Service instructions - Grundfosnet.grundfos.com/Appl/ccmsservices/public/literature/filedata/Gr... · Service instructions MS6 ... Materials: EN 1.4301 and NBR rubber Shaft seal:

Service instructions

MS63.7 kW - 30 kW

50/60 Hz3~

96163810 0510 GB 1 / 32

1. Symbols used in this document..................................................................................................... 22. Identification .................................................................................................................................... 22.1 Nameplate ........................................................................................................................................................... 22.2 Frequency converter operation............................................................................................................................ 22.3 Product number key............................................................................................................................................. 32.4 Type key .............................................................................................................................................................. 43. Tightening torques and lubricants................................................................................................. 44. Service tools .................................................................................................................................... 54.1 Special tools ........................................................................................................................................................ 64.2 Standard tools...................................................................................................................................................... 64.3 Torque tools......................................................................................................................................................... 65. General information......................................................................................................................... 75.1 Position numbers ................................................................................................................................................. 75.2 Before dismantling ............................................................................................................................................... 75.3 Before assembly .................................................................................................................................................. 75.4 During assembly .................................................................................................................................................. 76. Inspection......................................................................................................................................... 87. Dismantling and assembly ............................................................................................................. 97.1 3.7 - 9.2 kW / 5-12 hp .......................................................................................................................................... 97.2 11-30 kW / 5-40 hp ............................................................................................................................................ 138. Maintenance and service .............................................................................................................. 179. Fault finding ................................................................................................................................... 1710. Checking the motor and cable ..................................................................................................... 1810.1 Measuring the insulation resistance .................................................................................................................. 1911. Winding resistances...................................................................................................................... 2011.1 MS6T30 ............................................................................................................................................................. 2011.2 MS6T60 ............................................................................................................................................................. 2211.3 Resistance values for cables ............................................................................................................................. 2411.4 Cable connection ............................................................................................................................................... 2412. Drawings, model A ........................................................................................................................ 2512.1 3.7 - 9.2 kW / 5-12 hp ........................................................................................................................................ 2512.2 11-30 kW / 15-40 hp .......................................................................................................................................... 2713. Drawings, model B ........................................................................................................................ 2913.1 3.7 - 9.2 kW / 5-12 hp ........................................................................................................................................ 2913.2 11-30 kW / 15-40 hp, model B ........................................................................................................................... 31

1. Symbols used in this document

2. Identification

2.1 Nameplate

Fig. 1 Nameplate

2.2 Frequency converter operationIf the motor has been connected to a frequency converter, the temperature transmitter is damaged. Change the nameplate by striking through "Transmitter temp". The change must permanent so use for instance an engraving stylus. See fig. 2.

Fig. 2 Nameplate with change

WarningIf these safety instructions are not observed, it may result in personal injury!

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Pos. Description Pos. Description

1 Model (A = first generation) 13 Service factor2 Output power in [kW] and [hp] 14 Serial number

3 Product number- 78XXXXXX: Product without packaging 15 Cos φ

4 Type designation 16 Production code5 Number of phases 17 Rated speed min-1

6 Supply voltage 18 Rated current7 Frequency 19 Net weight in [kg] and [lb]

8 Maximum liquid temperature at minimum flow past the motor 20 Enclosure class

9 Motor designed for continuous operation (S1) 21 Insulation class10 Built-in Tempcon temperature transmitter 22 Country of production11 CE mark and approvals 23 Connection12 Maximum operating pressure 24 Locked-rotor current in kVA per hp

TM04

554

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09

MS6REST30

MADE IN HUNGARY

Phase[-]3 500 50 18.5 1.00 2840

[V] [Hz] [kW] [hp] [-] [min ]Voltage Frequency SF n

No.78395647 SN: 10000001 PC P10715Model: AP2

max.

-1

3 525 50 18.5 1.00 28603 575 60 18.5 25 1.15

31.0[A]

Max. SF. C.

29.531.0

0.88[-]

Cos

0.860.88 3430

Weight: 64 kg/141lbDuty S1 Transmitter temp. pmax. 60 bar kVA code D IP 68 Ins.cl. F

417

18

2021

19

5

89

10

11

12

67

2223

3 1 1413 16152

USC

tLiquid 30°C at 0.15 m/s /86°F at 0.5 ft/s Connection D

P2

24

MS6REST30

MADE IN HUNGARY

Phase[-]3 380 50 30 1.00 2840

[V] [Hz] [kW] [hp] [-] [min ]Voltage Frequency SF n

No.78195650 SN: 10000001 PC P20639Model: AP2

max.

-1

3 400 50 30 1.00 28703 415 50 30 1.00

67.0[A]

Max. SF. C.

