 4816 to 32
0 to 16
0 to 16
24 to 3612 to 240 to 12
20 to 3010 to 200 to 10
MY3B25
MY3B40
MY3B63
MY3B16
MY3A_3B.qxd 03.5.14 2:47 PM Page 31
29
Safety InstructionsSeries MY3A/3B
Note 1) ISO 4414: Pneumatic fluid power -- General rules relating to systems
Note 2) JIS B 8370: Pneumatic system axiom
Warning
Caution : Operator error could result in injury or equipment damage.
Warning : Operator error could result in serious injury or loss of life.
Danger : In extreme conditions, there is a possible result of serious injury or loss of life.
These safety instructions are intended to prevent a hazardous situation and/or equipment damage. These instructions indicate the level of potential hazard by a label of "Caution", "Warning" or "Danger". To ensure safety, be sure to observe ISO 4414 Note 1), JIS B 8370 Note 2) and other safety practices.
1. The compatibility of pneumatic equipment is the responsibility of the person who designs the pneumatic system or decides its specifications.Since the products specified here are used in various operating conditions, their compatibility for the specific pneumatic system must be based on specifications or after analysis and/or tests to meet your specific requirements. The expected performance and safety assurance will be the responsibility of the person who has determined the compatibility of the system. This person should continuously review the suitability of all items specified, referring to the latest catalog information with a view to giving due consideration to any possibility of equipment failure when configuring a system.
2. Only trained personnel should operate pneumatically operated machinery and equipment.Compressed air can be dangerous if handled incorrectly. Assembly, handling or repair of pneumatic systems should be performed by trained and experienced operators.
3. Do not service machinery/equipment or attempt to remove components until safety is confirmed.
1. Inspection and maintenance of machinery/equipment should only be performed after confirmation of safe locked-out control positions.
2. When equipment is to be removed, confirm the safety process as mentioned above. Cut the supply pressure for this equipment and exhaust all residual compressed air in the system.
3. Before machinery/equipment is restarted, take measures to prevent shooting-out, etc.
4. Contact SMC if the product is to be used in any of the following conditions:1. Conditions and environments beyond the given specifications, or if product is used outdoors.2. Installation on equipment in conjunction with atomic energy, railway, air navigation, vehicles, medical
equipment, food and beverages, recreation equipment, emergency stop circuits, clutch and brake circuit in press applications, or safety equipment.
3. An application which has the possibility of having negative effects on people, property, or animals, requiring special safety analysis.
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30
Actuator Precautions 1Be sure to read before handling.
1. There is a danger of sudden action by air cy-linders if sliding parts of machinery are twis-ted, etc., and changes in forces occur. In such cases, bodily injury may occur, e.g., by having hands or get in the machinery, or damage to the machinery itself may occur. Therefore, the machine should be designed to prevent such dangers.
2. A protective cover is recommended to mini-mize the risk of personal injury.If a driven object and moving parts of a cylinder pose a dan-ger of personal injury, design the structure to avoid contact with the human body.
3. Securely tighten all staitionary parts and con-nected parts so that they will not become loose.Particularly when a cylinder operates with high frequency or is installed where there is a lot of vibration, ensure that all parts remain secure.
4. A deceleration circuit or shock absorber may be required.When a driven object is operated at high speed or the load is heavy, a cylinder’s cushion will not be sufficient to absorb the impact. Install a deceleration circuit to reduce the speed be-fore cushioning, or install an external shock absorber to re-lieve the impact. In cases such as these, the rigidity of the ma-chinery should also be examined.
5. Consider a possible drop in operating pres-sure due to a power outage, etc.When a cylinder is used as part of a clamping mechanism, there is a danger of work pieces dropping if there is a de-crease in clamping force due to a drop in circuit pressure caused by a power outage, etc. Therefore, safety equipment should be installed to prevent human injury or damage to ma-chinery. Suspension mechanisms and lifting devices also re-quire for drop prevention measures.
6. Consider a possible loss of power source.Measures should be taken to protect against human injury and equipment damage in the event that there is a loss of power to equipment controlled by pneumatics, electricity or hydraulics, etc.
7. Design circuitry to prevent sudden lurching of driven objects. Take special care when a cylinder is driven by an exhaust center type directional control valve or when starting up after residual pressure is exhausted from the circuit, etc. The piston and its driven object will lurch at high speed if pressure is ap-plied to one side of the cylinder because of the absence of air pressure inside the cylinder. Therefore, equipment should be selected and circuits designed to prevent sudden lurching be-cause there is a danger of human injury particularly to limbs, and/or damage to equipment when this occurs.
