type A ELR20 / ELR30 type B DIFFERENTIAL RELAYS SERIES …...DIFFERENTIAL RELAYS SERIES ELR type A ELR20 / ELR30 type B ELR21 / ELR31 ... 9.3 Reading in double integer format p22 9.4

User handbook

DIFFERENTIAL RELAYS SERIES ELR

type A ELR20 / ELR30

type B ELR21 / ELR31

version 02.0x

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Société Française d’Etudes et de Réalisations Electroniques

Tél. : 04 78 16 04 04 - Fax. : 04 78 16 04 05Tel. Intern. : 33 4 78 16 04 04 - Fax Intern. : 33 4 78 16 04 05

Siège : Route de Brindas - Parc d’Activité d’Arbora - N°269510 SOUCIEU EN JARREST - FRANCE

http: //www.sfere-net.come-mail: [email protected]

p1

Summary Summary1 . INTRODUCTION p2

2 . FUNCTIONS p2

3 . FEATURES p2

4 . SPACE REQUIREMENTS p3

5 . CONNECTINGS p3

6 . PROGRAMMING p5

6.1 Communication with the instrument p5 6.2 Orientation through the programming p6 6.3 Main menu p6 6.4 Programming menu p6 6.5 Reading of the configuration p15

7 . GENERAL WARRANTY TERMS p17

8 . ANNEXE DIFFERENTIAL EARTH LEAKAGE TRANSFORMERS p18

9 . ANNEXE MODBUS p20

9.1 Table of the Modbus addresses p20 9.2 Description of the born Modbus functions p21 9.3 Reading in double integer format p22 9.4 CRC16 calculation algorythm p22

p2

1. INTRODUCTIONThe differential relays of the serie ELR are relays for the limitation of the earth leakage current: Of type A (measurement of pure alternating differential current (AC) or current with a pulsed continuous component) for the ELR20 and 30 Of type B (for currents identical to the type A, but also for differential sinusoidal currents up to 1000Hz, for differential sinusoidal or continuous pulsed currents, superim-posed to a pure continuous current) for the ELR21 and 31.Associated with a measure earth leakage transformer (of type TcA for the ELR20 or 30 and TcB for the ELR21 or 31) and a circuit breaker, they allow to perform on low voltage networks of the type TT, IT, TNS the following functions:

- protection from indirect contacts,- additional protection from direct contats,- limitation of the current leak,- protection from fires.

Their reinforced immunity as well as theirTRMS measurement technique garantee a maximum safety and a continuity of the electrical operation, avoiding ill-timed cuts. They include in addition a pre-alarm output, allowing the anticipation of insulation defaults without causing a trip.

2. FUNCTIONS

3. FEATURESPower supply Universal: from 20 to 270Vac and 20 to 300Vdc Power draw: 2W max or 4VA ELR20 or ELR30 4W max or 7VA ELR21 or ELR31

Insulation: 2kV-50Hz-1min (between supply and outputs)

Setting of the sensitiveness (I∆n) : 0.030 - 0.1 - 0.2 - 0.3 - 0.5 - 1 - 2 - 3ASetting of the initial network frequency: 50 or 60 Hz (and DC ELR21 and 31)Setting of the triggering:

Alarm: 50% - 60% - 70% - 80% of I∆nPre-alarm: 30% - 50% - 60% - 70% - 80% of I∆n

Setting of the time delay:Alarm: Mode general (instant) - Selective mode - Lapse: 0.02 - 0.1 - 0.2 - 0.3 - 0.4 - 0.5 - 0.75 - 1 - 2 - 5 - 10 sec.Pre-alarm: Lapse: 0.02 - 0.1 - 0.2 - 0.3 - 0.4 - 0.5 - 0.75 - 1 - 2 - 5 - 10 sec.