65.065.5

0.88[-]

Cos

0.840.80 2880

Weight: 78 kg/ lbDuty S1 Transmitter temp. pmax. 60 bar IP 68 Ins.cl. F

USC

tLiquid 30°C at 0.15 m/s / °F at 0.5 ft/s Connection D

P2

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2.3 Product number keyExample 78 39 56 47Motor type78: MS6Supply voltage09: 3 x 200 V, 50 Hz / 3 x 200-220 V, 60 Hz10: 3 x 220-230 V, 50 Hz19: 3 x 380-400-415 V, 50 Hz60: 3 x 220-230 V, 50 Hz, SD63: 3 x 400 V, 50 Hz / 3 x 400-440 V, 60 Hz, SD64: 3 x 400 V, 50 Hz / 3 x 400-440 V 60 Hz, DOL/SD69: 3 x 380-400-415 V, 50 Hz, SD28: 3 x 208-230 V, 60 Hz33: 3 x 380 V, 60 Hz35: 3 x 400, 50 Hz / 3 x 440-460 V, 60 Hz39: 3 x 500-525 V, 50 Hz / 3 x 575 V, 60 Hz80: 3 x 208-230 V, 60 Hz, SD83: 3 x 380 V, 60 Hz, SDStandard versions45MS6T30, without TempconMaterials: EN 1.4301 and NBR rubberShaft seal: carbon/ceramic. Radial bearing: carbon/steel50MS6WT30, with TempconMaterials: EN 1.4301 and NBR rubberShaft seal: carbon/ceramic. Radial bearing: tungsten carbide/SiC51MS6RESWT30, with TempconMaterials: EN 1.4539 and FKM rubberShaft seal: SiC/SiC. Radial bearing: tungsten carbide/SiC52MS6EST30, with TempconMaterials: EN 1.4301 and FKM rubberShaft seal: SiC/SiC. Radial bearing: carbon/ceramic55MS6T30, with TempconMaterials: EN 1.4301 and NBR rubberShaft seal: carbon/ceramic. Radial bearing: carbon/ceramic56MS6REST30, with TempconMaterials: EN 1.4539 and FKM rubberShaft seal: SiC/SiC. Radial bearing: carbon/ceramic58MS6T60, with TempconMaterials: EN 1.4301 and NBR rubberShaft seal: carbon/ceramic. Radial bearing: carbon/ceramic59MS6REST60, with TempconMaterials: EN 1.4539 and FKMShaft seal: SiC/SiC. Radial bearing: carbon/ceramic61MS6RESWT60, with TempconMaterials: EN 1.4539 and FKM rubberShaft seal: SiC/SiC. Radial bearing: tungsten carbide/SiC86MS6RESDT30, with TempconMaterials: EN 1.4539 and FKM rubber, filled with demineralised waterShaft seal: SiC/SiC. Radial bearing: carbon/ceramicOutput power39: 3.7 kW, 5.0 hp40: 4.0 kW, 5.5 hp41: 5.5 kW, 7.5 hp42: 7.5 kW, 10 hp43: 9.2 kW, 12 hp44: 11 kW, 15 hp45: 13 kW, 18 hp46: 15 kW, 20 hp47: 18.5 kW, 25 hp48: 22 kW, 30 hp49: 26 kW, 35 hp50: 30 kW, 40 hp

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2.4 Type key-

3. Tightening torques and lubricants

Rocol Sapphire Aqua-Sil: product number RM2924 (1 kg).Gardolube L6250: product number 96163819.Note: To ensure correct assembly when using Gardolube L6250, the parts must be tightened when the lubricant is still wet.

Example MS 6 R E S W D T60

Type rangeMS: Motor submersible

Motor diameter [inch]

MaterialBlank: stainless steel EN 1.4301 (AISI 304)R: stainless steel EN 1.4539 (AISI 904L)

Rubber partsBlank: NBRE: FKM

Shaft sealBlank: ceramic/carbonS: SiC/SiC

Radial bearingsBlank: carbon/stainless steelW: SiC/tungsten carbide

Motor liquidBlank: SML-3D: demineralised water

Maximum liquid temperatureT30: 86 °F (30 °C)T60: 140 °F (60 °C)

Pos. Description Quantity Dimensions Torque [Nm] Lubricant

213 End cover 1 250 Gardolube

215Screw 3.7 - 9.2 kW 1 M5 4Screw 11 - 30 kW 2 M6 7

216b Nut (model A) 1 M18 110 Gardolube219 Thrust bearing housing 1 250 Gardolube

220a O-ring 1 24 x 2.0 mm - Rocol Sapphire Aqua-Sil222 Valve 1 M12 25

222b O-ring 1 11 x 2.0 mm - Rocol Sapphire Aqua-Sil

224O-ring (3.7 - 9.2 kW) 1 128 x 3.0 mm - Rocol Sapphire Aqua-SilO-ring (11 - 30 kW) 2 128 x 3.0 mm - Rocol Sapphire Aqua-Sil

226 Shaft seal housing 1 100 Gardolube236 Bearing retainer, lower 1 250 Gardolube

236a Screw 2 M6 4231 O-ring 1 66 x 2.0 mm - Rocol Sapphire Aqua-Sil248 Screw 2 M6 6

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4. Service toolsA B C D

E F G H

I J K L

M N O P

Q R S T

U V W X

Y Z

5 / 30

4.1 Special tools

4.2 Standard tools

4.3 Torque tools

Pos. Description For pos. Further information Part number

A Tool for bearing retainer 236 96163768B Tool for end cover 213 96163771C Strap wrench 219 48" SV0853D Tool for shaft 202 96163797E Punch for shaft seal 226b V7216306F Jaws 201 SV7900G Shaft height gauge 201, 202 6" SV0115H Filling syringe 201 SV8000I Tool for thrust bearing (model A) 216b 96163765J Tool for thrust bearing (model B) 208 - 96163888K Punch for thrust bearing (model B) 202 - 96163887

Pos. Description For pos. Further information Part number

L Hexagon socket 226, W, Y 1/2" 96777072M Screwdriver 226b SV0804N Angle screwdriver 205 5.5 x 5.5 V0220186