8. Consider emergency stops.Design the system so that human injury and/or damage to ma-chinery and equipment will not be caused when machinery is stopped by a safety device responding to abnormal conditions such as a power outage or a manual emergency stop.
9. Consider the action when operation is restar-ted after an emergency stop or abnormal stop.Design the machinery so that human injury or equipment dam-age will not occur upon restart of operation. When the cylinder has to be reset at the starting position, install safe manual control equipment.
Design
Warning
1. Confirm the specifications.The products featured in this catalog are designed for use in industrial compressed air systems. If the products are used in conditions where pressure and/or temperature are out of the range of specifications, damage and/or malfunction may oc-cur. Do not use in these conditions. (Refer to specifications.)Consult SMC if fluid other than compressed air is required.
2. Intermediate stopsWhen intermediate stopping of a cylinder piston is performed with a 3-position closed center type directional control valve, it is difficult to achieve stopping positions as accurate and precise as with hydraulic pressure due to the compressibility of air.Furthermore, since valves and cylinders are not guaranteed for zero air leakage, it may not be possible to hold a stopped posi-tion for an extended period of time. Contact SMC in case it is necessary to hold a stopped position for an extended period.
Selection
1. Operate within the limits of the maximum usable stroke.Refer to the air cylinder model selection procedure for the maximum useable stroke.
2. Operate the piston in such a way that colli-sion damage will not occur at the stroke end.Operate within such a range such that will prevent damage from occuring when a piston, having inertial force, stops by striking the cover at the stroke end. Refer to the cylinder mod-el selection procedure for the maximum usable stroke.
3. Use a speed controller to adjust the cylinder drive speed, gradually increasing from a low speed to the desired speed setting.
4. Provide intermediate supports for long stroke cylinders.Provide intermediate supports for cylinders with long strokes to prevent rod damage due to sagging of the rod, deflection of the tube, vibration and external loads.For detailed information, please refer to "Guide for Using Side Supports" on page 18.
Caution
Warning
Series MY3A/3B
∗ The external shock absorber should conform to the conditions on page 8. Use caution because the use of a shock absorber falling short of the recommended conditions may damage the cylinder.
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31
Actuator Precautions 2Be sure to read before handling.
Series MY3A/3B
1. Do not apply strong impacts or excessive moment to the slide table (slider).Do not apply strong impact or excessive moment in mounting the work piece because the slide table (slider) is supported by resin bearings.
2. Align carefully when connecting to a load having an external guide mechanism.A mechanically jointed rodless cylinder can be used with a di-rect load within the allowable range for each guide type, how-ever, careful alignment is required when connecting to a load having an external guide mechanism. The longer the stroke, the larger the deflection of the axis centre becomes. There-fore, adopt an appropriate connection method (floating mecha-nism) to absorb the difference. For Series MY3A and MY3B, dedicated floating mechanism brackets are available (page 9).
3. Do not scratch or gouge the cylinder tube by striking or grasping it with other objects.Cylinder shape is manufactured to precise tolerances, so that even a slight deformation may cause faulty operation.
4. Do not use until you can verify that equip-ment can operate properly.Following mounting repairs, or conversions, verify correct mounting by conducting suitable function and leakage tests after piping and power connections have been made.
5. Instruction manualThe product should be mounted and operated after thorough-ly reading the manual and understanding its contents.Keep the instruction manual where it can be referred to as needed.
6. At each end of the cylinder, secure a mount-ing surface with a 5 mm or longer area that contacts the lower side of the cylinder.
MountingMounting
Caution1. Preparation before piping
Before piping is connected, it should be thoroughly blown out with air (flushing) or washed to remove chips, cutting oil, and other debris from inside the pipe.
2. Wrapping of sealant tapeWhen screwing together pipes and fittings, etc., be certain that chips from the pipe threads and sealing material do not get in-side the piping.Also, when sealant tape is used, leave 1.5 to 2 thread ridges exposed at the end of the threads.
Piping
Caution
7. If the cylinder is mounted on the ceiling or wall under the condition where high load factors or impacts are expected, use side supports, in addition to the fixing bolts on the head cover, to support both ends of the cylinder tube.