Setting of the hysteresis:Pre-alarm: 0% - 5% - 10% - 15% - 20% of I∆n

Alarm outputs: one NO contact per alarm, 8A/250Vac on resistive load

External control: potential free contact

Option: digital output RS485, protocole Modbus/Jbus EIA RS485Operating temperature: -5 to +55°CStorage temperature: -20 to +70°CDimensions: 26.5x80x13 mmMounting: on DIN railConnection: plug-off connector for screwed connectionProtection indice: housing and terminals IP20Standards: IEC 61008-1, IEC 60755

CodingType A

Option : N digital RS 485

ELR20 or ELR30 N

- LCD display allowing:• The permanent display of the instant leak current as well as the value of the tripping current.• The visualisation of the status of the alarms.• The configuration of the instrument.

- Programmable sensitiveness: 30mA to 3A (8 calibers)

- 2 relay outputs:Relay 1:Main output (Alarm)

• Tripping setpoint programmable (50 to 80% of I∆n)• Positive or negative safety (programmable)• 3 time delay modes: general (instant), selective or programmable lapse from 20ms to 10s.

Relay 2 :Pre-alarm output

• Tripping setpoint programmable (30 to 80% of I∆n)• Positive or negative safety (programmable)• Hysteresis programmable from 0 to 20%• Time delay programmable from 20ms to 10s.• Recording function.

or end of reclosing cycle contact *

*

* ELR30 and ELR31 only Type B

Option : N digital RS 485

ELR21 or ELR31 N

- Test and reset of the alarms by keyboard keys or external control.- Test of the connection with the earth leakage transformer.- Protection of the configuration by code.- function self-reclosing with programming of the number of reclosings (20 max.) Programming of the time between each reclosing (from 1 to 9999 sec.) and programming of the cycle reinitialisation time (from 1 to 9999 sec.)*

*

* definition according to IEC60755

p3

26.5 mm

Upper connectorsA3A2A1E2E1T2T1

S6S5S4S3S2S1N2N1

131

100

80

Lower connectors

4. SPACE REQUIREMENTS

Dimensions : 26.5 x 80 x 131 mmHousing: self-extinguishing case of black UL 94VO ABSMounting in switchbox: latching on symmetrical DIN rail. Plug-off connectors for screwed connections (2.5mm², flexible or rigid and 1.5mm² flexible or rigid for the terminals T1 to T6 and E1 E2 on ELR21 and 31)Protection: Case / terminals: IP 20

Operating temperature: -5 to 55°CStorage temperature: -20 to 70°C

5. CONNECTINGS

Installation and mounting

The instrument can be connected with hazardous electrical voltages.It must be mounted, connected and implemented respecting the current regulations, by a qualified technician.This product is only a part of a protection system, which includes other elements (the earth leakage transformer, the circuit breaker etc....).It is necessary after the installation and recommended periodically to perform a test of the correct operation of the system.

U p p e r c o n n e c t o r s

SUPPLY EXTERNAL CONTROL

A3 A1

AC ~ ~DC + -

A2 E2 E1

T2 T1

Test /external reset

Earth lea-kage trans-former TCAxx

For the ELR21 or 31 use preferably a connection cable reference CBBXX (see the annexe EARTH LEAKAGE TRANSFORMER).Otherwise take care to make the shortest possible connection between the diffe-rential relay and the earth leakage transformer.Use preferably twisted cables, or even shielded cables in the case of a very disturbed environment, and connect the shielding on each side to the terminals T2 for the ELR20 or 30 and T5 for the ELR21 or 31.

L o w e r c o n n e c t o r s

S6 S5 S4 S3 S2 S1pre-alarm or end of reclosing cycle contact

Alarm

N2 N1

AB(ELR30 or ELR31 only)

Upper connectorsA3A2A1E2E1T6............T1

S6S5S4S3S2S1N2N1

131

100

80

Lower connectors

ELR20 and 30 ELR21 and 31

(if option digital output)

T1T2

T6 - - - - T1

T6T1

T1 → T1T2 → T2---T6 → T6

EARTH LEAKAGE TRANSFORMER

OUTPUTS

Earth leakage transformer TCBxx

(coils of the relays not supplied)

p4

For triggering by emission of voltage

For triggering by lack of voltage

LOAD

L1 L2 L3 N

A3 A1 E2 E1 E.L.T. connection

S1S2S3S4S5S6

Pre-alarm witness light

Earth leakage transformer

Test reset

E.L

.T. l

ink

Note:- The earth leakage transformer must be crossed in the same direction by all the active cables of the line, including the neutral (if it is present).- All the cables must be at the center of the earth leakage transformer.- The earth cable should not go through the earth leakage transformer.