O Tee key215, 236a 3 mm SV0153

248 4 mm SV0181222 8 mm SV0050

P Rubber mallet 207 SV0349Q Puller 208 - -

Pos. Description For pos. Further information Part number

R Torque wrench

213, 216b, 219, 226, 236, 222, A, B, W,

Y, W

30 - 300 Nm SV0500

S Torque wrench 236a, T 9 x 12 mm SV0292

T Ratchet insert tool 222, 236a, U, Z 9 x 12 SV0295

U Hexagon head driver236a M6 - 5 mm SV0296222 M10 - 8 mm SV0298

V Torque screwdriver 215, X 1-6 Nm SV0435W Impact socket 226 41 mm, 3/4" 96921142X Hexagon bit 215 HX-4 V7125730Y Hexagon socket 216b 4 mm x 25 mm, 1/4" SV0424Z Adapter W 3/4" - 1/2" 96921542

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5. General information

5.1 Position numbersPosition numbers of motor parts (digits) refer to exploded views and parts lists in section 12. Drawings, model A and 13. Drawings, model B; position numbers of service tools (letters) refer to section 4. Service tools.

5.2 Before dismantling• Switch off the power supply to the motor.• Disconnect the power supply cable in accordance with local regulations.

5.3 Before assembly• Clean and check all parts.• Replace defective parts by new parts.• Order the necessary service kits.• Always replace gaskets and O-rings when the motor is serviced.

5.4 During assembly• Lubricate and tighten screws and nuts to the correct torque. See section 3. Tightening torques and lubricants.

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6. Inspection1. Check the cable and the electric parts. See section 10. Checking the motor and cable.2. Check that the holes in end cover (pos. 213) are not clogged.3. Check that shaft with rotor (pos. 202) rotates freely and noiselessly.4. Remove sand shield (pos. 229).5. Check the distance between rotor shaft end (pos. 202) and stator housing (pos. 201) using a shaft height

gauge (pos. G).6. Remove shaft seal housing (pos. 226).7. Check if stationary shaft seal part (pos. 226a) is worn or damaged. Replace, if necessary.8. Pull off rotating shaft seal part (pos. 226b) using two screwdrivers.9. Check the spring action of rotating shaft seal part (pos. 226b).10.Model B: Remove washer (pos. 153a).11. Pull out upper bearing retainer (pos. 205) using an angle screwdriver (pos. N) or a similar tool.12.Check the bearing surfaces of upper bearing retainer (pos. 205).13.Check that stator housing (pos. 201) is filled with motor liquid. Refill, if necessary.14.Turn shaft with rotor (pos. 202) to let air escape (3.7- 9.2 kW).15.11-30 kW: Move shaft with rotor (pos. 202) up and down in stator housing (pos. 201) to let air escape.16.Fit upper bearing retainer (pos. 205) on shaft with rotor (pos. 202). Check that it is in the correct position.17.Lubricate rotor shaft end (pos. 202) and rotating shaft seal part (pos. 226b) with motor liquid.18.Fit rotating shaft seal part (pos. 226b) on shaft with rotor (pos. 202) using a soft punch (pos. E).19.Lubricate the thread of shaft seal hosing (pos. 226). Tighten shaft seal housing (pos. 226). See section

3. Tightening torques and lubricants.20.Push sand shield (pos. 229) onto shaft with rotor (pos. 202).21.Check that the shaft rotates freely and noiselessly.22.Remove valve (pos. 222). Fill the stator housing with liquid using a filling syringe (pos. H). Move shaft with

rotor (pos. 202) up and down in stator housing (pos. 201) to let air escape. Repeat until the stator housing has been filled.

23.Fit and tighten valve (pos. 222). See section 3. Tightening torques and lubricants.24.Tighten the two screws of motor cable (pos. 248), if necessary. See section 3. Tightening torques and

lubricants.

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7. Dismantling and assembly

7.1 3.7 - 9.2 kW / 5-12 hp

7.1.1 Dismantling the motor1. Remove the two screws of motor cable (pos. 248).2. Pull motor cable (pos. 220) out of stator housing (pos. 201) and check it for visible damage.3. Remove sand shield (pos. 229).4. Remove shaft seal housing (pos. 226).5. Pull off rotating shaft seal part (pos. 226b) using two screwdrivers.6. Model B: Remove washer (pos. 153a).7. Check the spring action of rotating shaft seal part (pos. 226b).8. Pull out upper bearing retainer (pos. 205) using an angle screwdriver (pos. N) or a similar tool.9. Check the bearing surfaces of upper bearing retainer (pos. 205).10.Tilt stator housing (pos. 201) and drain the motor liquid into a bucket.11. Place the stator housing in a horizontal position and loosen end cover (pos. 213) with tool for end cover

(pos. B).12.Remove strainer (pos. 207).13.Remove the two screws (pos. 236a) of lower bearing retainer (pos. 236).14.Loosen lower bearing retainer (pos. 236) with tool for bearing retainer (pos. A) and remove it.15.Check if the radial bearings in lower bearing retainer (pos. 236) are worn or damaged.16.Pull out shaft with rotor (pos. 202) a little and remove stationary thrust bearing (pos. 203) from the rotor shaft.17.Check if stationary thrust bearing (pos. 203) is worn or damaged.18.Pull out shaft with rotor (pos. 202). Check if the rotor has dragged against the stator, and if the bearing

surfaces of the rotor are worn.19.Remove upthrust disc (pos. 242) from shaft with rotor (pos. 202). Check if it is worn or damaged.20.Model A: Hold the rotor shaft with tool for thrust bearing (pos. D) and remove nut (pos. 216b). Remove nut

(pos. 216b), rotating thrust ring (pos. 206) and thrust bearing support (208) from shaft with rotor (pos. 202). Check if they are worn or damaged.