Wrapping direction
Sealant tapeExpose approx. 2 threads
5 mm or more5 mm or more
Side support
Side support
1. Readjust using the cushion needle.Cushion needles are adjusted at the time of shipment. When the cylinder is put into service, the cushion needles should be readjusted based on factors such as the size of the load and the operating speed. When the cushion needles are turned clockwise, restriction of the air flow becomes greater and thus the cushioning effect also increases.
2. Do not operate with the cushion needles fully closed.It may damage the seals.
Cushion (MY3B)Cushion (MY3B)
HandlingHandling
Caution
1. Lubrication of non-lube type cylinderThe cylinder is lubricated for life at the factory and can be used without any further lubrication.However, in the event that it is lubricated additionally, be sure to use class 1 turbine oil (with no additives) ISO VG32.Stopping lubrication later may lead to malfunctions because the new lubricant will cancel out the original lubricant. There-fore, lubrication must be continued once it has been started.
Lubrication
Caution
1. Avoid operation that causes negative pres-sure inside the cylinder.Take precautions under operating conditions in which nega-tive pressure is increased inside the cylinder by external for-ces or inertial forces. Air leakage may occur due to separa-tion of the seal belt.
Caution
MY3A_3B.qxd 03.5.14 2:47 PM Page 34
32
Actuator Precautions 3Be sure to read before handling.
Series MY3A/3B
1. Use clean air.Do not use compressed air containing chemicals, synthetic oils containing organic solvents, salt or corrosive gases, as this can cause damage or malfunction.
Air Supply
Warning
1. Install air filters.Install air filters at the upstream side of valves. The filtration degree should be 5 µm or finer.
2. Install an after-cooler, air dryer or water sep-arator, etc.Air that includes excessive drainage or condensate may cause malfunction of valves and other pneumatic equipment. To prevent this, install an after-cooler, air dryer or water separator, etc.
3. Use the product within the specified range of fluid and ambient temperature.Take measures to prevent freezing when 5°C or less, since moisture in circuits can freeze and cause damage to seals and lead to malfunctions.
Refer to SMC’s Best Pneumatics catalog Vol. 4 for further details on compressed air quality.
Caution
1. Do not use in environments where there is a danger of corrosion.Refer to the construction drawings regarding cylinder materi-als.
2. Avoid use in environments where a cylinder will come in contact with coolants, cutting oil, water, adhesive matter, or dust, etc. Also avoid operation with compressed air that contains drainage or foreign matter, etc.
• Foreign matter or liquids on the cylinder's interior or exterior can wash out the lubricating grease, which can lead to deterioration and damage of dust seal band and seal materials, causing a danger of malfunction.
When operating in locations with exposure to water and oil drops, or in dusty locations, provide protection such as a cover to prevent direct contact with the cylinder, or mount so that the dust seal band surface faces downward, and operate with clean compressed air.
Operating EnvironmentOperating Environment
Warning
1. Perform maintenance inspection according to the procedure indicated in the instruction manual.Improper handling and maintenance may cause malfunction-ing and damage of machinery or equipment to occur.
MaintenanceMaintenance
Warning
1. Filter drainageDrain out condensate from air filters regularly.
Caution
CautionCentralized Piping Port Variations
• Head cover piping connection can be freely selected to best suit different piping conditions.
2. Removal of components, and supply/exhaust of compressed air.When equipment is removed, first check measures to prevent dropping of driven objects and run-away of equipment, etc. Then cut off the supply pressure and electric power, and ex-haust all compressed air from the system.When machinery is restarted, proceed with caution after con-firming measures to prevent cylinder lurching.
Port variations
R
R L
R L
R
LL
L R
Slide table operating direction
R L
R L
R
L
R
L
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33
Auto Switch Precautions 1Be sure to read before handling.
Series MY3A/3B
1. Confirm the specifications.Read the specifications carefully and use this product appropriately. The product may be damaged or malfunction if it is used outside the range of specifications of current load, voltage, temperature or impact.
2. Take precautions when multiple cylinders are used close together.When two or more auto switch cylinders are lined up in close proximity to each other, magnetic field interference may cause the switches to malfunction. Maintain a minimum cylinder separation of 40 mm. (When the allowable interval is specified for each cylinder series, use the indicated value.)