EXAMPLES OF WIRING DIAGRAMS

M

L1 L2 L3

A3 A1 E2 E1

S1S2S3S4S5S6



Test reset

N

E.L.T. connection

E.L.

T. li

nk

M

L1 L2 L3

A3 A1 E2 E1

S1S2S3S4S5S6



Test reset

N

E.L.T. connection

E.L.

T. li

nk

3 ~

p5

6. PROGRAMMING

6.1 Communication with the instrument

I : 5mAInst

I∆n :30mA

■ )) ■21 ●

Value of the program-med sensitiveness (1)

Alarm indicator

Alarm indication:1: alarm latched2: pre-alarm latched

Test key:Mode measure : setting in test position(launching of the alarms)Mode configuration:allows to move through the menus or increase the enterings

Reset key:Mode measure: reset of the alarmsMode configuration: allows to move through the menus or decrease the enterings

Display of the instant leak current or the latching cur-rent (2)

Type of time delay:Inst: mode general or instantS : Selective modeXXmS: value of the pro-grammed time delay (2)

Activity indicator

Indicator of digital communi-cation

Menu key for access to the configuration

Key validation for validation of menu and entering.Allows to access in mode measure to the value of the max. measured current (see p. 16)

(1) For the ELR30 and 31 the sensitiveness value is displayed alternating with the reclosing mode Auto R or Manu R(2) For the ELR30 and 31 in the case of the awaiting of an automatic reclosing the current and the type of time delay will appear alternating with the n° of the next reclosing and the time remai-ning before that reclosing.

Several functions can be accessed from the measure display

Reset of the alarms

Access to the max. measured current value page 16

Access to the main menu page 6MTest of the alarms

M+ Access to the menu parametering of the earth leakage transformer page 17

Reading convention: Move through the main menu Revert to the previous menu Blinking display: awaiting validation or setting Alternating information display

Entering of a parameter: First start by increasing or decreasing the 1st digit and the sign: from -9 to +9. The 2nd from 0 to 9.

The 3rd from 0 to 9.

The 4th from 0 to 9. And then the decimal point if it needs to be entered.

and6888658865286520

«

Between each entering, validate the cipher with

65.20

M

+

+

Choice of the reclosing mode (ELR30) page 16

Display of the counter of the total of reclosings (ELR30) page 16

p6

6.2 Orientation through the programmingThe dialogue is ensured by 4 keys located on the front face.

Note: In mode programming, the instrument will automatically revert to the measure with the previous configuration if no key is pressed during 1min.In mode programming, the instrument will carry on measuring and managing its outputs with the old configuration.

MExit from a sub-menu to access the next menu / access to the programming exit menu

Move through the menus: downwards, or decrease the value shown

Move through the menus: upwards, or increase the value shown

Validation of the displayed parameter, or access to a submenu

6.3 Main menu

Mode rea-ding of the

configuration(see p15)

If code correct, access to the programming

menu (see right-hand

column)

If code incorrect, message appears

READ PROG

CODE

NO

8 888

« «

«

Programming of the access code

(see p16)

PCODE«

scrolling of the menus

vertical move

Entering of the access code.The access to the programming menu is protected by a 4-cipher code. The code is 0000 on factory exit (to change the code see p.16)

6.4 Programming menu

FREQ

Alarm

Pre.AL

J.BUS

Setting of the sensitiveness p7

Setting of the frequency p7

Configuration menu of the main alarm p8

Configuration menu of the pre-alarm p10

Configuration menu of the digital output p14(if option)

Access to the programming exit menu with or p14without saving of the configuration

Note: ⇒ In mode programming, the instrument will automatically revert to the measu-re with the previous configuration if no key is pressed during 1min.