21.Model B: Remove O-ring (pos. 216d) and thrust ring (pos. 206). Check thrust bearing support (pos. 208).

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7.1.2 Assembling the motor

Fitting the shaft with rotor1. Model A: Lubricate the thread on the non-drive end of shaft with rotor (pos. 202). See section 3. Tightening

torques and lubricants.2. Model A: Fit thrust bearing support (pos. 208) and thrust ring (pos. 206) on shaft with rotor (pos. 202). See fig.

3.Model B: Fit conical thrust bearing support (pos. 208) using punch (pos. K). Fit thrust ring (pos. 206) and O-ring (pos. 216d). See fig. 3.

Fig. 3 Correct fitting of thrust bearing

3. Model A: Fit and tighten nut (pos. 216b) with a strap wrench and tool for thrust bearing (pos. C and D). See section 3. Tightening torques and lubricants.

4. Check that thrust ring (pos. 206) can move freely.5. Fit upthrust disc (pos. 242) on shaft with rotor (pos. 202).6. Insert shaft with rotor (pos. 202) carefully into stator housing (pos. 201).7. Fit stationary thrust bearing (pos. 203) on shaft with rotor (pos. 202).8. Lubricate the inner thread of lower bearing retainer (pos. 236) and outer thread of stator housing (pos. 201).

See section 3. Tightening torques and lubricants.9. Fit lower bearing retainer (pos. 236) on shaft with rotor (pos. 202) so that the pins engage with the slots of

thrust bearing (pos. 203). See fig. 4.

Fig. 4 Position of thrust bearing

10.Press on lower bearing retainer (pos. 236) to push shaft with rotor (pos. 202) home into stator housing (pos. 201).

11. Fasten lower bearing retainer (pos. 236) on stator housing (pos. 201) with tool for bearing retainer (pos. A). See section 3. Tightening torques and lubricants.

12.Fit the two screws (pos. 236a) for lower bearing retainer (pos. 236). See section 3. Tightening torques and lubricants.

13.Slacken screw (pos. 215) in lower bearing retainer (pos. 236).14.Place stator housing (pos. 201) in a vertical position.15.Fit upper bearing retainer (pos. 205) on shaft with rotor (pos. 202). Check that it is in the correct position.16.Check the distance between rotor shaft end (pos. 202) and stator housing (pos. 201) using a shaft height

gauge (pos. G). The distance must be 72.8 ± 0.2 mm. See fig. 6.

Model A Model B

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17.Turn thrust bearing retainer (pos. 210) with a tee key or a similar tool to adjust the distance. See fig. 5.

Fig. 5 Adjusting the distance

18.Check the distance between rotor shaft end (pos. 202) and stator housing (pos. 201) again. The distance must be 72.8 ± 0.2 mm. See fig. 6.

Fig. 6 Checking the distance

19.Place the stator in a horizontal position and tighten screw (pos. 215) in lower bearing retainer (pos. 236). See section 3. Tightening torques and lubricants.

20.Fit strainer (pos. 207).21.Lubricate the thread of lower bearing retainer (pos. 236) and end cover (pos. 213). See section 3. Tightening

torques and lubricants.22.Check that diaphragm (pos. 212), spring (pos. 218) and O-ring (pos. 224) are positioned correctly in end cover

(pos. 213), and that they are intact.23.Screw end cover (pos. 213) on lower bearing retainer (pos. 236).24.Tighten end cover (pos. 213) with tool for end cover (pos. B). See section 3. Tightening torques and

lubricants.

Filling of motor liquid1. Place stator housing (pos. 201) in a vertical position. Pull out upper bearing retainer (pos. 205) using an angle

screwdriver (pos. N) or a similar tool.2. Fill stator housing (pos. 201) with motor liquid.3. Tilt stator housing (pos. 201) and turn shaft with rotor (pos. 202) to let air escape. Do not lift the rotor shaft.4. Place stator housing (pos. 201) in a vertical position.5. Fill more motor liquid into stator housing (pos. 201), if necessary.6. Fit upper bearing retainer (pos. 205) on shaft with rotor (pos. 202). Check that it is in the correct position.7. Model A: Lubricate rotor shaft end (pos. 202) and rotating shaft seal part (pos. 226b) with motor liquid.

Model B: Fit washer (pos. 153a).8. Fit rotating shaft seal part (pos. 226b) on shaft with rotor (pos. 202) using a soft punch (pos. E).9. Press stationary shaft seal part (pos. 226a) out of shaft seal housing (pos. 226) with a screwdriver.10.Knock lip seal (pos. 232) out of shaft seal housing (pos. 226) with a screwdriver (pos. M) and a rubber mallet

(pos. P). It may be stuck.

TM03

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11. Fit a new lip seal (pos. 232) in shaft seal housing (pos. 226) with the flat side against the motor. Use a soft punch (pos. E) and a rubber mallet (pos. P). See fig. 7.