3. Pay attention to the length of time that a switch is on at an intermediate stroke posi-tion.When an auto switch is placed at an intermediate position of the stroke and a load is driven at the time the piston passes, the auto switch will operate, but if the speed is too great, the operating time will be shortened and the load may not operate properly. The maximum detectable piston speed is:
4. Keep wiring as short as possible.<Reed switch>As the length of the wiring to a load gets longer, the rush current at switching ON becomes greater, and this may shorten the product’s life. (The switch will stay ON all the time.)1) Use a contact protection box when the wire length is 5 m or
longer.<Solid state switch>2) Although wire length should not affect switch function, use
a wire that is 100 m or shorter.
5. Take precautions for the internal voltage drop of the switch.<Reed switch>1) Switches with an indicator light (Except D-A96, A96V)
• If auto switches are connected in series as shown below, take note that there will be a large voltage drop because of internal resistance in the light emitting diodes. (Refer to internal voltage drop in the auto switch specifications.)
[The voltage drop will be “n” times larger when “n” auto switches are connected.]
Even though an auto switch operates normally, the load may not operate.
Design and SelectionDesign and Selection
Load
• Similarly, when operating below a specified voltage, it is possible that the load may be ineffective even though the auto switch function is normal. Therefore, the formula below should be satisfied after confirming the minimum operating voltage of the load.
2) If the internal resistance of a light emitting diode causes a problem, select a switch without an indicator light (Model A90, A90V).
<Solid state switch>3) Generally, the internal voltage drop will be greater with a 2-
wire solid state auto switch than with a reed switch. Take the same precautions as in 1) above.Also, note that a 12 VDC relay is not applicable.
6. Pay attention to leakage current.<Solid state switch>With a 2-wire solid state auto switch, current (leakage current) flows to the load to operate the internal circuit even when in the OFF state.
If the condition given in the above formula is not met, it will not reset correctly (stays ON). Use a 3-wire switch if this specification cannot be satisfied.Moreover, leakage current flow to the load will be “n” times larger when “n” auto switches are connected in parallel.
7. Do not use a load that generates surge vol-tage.<Reed switch>If driving a load such as a relay that generates a surge voltage, use a contact protection box.<Solid state switch>Although a zener diode for surge protection is connected at the output side of a solid state auto switch, damage may still occur if a surge is applied repeatedly. When directly driving a load which generates surge, such as a relay or solenoid valve, use a type of switch with a built-in surge absorbing element.
8. Cautions for use in an interlock circuitWhen an auto switch is used for an interlock signal requiring high reliability, devise a double interlock system to safeguard against malfunctions by providing a mechanical protection function, or by also using another switch (sensor) together with the auto switch. Also perform periodic inspection and confirm proper operation.
9. Ensure sufficient clearance for maintenance activities.When designing an application, be sure to allow sufficient clearance for maintenance and inspections.
Warning
V (mm/s) = Auto switch operating range (mm)
Load operating time (ms) 1000
Supplyvoltage
Internal voltagedrop of switch
Minimum operatingvoltage of load– >
>Current to operate load (OFF condition)
Leakage current
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34
Auto Switch Precautions 2Be sure to read before handling.
Series MY3A/3B
1. Do not drop or bump.Do not drop, bump or apply excessive impacts (300m/s2 or more for reed switches and 1000m/s2 or more for solid state switches) while handling.Although the body of the switch may not be damaged, the inside of the switch could be damaged and cause a malfunction.
2. Do not carry a cylinder by the auto switch lead wires.Never carry a cylinder by its lead wires. This may not only cause broken lead wires, but it may cause internal elements of the switch to be damaged by the stress.
3. Mount switches using the proper tightening torque.When a switch is tightened beyond the range of tightening torque, the mounting screws, or switch may be damaged. On the other hand, tightening below torque range may allow the switch to slip out of position.
4. Mount a switch at the center of the operating range.Adjust the mounting position of an auto switch so that the piston stops at the center of the operating range (the range in which a switch is ON). (The mounting positions shown in the catalog indicate the optimum position at stroke end.) If mounted at the end of the operating range (around the borderline of ON and OFF), operation will be unstable.
5. Do not allow short circuit of loads.<Reed switch>If the power is turned ON with a load in a short circuited condition, the switch will be instantly damaged because of excess current flow into the switch.<Solid state switch>D-M9 and all models of PNP output type switches do not have built-in short circuit protection circuits. If loads are short circuited, the switches will be instantly damaged, as in the case of reed switches.Take special care to avoid reverse wiring with the brown [red] power supply line and the black [white] output line on 3-wire type switches.