I∆n

MNote: Press to go on to the next menu Move through the menus / choice

EXIT

ELR20 or 21

FREQ

Alarm

REL2

J.BUS

Setting of the sensitiveness p7

Setting of the frequency p7

Configuration menu of the main alarm p8

Configuration menu of the pre-alarm p10

Configuration menu of the automatic reclosing p12

Configuration menu of the digital output p14(if option)

Access to the programming exit menu with or p14without saving of the configuration

I∆n

EXIT

ELR30 or 31

Auto.R

Upwards move / increase

Validation / vertical moveDownwards move / decrease

Menu exit / accessM

p7

I∆nProgramming of the sensitiveness

I∆n

FREQ

« « « « « « « «

30mA 100mA 200mA 300mA 500mA 1A 2A 3A

Programming of the initial network frequency FREQ

FREQ

Alarm

« «

50 Hz 60 Hz ELR 20 and 30

FREQ

Alarm

« «ELR 21 and 31

«DC 50 Hz 60 Hz

p8

Programming of the main alarm Alarm

Alarm

SECU

DELAY

«

«

«

« «

« « « «

INSTA

«

SELEC

« «

Pre.AL

«

NEG.S POS.S

SpT.50% 60% 70% 80%

TIME*

* possible only if I∆n > 30mA

« « « « « « « « « « «

20ms 100ms 200ms 300ms 400ms 500ms 750ms 1 SEC 2 SEC 5 SEC 10 SEC* * * * * * * * * *

Programming of the type of time delay for the switching into alarm

Choice of the triggering value (% of I∆n)

Choice of the safety mode:NEG.S: the relay coil is supplied in alarm positionPOS.S: the relay coil is not supplied in alarm position

p9

InsTA

SELEC

TIME

:

:

:

Mode instant or general

Selective mode

fixed time delay

} In these 2 modes the time delay varies according to the pro-grammed sensitiveness and the measured leak current (see the table 1 from the standard IEC 610008-1)

table 1

Maximum operating time and minimum no response time according to the measured alternating current (RMS value).

Type I∆n (A) I∆n 2I∆n 5I∆n 500Ageneral or instant

any value0.3s 0.15s 0.04s 0.04s

Maximumoperating time

selective > 0.03 A0.5s 0.2s 0.15s 0.15s

0.13s 0.06s 0.05s 0.04sMinimum no response time

p10

Programming of the pre-alarm Pre.ALPre.AL

SECU

«

NEG.S

«

POS.S

«

Hyst.

«

0%

«

5%

«

10%

«

15%

«

20%

«DELAY

«

TIME

«

MEMO

«

YES

«

no

«

J.BUS EXITOR

if option

« « « « « « « « « « «

20ms 100ms 200ms 300ms 400ms 500ms 750ms 1 SEC 2 SEC 5 SEC 10 SEC


recording of the pre-alarm, or not


SPT.

«

«

50%

«

60%

«

70%

«

80%

«

Choice of the triggering setpoint (% of I∆n)

Choice of the hysteresis value (% de I∆n)

Out of alarm

alarm

spt.spt. -Hyst

OFF

«

30%

ELR20 or 21

p11

Programming of the Relais 2 REL2

Pre.AL

SECU

«

NEG.S

«

POS.S

«

Hyst.

«0%

«

5%«

10%«

15%«

20%«

DELAY

«

TIME

«

MEMO

«

YES

«

no

«

Auto.R EXITOR

« « « « « « « « « ««

20ms 100ms 200ms 300ms 400ms 500ms 750ms 1 SEC 2 SEC 5 SEC 10 SEC


recording of the pre-alarm, or not


SPT.

«

«

50%

«

60%

«

70%

«

80%

«

Choice of the triggering setpoint (% of I∆n)

Choice of the hysteresis value (% of I∆n)

Out of alarm

alarm

spt.spt. -Hyst

OFF

«

30%

ELR30 or 31

End C Relay 2 in pre-alarm output

Mode

REL2

Relay 2 in end of automatic reclosing cycle contact

p12

T.R1

Auto.R

J.BUS EXITOR

Programming of the automatic reclosing Auto.R

ON OFFMode

8888

«RAZ C.