12.Press a new stationary shaft seal part (pos. 226a) into shaft seal housing (pos. 226) with the shiny side against the motor. Use a soft punch (pos. E). See fig. 7.

13.Check that stationary shaft seal part (pos. 226a) is positioned correctly in shaft seal housing (pos. 226).

Fig. 7 Correct fitting of lip seal and stationary shaft seal part

14.Lubricate the thread of shaft seal hosing (pos. 226). See section 3. Tightening torques and lubricants.15.Tighten shaft seal housing (pos. 226). See section 3. Tightening torques and lubricants.16.Push sand shield (pos. 229) onto shaft with rotor (pos. 202).17.Check that the shaft rotates freely and noiselessly.18.Place stator housing (pos. 201) at an angle of approximately 45 ° with valve (pos. 222) pointing upwards.19.Remove valve (pos. 222). Fill the stator housing with motor liquid using a filling syringe (pos. H). Move shaft

with rotor (pos. 202) up and down in stator housing (pos. 201) to let air escape. Repeat until the stator housing has been filled.

20.Fit valve (pos. 222). See section 3. Tightening torques and lubricants.21.Connect motor cable (pos. 220) in stator housing (pos. 201) and fasten motor cable (pos. 220). See section

3. Tightening torques and lubricants.

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7.2 11-30 kW / 5-40 hp

7.2.1 Dismantling the motor1. Remove the two screws of motor cable (pos. 248).2. Pull motor cable (pos. 220) out of stator housing (pos. 201). Check it for visible damage.3. Remove sand shield (pos. 229).4. Remove shaft seal housing (pos. 226).5. Pull off rotating shaft seal part (pos. 226b) using two screwdrivers.6. Model B: Remove washer (pos. 153a).7. Check the spring action of rotating shaft seal part (pos. 226b).8. Pull out upper bearing retainer (pos. 205) using an angle screwdriver (pos. N) or a similar tool.9. Check the bearing surfaces of upper bearing retainer (pos. 205).10.Tilt stator housing (pos. 201) and drain the motor liquid into a bucket.11. Place the stator housing in a horizontal position and loosen end cover (pos. 213) with tool for end cover (pos.

B) and a strap wrench (pos. C).12.Remove strainer (pos. 207) and the two screws (pos. 215).13.Screw thrust bearing retainer (pos. 210) out of thrust bearing housing (pos. 219).14.Remove thrust bearing housing (pos. 219) with tool for end cover (pos. B) and remove stationary thrust

bearing (pos. 203) from shaft with rotor (pos. 202).15.Check if stationary thrust bearing (pos. 203) is worn or damaged.16.Model A: Remove nut (pos. 216b) and washer (pos. 216). Hold shaft with rotor (pos. 202) with tool for shaft

(pos. D).Model B: Remove O-ring (pos. 216d) and thrust ring (pos. 206). Check if they are worn or damaged.

17.Model A: Remove rotating thrust ring (pos. 206), thrust bearing support (pos. 208) and upthrust disc (242) from shaft with rotor (pos. 202). Check if they are worn or damaged.Model B: Remove thrust bearing support (pos. 208). Check if it is worn or damaged. Replace, if necessary.

18.Slacken the two screws (pos. 236a) of lower bearing retainer (pos. 236).19.Remove lower bearing retainer (pos. 236) with tool for bearing retainer (pos. A).20.Check if the radial bearings in lower bearing retainer (pos. 236) are worn or damaged.21.Pull out shaft with rotor (pos. 202). Check if the rotor has dragged against the stator, and if the bearing

surfaces of the rotor are worn.

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7.2.2 Assembling the motor

Fitting the shaft with rotor1. Model B: Fit upthrust disc (pos. 242) on shaft with rotor (pos. 202).2. Insert shaft with rotor (pos. 202) carefully into stator housing (pos. 201).3. Lubricate the inner thread of lower bearing retainer (pos. 236) and outer thread of stator housing (pos. 201).

See section 3. Tightening torques and lubricants.4. Fit lower bearing retainer (pos. 236) on shaft with rotor (pos. 202).5. Fasten lower bearing retainer (pos. 236) on stator housing (pos. 201) with tool for bearing retainer (pos. A).

See section 3. Tightening torques and lubricants.6. Fit and tighten the two screws (pos. 236a). See section 3. Tightening torques and lubricants.7. Model A: Fit upthrust disc (pos. 242) on shaft with rotor (pos. 202).8. Model A: Fit thrust bearing support (pos. 208) and thrust ring (pos. 206) on shaft with rotor (pos. 202). See fig.

8.Model B: Fit conical thrust bearing support (pos. 208) using punch (pos. K). Hold shaft with rotor (pos. 202).Fit thrust ring (pos. 206) and O-ring (pos. 216d). See fig. 8.

Fig. 8 Correct fitting of thrust bearing

9. Model A: Fit washer (pos. 216) on the rotor shaft and tighten nut (pos. 216b) with your fingers.10.Check that thrust ring (pos. 206) can move freely.11. Model A: Tighten nut (pos. 216b) with tool for shaft (pos. D). See section 3. Tightening torques and lubricants.12.Model A: Check that thrust ring (pos. 206) can move freely.13.Lubricate the thread of lower bearing retainer (pos. 236) and thrust bearing housing (pos. 219). See section

3. Tightening torques and lubricants.14.Place stationary thrust bearing (pos. 203) at the bottom of thrust bearing housing (pos. 219) with the bearing

surfaces against rotating thrust bearing (pos. 206).15.Screw thrust bearing housing (pos. 219) on the lower bearing retainer (pos. 236) while holding stationary

thrust bearing (pos. 203) in position with a finger through the hole in thrust bearing housing (pos. 219). See fig. 9.