6. Avoid incorrect wiring.<Reed switch>A 24 VDC switch with indicator light has polarity. The brown [red] lead wire is (+), and the blue [black] lead wire is (–).1) If connections are reversed, the switch will still operate, but
the light emitting diode will not light up.Also note that a current greater than the maximum specified one will damage a light emitting diode and make it inoperable.Applicable models: D-A93, A93V
<Solid state switch>1) Even if connections are reversed on a 2-wire type switch,
the switch will not be damaged because it is protected by a protection circuit, but it will remain in a normally ON state. But reverse wiring in a load short circuit condition should be avoided to protect the switch from being damaged.
2) Even if power supply line (+) and power supply line (–) power supply line connections are reversed on a 3-wire type switch, the switch will be protected by a protection circuit. However, if the power supply line (+) is connected to the blue [black] wire and the power supply line (–) is connected to the black [white] wire, the switch will be damaged.
Mounting and AdjustmentMounting and Adjustment WiringWiring
1. Avoid repeatedly bending or stretching lead wires.Broken lead wires will result from repeatedly applying bending stress or stretching force to the lead wires.
2. Be sure to connect the load before power is applied.<2-wire type>If the power is turned ON when an auto switch is not connected to a load, the switch will be instantly damaged because of excess current.
3. Confirm proper insulation of wiring.Be certain that there is no faulty wiring insulation (such as contact with other circuits, ground fault, improper insulation between terminals, etc.). Damage may occur due to excess current flow into a switch.
4. Do not wire in conjunction with power lines or high voltage lines.Wire separately from power lines or high voltage lines, avoiding parallel wiring or wiring in the same conduit with these lines. Control circuits containing auto switches may malfunction due to noise from these other lines.
WiringWiring
Warning
Warning
∗ Lead wire color changes
OldRed
Black
NewBrownBlue
Output (+)Output ()
2-wireOldRed
BlackWhite
NewBrownBlueBlack
Power supplyGNDOutput
3-wire
OldRed
BlackWhiteYellow
NewBrownBlueBlack
Orange
Power supplyGNDOutputDiagnostic output
Solid state with diagnostic output
OldRed
BlackWhite
Yellow
NewBrownBlueBlack
Orange
Power supply GNDOutputLatch typediagnostic output
Solid state with latchtype diagnostic output
Lead wire colors of SMC switches have been changed in order to meet NECA Standard 0402 for production beginning September, 1996 and thereafter. Please refer to the tables provided.Special care should be taken regarding wire polarity during the time that the old colors still coexist with the new colors.
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35
Auto Switch Precautions 3Be sure to read before handling.
Series MY3A/3B
1. Never use in an atmosphere of explosive ga-ses. The construction of auto switches is not intended to prevent explosion. Never use in an atmosphere with an explosive gas since this may cause a serious explosion.
2. Do not use in an area where a magnetic field is generated.Auto switches will malfunction or magnets inside cylinders will become demagnetized if used in such an environment.
3. Do not use in an environment where the auto switch will be continually exposed to water.Switches satisfy IEC standard IP67 construction (JIS C 0920: watertight construction). Nevertheless, they should not be used in applications where they are continually exposed to water splash or spray. This may cause deterioration of the insulation or swelling of the potting resin inside switches may cause malfunction.
4. Do not use in an environment with oil or chemicals.Consult with SMC if auto switches will be used in an environment laden with coolant, cleaning solvent, various oils or chemicals. If auto switches are used under these conditions for even a short time, they may be adversely affected by a deterioration of the insulation, a malfunction due to swelling of the potting resin, or hardening of the lead wires.
5. Do not use in an environment with tempera-ture cycles.Consult with SMC if switches are to be used where there are temperature cycles other than normal temperature changes, as they may be adversely affected internally.
6. Do not use in an environment where there is excessive impact shock.<Reed switch>When excessive impact (300 m/s2 or more) is applied to a reed switch during operation, the contact point may malfunction and generate or cut off a signal momentarily (1 ms or less). Consult with SMC regarding the need to use a solid state switch depending upon the environment.
7. Do not use in an area where surges are gen-erated.<Solid state switch>When there are units (such as solenoid type lifters, high frequency induction furnaces, motors, etc.) that generate a large amount of surge in the area around cylinders with solid state auto switches, their proximity or pressure may cause deterioration or damage to the internal circuit elements of the switches. Avoid sources of surge generation and crossed lines.