8888

«NB

8888

«

8888

«T.Rxx

choice of the reclosing mode: ON: automatic OFF: manual

Programming of the reinitialisation time (in se-conds) of the automatic reclosing cycle in case the error disappears

Number of automatic reclosings in the cycle

Programming of the time (in seconds) between each reclosingxx: number of reclosings (NB)}

if option

ELR30 or 31

p13

Note:

I : XXmAInst

I∆n :30mA

I : XXmAInst

Auto R

I : XXmAInst

Manu R

or

)

When an error surges the relay will send an opening commande to the circuit breaker. After the programmed time «T.R1» the relay will then send a closing command to the circuit breaker.It will thus perform as many attempts as the number programmed in the variable «NB» (max. 20 times). If all the attempts fail the relay will remain open, until a manual reset, a keyboard or remote reset (external control or digital data link).Once the reset is performed the automatic reclosing cycle will start.Note: A reset performed during the reclosing cycle will let the cycle start again. The relay 2 can be programmed to trip at the end of the cycle (Mode => End C.).

If after a reclosing no error appears during the time programmed in the variable «RAZ C.» the cycle will reinitialise itself and start again from 0 at the next error.

To stop the automatic reclosing function set the mode on OFF. You will then switch to a manual reclosing. A quick access to the changing of mode (without going through the programming) is possible, see p16The current type of mode is indicated alternating with the value of the assigned current.

I : XXmAInst

I∆n :30mA

Rx inYYYS

Auto R

) Reclosing n°X in YYY seconds

Note: During the awaiting of the next reclosing the value of the remaining time as well as the number of the reclosing will appear alternating with the value of the default current and the type of time lapse.

Circuitbreakerclosed

Circuitbreakeropen

Operating of the automatic reclosing function

Error

Reclosing n°1

Error Error Error

Reclosing n°2 Reclosing n°«NB»

End of cycleReclosing possible only in manual

T.R1 T.R2 T.R«NB»

p14

Communication parametersslave number

must be between 1 and 255

transmission speed

«

SLAVE «

-8888 JBUS

time delay before any reply

NO: typical time lapse 10ms

«

YES

«

NO

Option digital output

JBUS

See also the features of the digi-tal data link p18

«

DELAY

«

PARIT «

EVEN

«

NONE

«

ODD

«

FORM «

L-H

«

H-L

Transmission rank of the bytes of an integer H-L: MSB of the integer transmit-ted firstL-H: LSB of the integer transmit-ted first

Choice of the parity NONEEVENODD

EXIT

YES: typical time lapse 75ms

SAVE

EXITNOYES

Exit from the programming with or without saving

exit and save the configura-tion

exit without saving the configuration

revertto the measure display

EXIT

«

2400

«

4800

«

9600

«

19.2K

«

38.4K

«

57.6K

«

115.2K

«

1200

«

BAUD

Upwards move / increase

Validation / vertical moveDownwards move / decrease

Menu exit / accessM

p15

INFOELR

20N

PROG

xxxx

ORIG

xx.xx

CSUM

PC-x

65F2

Validation / vertical move

name of the instrument

(1)- : standard versionN : digital output

Submenu

type of the instrument

options of the instrument

identification number of the instrument

programme version number

origin of the instrument

check sum of the programme

no

READ

I∆nFREQAlarmPre.AL

Reading of the sensitiveness

Reading of the frequency

Reading of the main alarm configuration Reading of the pre-alarm configuration Reading of the digital data link configuration (if option) Reading of the instrument internal parameters


J.BUS

INFO

READ6.5 Reading of the configuration

ELR20 or 21

READ

I∆nFREQAlarmREL2

Reading of the sensitiveness

Reading of the frequency

Reading of the main alarm configuration Reading of the pre-alarm configuration

Configuration menu of the automatic reclosing Reading of the digital data link configuration (if option) Reading of the instrument internal parameters


J.BUS

INFO

ELR30 or 31

Auto.R

In each reading submenu, use the keys and to move, and to visualise the parameters.

If no key is pressed during 20 s. the instrument will revert to the measure display. During the reading of the programming, the instrument will carry on measuring and managing its outputs.

p16

Programming of a new access code

Reminder: If no key is pressed during 1 min, the instrument will revert to the measure display. On factory exit the access code is 0000.