Model A Model B

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16.Keep holding stationary thrust bearing (pos. 203) in position with a finger and press shaft with rotor (pos. 202) down against stationary thrust bearing (pos. 203).

Fig. 9 Keeping the stationary thrust bearing in position

17.Tighten thrust bearing housing (pos. 219) with tool for end cover (pos. B). See section 3. Tightening torques and lubricants.

18.Lubricate the thread of thrust bearing retainer (pos. 210) and fit it into thrust bearing housing (pos. 219). See section 3. Tightening torques and lubricants.

19.Place stator housing (pos. 201) in a vertical position.20.Fit upper bearing retainer (pos. 205) on shaft with rotor (pos. 202). Check that it is in the correct position.21.Check the distance between rotor shaft end (pos. 202) and stator housing (pos. 201) using a shaft height

gauge (pos. G). The distance must be 72.8 ± 0.2 mm. See fig. 6.22.Turn thrust bearing retainer (pos. 210) to adjust the distance. See fig. 10.

Fig. 10 Adjusting the distance

23.Place the stator housing in a horizontal position and tighten the two screws (pos. 215). See section 3. Tightening torques and lubricants.

24.Fit strainer (pos. 207).25.Lubricate the thread of thrust bearing housing (pos. 219) and end cover (pos. 213). See section 3. Tightening

torques and lubricants.26.Check that diaphragm (pos. 212), spring (pos. 218) and O-ring (pos. 224) are positioned correctly in end cover

(pos. 213), and that they are intact.27.Screw end cover (pos. 213) on lower bearing retainer (pos. 236).28.Place stator housing (pos. 201) in a horizontal position.29.Tighten end cover (pos. 213) with tool for end cover (pos. B). See section 3. Tightening torques and

lubricants.

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Filling of motor liquid1. Place stator housing (pos. 201) in a vertical position.2. Pull out upper bearing retainer (pos. 205) using an angle screwdriver (pos. N) or a similar tool.3. Fill stator housing (pos. 201) with motor liquid. Move shaft with rotor (pos. 202) up and down in stator housing

(pos. 201) to let air escape.4. Tilt stator housing (pos. 201) and turn shaft with rotor (pos. 202) to let air escape.5. Place stator housing (pos. 201) in a vertical position.6. Fill more motor liquid into stator housing (pos. 201), if necessary.7. Move shaft with rotor (pos. 202) up and down in stator housing (pos. 201) to let air escape.8. Fit upper bearing retainer (pos. 205) on shaft with rotor (pos. 202). Check that it is in the correct position.9. Lubricate rotor shaft end (pos. 202) and rotating shaft seal part (pos. 226b) with motor liquid.10.Model B: Fit washer (pos. 153a).11. Fit rotating shaft seal part (pos. 226b) on shaft with rotor (pos. 202) using a soft punch (pos. E).12.Press stationary shaft seal part (pos. 226a) out of shaft seal housing (pos. 226) with a screwdriver.13.Knock lip seal (pos. 232) out of shaft seal housing (pos. 226) with a screwdriver (pos. M) and a rubber mallet

(pos. P). Note: It has a tight fit.14.Fit a new lip seal (pos. 232) in shaft seal housing (pos. 226) with the flat side against the motor. Use a soft

punch (pos. E) and a rubber mallet (pos. P). See fig. 11.15.Press a new stationary shaft seal part (pos. 226a) into shaft seal housing (pos. 226) with the shiny side

against the motor. Use a soft punch (pos. E). See fig. 11.

Fig. 11 Correct fitting of lip seal and stationary shaft seal part

16.Check that stationary shaft seal part (pos. 226a) is positioned correctly in shaft seal housing (pos. 226).17.Lubricate the thread of shaft seal hosing (pos. 226). See section 3. Tightening torques and lubricants.18.Tighten shaft seal housing (pos. 226). See section 3. Tightening torques and lubricants.19.Push sand shield (pos. 229) onto shaft with rotor (pos. 202).20.Check that the shaft rotates freely and noiselessly.21.Place stator housing (pos. 201) at an angle of approximately 45 ° with valve (pos. 222) pointing upwards.22.Remove valve (pos. 222). Fill the stator housing with liquid using a filling syringe (pos. H). Move shaft with

rotor (pos. 202) up and down in stator housing (pos. 201) to let air escape. Repeat until the stator housing has been filled.

23.Fit valve (pos. 222). See section 3. Tightening torques and lubricants.24.Connect motor cable (pos. 220) in stator housing (pos. 201) and fasten motor cable (pos. 220). See section

3. Tightening torques and lubricants.

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928

3 37

07

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8. Maintenance and service

If Grundfos is requested to service a contaminated motor, Grundfos must be contacted with details about the pumped liquid, etc. before the motor is returned for service. Otherwise Grundfos can refuse to accept the motor for service.Possible costs of returning the motor are paid by the customer.

9. Fault finding

WarningIf a motor has been used in a liquid which is injurious to health or toxic, the motor will be classified as contaminated.