8. Avoid accumulation of iron debris or close contact with magnetic substances.When a large accumulated amount of ferrous waste such as machining chips or welding spatter, or a magnetic substance (something attracted by a magnet) is brought into close proximity to an cylinder with auto switches, this may cause the auto switches to malfunction due to a loss of the magnetic force inside the cylinder.
Operating EnvironmentOperating Environment
1. Perform the following maintenance periodi-cally in order to prevent possible danger due to unexpected auto switch malfunction.1) Securely tighten switch mounting screws.
If screws become loose or the mounting position is dislocated, retighten them after readjusting the mounting position.
2) Confirm that there is no damage to lead wires.To prevent faulty insulation, replace switches or repair lead wires, etc., if damage is discovered.
3) Confirm that the green light on the 2-color display type switch lights up.Confirm that the green LED is ON when stopped at the set position. If the red LED is ON, when stopped at the set position, the mounting position is not appropriate. Readjust the mounting position until the green LED lights up.
MaintenanceMaintenance
1. Consult with SMC concerning water resis-tance, elasticity of lead wires and usage at welding sites, etc.
OtherOther
Warning Warning
Warning
MY3A_3B.qxd 03.5.14 2:47 PM Page 38
1. Use caution not to have your hands caught in the unit.When using a cylinder with stroke adjusting unit, the space between the slide table (slider) and the stroke adjusting unit is very narrow. Care should be taken to avoid the danger of hands being caught in this small space. Install a protective cover to prevent the risk of accidents to the human body.
2. Use an external guide (MY3B). The stroke adjusting unit must be used on condition that an external guide is used. If a stroke adjusting unit is used where the cylinder is used alone, the collision reaction may cause damage to the cylinder.
3. Conduct stroke adjustment with an adjustment bolt as follows: The adjustment bolt should be secured on the same surface as the shock absorber after stroke adjustment.If the stopper surface of the shock absorber and the end surface of the adjustment bolt are not on the same level, it may result in an unstable stop position of the slide table or reduced durability.
4. Securing the unit body
Tighten the four unit fixing bolts equally to secure the unit body.
5. Do not fix and use the stroke adjusting unit at an intermediate position (MY3B).If the stroke adjusting unit is fixed at an intermediate position, an error may result depending on the collision energy. In that case, the use of the holder mounting bracket for adjustment is recommended. It is provided with the "-X416" or "-X417" made-to-order specification.(Refer to the tightening torque for the stroke adjusting unit fixing bolt.)If the stroke adjusting unit is used at an intermediate position, the energy absorption capacity may be different. Refer to the maximum absorbed energy on page 7 and operate within the allowable absorption energy.
<Stroke adjustment with adjustment bolt>Loosen the lock nut for the adjustment bolt, adjust the stroke on the head cover side with a hexagon wrench, and secure with a lock nut.
<Stroke adjustment with shock absorber>Loosen the two unit fixing bolts on the shock absorber side and rotate the shock absorber for stroke adjustment. Tighten the unit fixing bolts equally to secure the shock absorber (MY3B). Use caution not to overtighten the fixing bolts.(Refer to the tightening torque for the MY3B stroke adjusting unit fixing bolt.)
36
Handling
Caution
<MY3B>
Shock absorber
Stroke adjusting unitAdjusting bolt lock nut
Bore size (mm)
16
25
40
63
UnitHLHLHLH
Tightening torque1.21.23.33.3
10 3.3
10
Unit: Nm
0.6
3.0
12
24
LHLHLHLH
MY3B stroke adjusting unitTightening torque for holding bolts
Specific Product Precautions 1Be sure to read before handling.Refer to pages 29 through 35 for safety instructions, actuator precautions and auto switch precautions.
Series MY3A/3B
Shock absorber
Same side
Adjusting bolt
MY3A_3B.qxd 03.5.14 2:47 PM Page 39
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Printed in Japan.
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SLOVENIASMC Industrijska Avtomatika d.o.o.
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INDIASMC Pneumatics (India) Pvt. Ltd.
INDONESIAPT. SMC Pneumatics Indonesia
MALAYSIASMC Pneumatics (S.E.A.) Sdn. Bhd.
PHILIPPINESSMC Pneumatics (Philippines), Inc.
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MEXICOSMC Corporation (Mexico) S.A. de C.V.USASMC Corporation of America