PCOD OLDNO

Enter pre-vious code

if code not valid(old)

display during 2s. and revert to the measure display

New code registered, and revert to the measure display

if code correct(old)

Enter the new code

NEW

Visualisation of the max. measured current value

Mode measure

I: max

▼I: xxmA

alternating display

maximum value

CLR.M

M

if you press the maximum recorded value will be deleted, and revert to the mode measure

Note: the max. value will not be recorded in case of power supply cut.

Changing of reclosing mode (ELR30 or 31 only)

Mode measure

Auto.R

+

ON OFFMode

automaticreclosing

Modemanual

reclosing

A counter of the total number of reclosings is increased at each auto-matic triggering.Note: This counter will not be saved in case of power supply cut.

Visualisation of the total number of reclosings (ELR30 or 31 only)

Mode measure

Tot.R

+M

XXXX

alternating display

number of automaticreclosings

Cl.Tot

M

p17

Saturation of the input

Mode measure

Menu parametering of the earth leakage transformer (ELR20 and 30 only)

code

«

M +

enter the code

access to the menu by simultaneous pressing of M +

RAP.TI

8 888

«

RPt.TI

ON OFF

SAVE

YES NO

*

* Caution: the programming of a wrong ratio would provoque a false measure

saving of the earth leakage transformer parameters, or not

detection of earth leakage transformer connection rupture: ON or OFF

enter the earth leakage transformer ratio500 ≤ Ratio ≤ 1000

RPt.TI

ON : The ELR20 will permanently detect the presence of the earth leakage transformer.If the connection with the earth leakage transformer is cut it will trigger the main alarm and show the message OPEN

OFF: No detection of the earth leakage transformer presence

Error messages

Rupture of the connection with the earth leakage transformer

Configuration memory error

Programming error (incoherent programming parameter)

Calibration error

OPENEr.FLAER.01ER.08

Note: If the instrument detects one of these 4 errors it will trig-ger the main alarm and show the corresponding message.

7. GENERAL WARRANTY TERMSWARRANTY applying and durationThis instrument is under warranty for a duration of 1 year against any design or manufacturing defects, under normal operating conditions. Processing conditions *: The processing not under warranty will be submit-ted to the acceptance of a repair estimate. The customer will return the pro-ducts at his charge, and they will be restored to him after processing. Without a written agreement on the repair estimate within 30 days, the products will not be held.

* Complete warranty terms and details available on request.

OvL

p18

8. ANNEXE 1: EARTH LEAKAGE TRANSFORMER

Differential earth leakage transformersTCA for type A relay: ELR20 or ELR30TCB for type B relay: ELR21 or ELR31

Recommendations for use:The earth leakage transformer must be crossed in the same direction by all the active cables of the line, including the neutral (if present).Do not let the earth cable go through the earth leakage transformer.Maintain the cables at the center of the earth leakage transformer.

no yes

PE NL1L2L3

They perform the algebraic sum of the currents inside the active leads (phase and neutral), thus allowing the detec-tion of any leak current even in the case of a very low value.

They are foreseen for wall mounting, but can also be mounted on DIN rail thanks to specific provided fastenings.

Take care to make the shortest possible connection between the differential relay and the earth leakage transformer.Use preferably twisted cables, or even shielded cables in the case of a very disturbed environment, and connect the shielding on both sides to the termi-nals T2 for the ELR20 or 30 and terminals T5 for the ELR21 or 31.

Connection

Relay ELR20 or 30

T1T2

T1T2

TCB earth leakage transformer

For the connection of the ELR21 or 31 to the earth leakage transformer of type TCB you can also use a cable.

1 meter long connection cable: reference CBB012 meter long connection cable: reference CBB025 meter long connection cable: reference CBB05

T1T2T3T4T5T6

T1T2T3T4T5T6

Relay ELR21 or 31 TCB earth leakage transformer

p19

Dimensions

TCA TCB

Reference A B C D E F GTCB35 95 91 24 35 111 125 49TCB70 127 110 24 70 144 157 49TCB110 162 145 24 110 179 192 49

A slow blinking (1.3Hz) of the checking LED indicates a correct operation.A fast blinking (10 Hz or a fixed position (still or lit) of the checking LED indicates a system error: problem on the earth leakage trans-former, or on the relay, or on the connection between them.