Fault Cause Remedy

1. The motor does not run.

a) The fuses are blown. Replace the fuses. Check the electrical installation and the submersible drop cable if the new fuses burn too.

b) The ELCB or the voltage-operated ELCB has tripped out. Cut in the circuit breaker.

c) No power supply. Contact the power supply company.d) Motor-protective circuit breaker has

tripped.Cut in the motor-protective circuit breaker (takes places automatically or must be done manually). Check the voltage if the motor-protective circuit breaker trips again. If the voltage is okay, see the items e) to h).

e) Motor-protective circuit breaker/contactor is defective. Replace the motor-protective circuit breaker/contactor.

f) Starter device is defective. Repair/replace the starter device.g) The control circuit has cut out or is

defective. Check the electrical installation.

h) Motor/submersible drop cable is defective. Repair/replace the motor/submersible drop cable.

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10. Checking the motor and cable1. Supply voltage

TM00

137

1 50

92

Measure the voltage between the phases by means of a voltmeter. On single-phase motors, measure between phase and neutral or between two phases, depending on the type of supply. Measure on the terminals where the submersible drop cable is connected.

When the motor is loaded, the voltage should be within the required voltage quality for Grundfos MS and MMS submersible motors which - measured at the motor terminals - is - 10 %/+ 6 % of the rated voltage for continuous operation (including variation in the supply voltage and losses in cables).Check also that there is voltage symmetry in the power supply lines, i.e. the same difference of voltage between the individual phases.Large variations in voltage may cause the motor to burn. Large variations in voltage indicate poor power supply, and the motor should be stopped until the defect has been remedied.

2. Current consumption

TM00

137

2 50

92

Measure the current of each phase while the pump is operating at a constant discharge pressure (if possible, at the capacity where the motor is most heavily loaded). For maximum operating current, see nameplate.

On three-phase motors, the difference between the current in the phase with the highest current consumption and the current in the phase with the lowest current consumption must not exceed 5 %. If so, or if the current exceeds the maximum operating current, there are the following possible faults:• The contacts of the motor-protective circuit breaker are

burnt.– Replace the contacts or the control box for single-

phase operation.• Poor connection of conductors, possibly in the cable

joint.– See item 3.

• Too high or too low supply voltage.– See item 1.

• The motor windings are short-circuited or partly disjointed.– See item 3.

• Damaged pump is causing the motor to be overloaded.– Pull out the pump for overhaul.

• The resistance value of the motor windings deviates too much (three-phase).– Move the phases in phase order to a more uniform

load. If this does not help, see item 3.Items 3 and 4: Measurement is not necessary when the supply voltage and current consumption are normal.3. Winding resistance

TM00

137

3 50

92

Disconnect the submersible drop cable at the motor-protective circuit breaker. Measure the winding resistance between the conductors of the submersible drop cable. See section 11. Winding resistances.Note: Include the resistance of the submersible drop cable. See section 11.3 Resistance values for cables.

For three-phase motors, the difference between the highest and lowest winding resistance must not exceed 10 %. If the deviation is higher, pull out the motor. Measure motor, motor cable and submersible drop cable separately, and repair/replace defective parts.

4. Insulation resistance

TM00

137

4 50

92

Disconnect the submersible drop cable at the motor-protective circuit breaker. Measure the insulation resistance from each phase to earth (frame). Make sure that the earth connection is made carefully.

If the insulation resistance deviates from the values in section 10.1 Insulation resistance, the motor should be pulled out for motor or cable repair. Local regulations may stipulate other values of insulation resistance.

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10.1 Insulation resistance

The table shows suggested values of insulation resistance and the test voltage in relation to the rated voltage of the motor.

If the rated motor voltage is ≤ 500 V, the insulation resistance must be measured at a test voltage of 500 VDC.If the rated motor voltage is > 500 V, the insulation resistance must be measured at a test voltage of 1000 VDC.

Note The insulation resistance must be measured in accordance with local regulations.

Rated voltage: ≤ 500 [V] > 500 [V]

Condition of motor and cable [MΩ] [MΩ]

New motor (without submersible drop cable) ≥ 200 ≥ 200Used motor which can be re-installed in well ≥ 10 ≥ 10New motor in well ≥ 20 ≥ 20Motor in good condition in well ≥ 0.5 ≥ 1Damaged insulation < 0.5 < 1

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11. Winding resistances

11.1 MS6T30

VoltageOutput power

Winding resistance

Between two phases Across one phase

[kW] [hp] [Ω]

3 x 220-230 V, 50 Hz, DOL

4 1.145.5 0.8207.5 0.5609.2 0.46011 0.36013 0.30015 0.260

18.5 0.20022 0.16026 0.14030 0.120

3 x 220-230 V, 50 Hz, SD

4 1.705.5 1.227.5 0.8409.2 0.68011 0.52013 0.46015 0.380

18.5 0.30022 0.24026 0.20030 0.180

3 x 380-400-415 V, 50 Hz, DOL

4 3.505.5 2.507.5 1.709.2 1.3411 1.1013 0.90015 0.760

18.5 0.62022 0.50026 0.42030 0.320

3 x 380-400-415 V, 50 Hz, SD

4 5.255.5 3.757.5 2.559.2 2.0011 1.6613 1.3415 1.14

18.5 0.94022 0.76026 0.62030 0.480

3 x 208-230 V, 60 Hz, DOL

3.7 5 0.8005.5 7.5 0.5807.5 10 0.4209.2 12 0.32011 15 0.26013 18 0.22015 20 0.180

18.5 25 0.140

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3 x 208-230 V, 60 Hz, DOL22 30 0.12026 35 0.10030 40 0.080

3 x 208-230 V, 60 Hz, SD

3.7 5 1.205.5 7.5 0.8607.5 10 0.6209.2 12 0.48011 15 0.38013 18 0.32015 20 0.280

18.5 25 0.20022 30 0.18026 35 0.14030 40 0.120

3 x 380 V, 60 Hz, DOL

3.4 5 2.065.5 7.5 1.547.5 10 1.089.2 12 0.84011 15 0.68013 18 0.58015 20 0.480

18.5 25 0.38022 30 0.32026 35 0.26030 40 0.240

3 x 380 V, 60 Hz, SD

3.7 5 3.105.5 7.5 2.327.5 10 1.629.2 12 1.2611 15 1.0213 18 0.86015 20 0.700

18.5 25 0.56022 30 0.48026 35 0.40030 40 0.340

3 x 400 V, 50 Hz, 3 x 440-460 V, 60 Hz, DOL

3.7 5 3.205.5 7.5 2.287.5 10 1.649.2 12 1.2611 15 0.98013 18 0.82015 20 0.700

18.5 25 0.54022 30 0.46026 35 0.38030 40 0.320

VoltageOutput power

Winding resistance

Between two phases Across one phase

[kW] [hp] [Ω]

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11.2 MS6T60

3 x 500-525 V, 50 Hz, 3 x 575 V, 60 Hz, DOL

4 5 5.105.5 7.5 3.957.5 10 2.759.2 12 2.2211 15 1.7213 18 1.4615 20 1.26

18.5 25 1.0222 30 0.82026 35 0.68030 40 0.560

VoltageOutput power

Winding resistance

Between two phases Across one phase

[kW] [hp] [Ω]

3 x 380-400-415 V, 50 Hz, DOL

4 3.155.5 2.027.5 1.569.2 1.2211 0.98013 0.84015 0.660

18.5 0.52022 0.440

3 x 380-400-415 V, 50 Hz, SD

4 4.705.5 3.057.5 2.349.2 1.8211 1.4613 1.2415 0.980

18.5 0.78022 0.660

3 x 380 V, 60 Hz, DOL

3.7 5 2.065.5 7.5 1.407.5 10 1.029.2 12 0.78011 15 0.66013 18 0.52015 20 0.460

18.5 25 0.36022 30 0.300

3 x 200 V, 50 Hz, 3 x 200-220 V, 60 Hz, DOL

4 0.7055.5 0.5057.5 0.3459.2 0.305

3 x 200 V, 50 Hz, 3 x 200-220 V, 60 Hz, SD

11 0.34013 0.28015 0.220

18.5 0.18022 0.140

VoltageOutput power

Winding resistance

Between two phases Across one phase

[kW] [hp] [Ω]

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3 x 400 V, 50 Hz, 3 x 400-440 V, 60 Hz, DOL

4 2.655.5 1.907.5 1.269.2 1.06

3 x 400 V, 50 Hz, 3 x 400-440 V, 60 Hz, SD

11 1.3213 1.0815 0.860

18.5 0.70022 0.540

VoltageOutput power

Winding resistance

Between two phases Across one phase

[kW] [hp] [Ω]

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11.3 Resistance values for cablesThe resistance in the power supply cable depends on the cable diameter.Resistance per metre of cable: 1.5 mm2 = 0.012 Ω.Resistance per metre of cable: 2.5 mm2 = 0.007 Ω.

11.4 Cable connection

Fig. 12 Wiring diagrams

Pos.Flat cable Single leads

4-wire 3-wire 4-wire

1 Brown Black Black2 Black Yellow Yellow3 Grey Red Red4 Yellow/green - Green

DOL SD

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9178

350

7

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12. Drawings, model A

12.1 3.7 - 9.2 kW / 5-12 hp

12.1.1 Exploded view

Fig. 13 3.7 - 9.2 kW / 5-12 hp, model A

TM03

615

5 43

06

25 / 30

12.1.2 Sectional drawing

Fig. 14 3.7 - 9.2 kW / 5-12 hp, model A

TM03

615

4 43

06

26 / 30

12.2 11-30 kW / 15-40 hp

12.2.1 Exploded view

Fig. 15 11-30 kW / 15-40 hp, model A

TM03

6188

440

6

27 / 30

12.2.2 Sectional drawing

Fig. 16 11-30 kW / 15-40 hp, model A

TM03

6153

430

6

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13. Drawings, model B

13.1 3.7 - 9.2 kW / 5-12 hp

13.1.1 Exploded view

Fig. 17 3.7 - 9.2 kW / 5-12 hp, model B

TM04

371

6 49

08

29 / 30

13.1.2 Sectional drawing

Fig. 18 3.7 - 9.2 kW / 5-12 hp, model B

TM04

527

8 30

09

30 / 30

13.2 11-30 kW / 15-40 hp, model B

13.2.1 Exploded view

Fig. 19 11-30 kW / 15-40 hp, model B

TM04

371

7 49

08

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13.2.2 Sectional drawing

Fig. 20 11-30 kW / 15-40 hp, model B

TM04

527

7 30

09

Subject to alterations.

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