Type A B C D E FTCA35 81 71 26 35 96 111TCA70 120 110 26 70 134 150TCA110 170 160 26 110 184 200

D C

E

F

A

B

cheking led

p20

Word address0123456789

10

Descriptionmeasure of the input instant currentdecimal point / unitmeasure of the displayed current valuedecimal point / unitmeasure of the max. recorded current valuedecimal point / unitself-diagnosisstatus of the alarmsreclosing cycletime lapse before the next reclosingtotal number of reclosings

9. ANNEXE 2: MODBUS

9.1 Table of the modbus addresses

MeasuresThe following parameters: instant measure, displayed measure and max. recorded measure will be transmitted in the form of a module and a unit associated with a position of the decimal point.Eg.:

Coding of the integer decimal point / unit H L

dec.point unit: code of correspondance in the list hereunder 0: no decimal 0: none16: 1 decimal 1: V32: 2 decimals 2: kV48: 3 decimals etc ...Eg.: 416 = 1 X 256 + 161The integer encodes the unit mA with 1 decimalHence the measure read is 10.6 mA

BYTE BYTE

Table of the unitsCode Unit Code Unit Code Unit Code Unit Code Unit

000 001 V 002 KV 003 A 004 KA005 W 006 KW 007 MW 008 GW 009 VAr010 KVAR 011 MVAR 012 GVAR 013 VA 014 KVA015 MVA 016 GVA 017 Wh 018 KWh 019 MWh020 GWh 021 VARh 022 KVARh

023 MVARh024 GVARh025 Hz 026 Khz 027 Deg 028 Ohms 029 Kohms030 h 031 mn 032 s 033 % 034 cos PHI035 to 099 free

100 °C 101 °F 102 % 103 mm 104 cm105 m 106 km 107 mBar 108 Bar 109 Pa110 Kpa 111 Kg/cm2112 PSI 113 mCE 114 l/s115 l/mn 116 l/h 117 m3/s 118 m3/mn119 m3/h120 tr/s 121 rad/s

122 mm/s 123 cm/s 124 m/s125 m/mn 126 m/h 127 mm3 128 cm3 129 m3 130 g 131 kg 132 t 133 l 134 hl135 Rpm 136 CP/mn137 PH 138 mV AC139 V AC140 KV AC141 mA AC142 A AC 143 KA AC

144 mV DC145 V DC 146 KV DC147 mA DC148 A DC 149 KA DC150 Ohms 151 Kohms152 Mohms153 US.gal/s154 US.gal/min155 US.gal/h156 US.gal157 lb 158 C 159 imp160 CP 161 mA 162 A 163 mA.h 164 A.h165 µV 166 mV

bit

(0) programming error(1) rupture of the connection with the earth leakage transformer(2) input saturation (3) calibration error(4) external command status(5) test mode status(6) main alarm triggered(7) end of the automatic reclosing cycle (ELR30)

Self-diagnosis integer: (address 6 integer)

(15) memory error

(6) (5) (4) (3) (2) (1) (0)(15)

Integer status of the alarms (address 7 integer)

01234567

status of the alarm

status of the relay

} }pre-alarm main alarm

} ELR30 or 31 only

(7)

Word address01

Decimal value106416

Codingmoduledecimal point / unit

p21

Reclosing cycle (address 8 integer)

byte byte

H L15 0

L: total number of reclosings programmed per cycleH: number of reclosings performed in the cycle

Time lapse before the next reclosing (address 9 integer)

Value in seconds before the next reclosing.

Total number of reclosings (address 10 integer)

Value of the counter of the total of reclosings performed since the last zero reset of the counter (setting of the relay on tension, or reset of the counter from the keyboard).

External control via the digital data link

Writing of an integer to address 50

0: Reset of the alarms and zero reset of the reclosing cycle (ELR30)

65535 : Switching to the external test mode Triggering of the alarms (equivalent to the closing of the logic input)

23130 : Zero reset of the counter of the total of reclosings

2 bytes

CRC 16

Slave number

1 byte 1 byte 1 byte

Function3 or 4

2 bytes

CRC 16Number of read bytes

Reply sequence:1st word

MSB

value

LSB2 bytes

2nd word

MSB

value

LSB2 bytes

Slave number

1 byte 1 byte

Function16

2 bytes

CRC 161st word address

Nbr of words to be enfor.

Writing of N words: Function N°16:Request sequence:

Value of the words to be enforced

2 bytes 2 bytes

Nbr of words to be enfor.

2 bytes

Nbr of bytes to be enfor.

1 byte n bytes

Slave number


Function16

1st word address

Reply sequence:

2 bytes

CRC 16

Slave number

1 byte 1 byte

Function6

2 bytes

CRC 16Address

of the word

Writing of 1 word: Function N°6:Request sequence:

2 bytes

Value of the word to be enf.

2 bytes

Value of the word to be enf.

2 bytes

Slave number

1 byte 1 byte 2 bytes

Function6

Address of the word

2 bytes

CRC 16Slave number


Function reques-ted with MSB=1

Error code

Reply sequence:

Exception sequence:Value of the error codes:1: Unknown function code2: Address incorrect3: Data incorrect9: Writing impossible

Slave number

1 byte 1 byte

Function3 or 4

2 bytes

CRC 161st word

MSB

address

LSB

Number

MSB

of words

LSB2 bytes 2 bytes

Request sequence:

9.2 Description of the born modbus functions: Reading of N words: Function n°3

p22

Note 1: ⊕ = exclusive or.Note 2: POLY = A001 (hex).Note 3: The CRC16 calculation applies to all bytes in the sequence (except CRC16).Note 4: Caution! In the CRC 16, the 1st sent byte is the LSB.Example: Sequence 1-3-0-75-0-2 CRC16 = 180-29 (the values are decimal).

Measure = byte 3 x 2563 + byte 4 x 2562 + byte 1 x 256 + byte 2 = 0 x 2563 + 0 x 2562 + 19 x 256 + 136 = 5000

Reading of the address 3 => decimal point = 2 => displayed measure = 50.00

00000000

byte 3

00000000

byte 4

00010011

byte 1

10001000

byte 2

0

Sign : 0 positive 1 negative

0 19 136

Value of the measure:

254 3 4 19

• Reply with a positive measure:

136 0 CRC 160

measure

byte 1 byte 2 byte 3 byte 4 2 bytes

254 03 0 2

9.3 Reading in double integer format:Example: Reading of the displayed measureRequest:

0AddressReading

of n words

Slave number

Number of words

2 CRC 16

Measure = -(byte 3 x 2563 + byte 4 x 2562 + byte 1 x 256 + byte 2) = -(0 x 2563 + 0 x 2562 + 19 x 256 + 136) = - 5000Reading of address 3 => decimal point = 2 => displayed measure -50.00

11111111

byte 3

11111111

byte 4

111 0 11 0 0

byte 1

0 1111 0 0 0

byte 2

Sign: 1 negative: reversal of the bits, and plus 1.

254 3 4 236

• Reply with a negative measure:

120 255 CRC 16255

measure

byte 1 byte 2 byte 3 byte 4 2 bytes

00000000

byte 3

00000000

byte 4

00010011

byte 1

10000111

byte 2

00000000

byte 3

00000000

byte 4

00010011

byte 1

10001000

byte 2

0 0 19 136

Adding of 1

Reversal

9.4 CRC 16 calculation algorythm:

FFFF → CRC

CRC ⊕ BYTE→ CRC

yesno

n = 0

n = n + 1

yesno

shifting by 1 bit to the right of CRC

carry

CRC ⊕ poly → CRC

n > 7

next byte

no

END

yes

end of sequence

type A ELR20 / ELR30 type B DIFFERENTIAL RELAYS SERIES …...DIFFERENTIAL RELAYS SERIES ELR type A ELR20 / ELR30 type B ELR21 / ELR31 ... 9.3 Reading in double integer format p22 9.4

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