After Replacement MS 2406 with new motor

History:• MS 2406 is 225 kW, I FL : 423 amp, 400 V, 4 poles, 50

Hz• Replacement MS2406 with new motor on 31

January 2017• Replace Power cable between MCCB to Busbar Line

(before size 3x1x120 mm2 to 3x2x120mm2) on 1st February 2017

• Replace Contactor with new one on 8 February 2017• Measure resistance of power cable (6 cores) from

motor terminal to Contactor terminal output, result : all are good (0.278Ω)

• Tightening all bolt and nut at terminal.• Solo run new motor without pulley on 31

January 2017. Result :• R phase = 201.8 Ampere• S phase = 202.4 Ampere• T phase = 199.3 Ampere

• On 7 February 2017, took current of motor. Result:

• R phase = 365.4 Ampere• S phase = 360.1 Ampere• T phase = 386.8 Ampere

• On 8 February 2017, took current and voltage. Result:• R phase = 382 Ampere• S phase = 380 ampere• T phase = 403 Ampere• R-S = 389 Volt• S-T = 390.1 Volt• R-T = 392 Volt

• On 13 February 2017, took current and result:• R phase = 406 Ampere• S phase = 398 Ampere• T phase = 428 Ampere

• On 24 February 2017, took current 2 times, • R phase = 416 ampere• S phase = 392 ampere On 13:30• T phase = 400 ampere• R phase = 403 ampere• S phase = 379 ampereOn13:40, adjust the underflow• T phase = 386 ampere valve

• On 26 February 2017, took current and result:• R phase = 419 Ampere• S phase = 394 ampere• T phase = 405 ampere

Power cable resistance and new cable (3x120mm2 change to 3x2x120mm2)

Solo run motor on 31 January 2017

Current on 7 Feb.2017 (left) and 8 Feb. 2017 (right)

Current on 13 Feb.2017

Current on 24 February 2017

Took current on 13:30 Took current on 13:40 after adjustment the Underflow valve

MS 4206 underflow valve

Underflow valve

MCCB

FILTER

INVERTER

3x240mm2

3x240mm2

NSC 630K

FILTER

CONTACTOR CONTACTOR

MS 2406 Motor

MS 2428 Motor

MCCB MCCB NSX 630N

Over LoadRelay

Over LoadRelay

2x(3x120mm2), NEW REPLACEMENT

NSX 630N

NFI 600

NFI 600, 600 AmpCONTACTOR

3x240mm2

NYY 2x(3x150mm2)

LC1D475 LC1D475

LC1D500, NEW REPLACEMENT

LR9 F 7379 LR9 F 7379

AC REACTOR

SIMPLE FLOW POWER SEPARATOR SYSTEM

NOTE:

: BUSBAR: NYY CABLE: TERMINAL

CONTACTOR LC1D475

Cable resistance is 0.278 Ω

BUSBAR LINE 400 V

530 A, 0.013 mHClass F

Summary:

• After replace with new motor, new power cable and new contactor, and 6 times measurement of motor current, the current of motor always change, it is not high only one phase (before T phase) but the other phase also (R or S phase)

• On 24 February 2017, 2 times measurement. 1st condition is took on 13:30 and 2nd condition with a little adjustment of Underflow valve on 13:40. The current motor decrease while the valve little bit open.

Table of Motor CurrentPhase (ampere)

Date R S T31 January 2017 (solo run)

201.8 202.4 199.37 February 2017 365.4 360.1 386.88 February 2017 382 380 40313 February 2017 406 398 42824 February 2017 (13:30)

416 392 40024 February 2017 (13:40)

403 379 38626 February 2017 419 394 405

• Question:• Why the load/current between phase is not

equal? (have more 20 ampere)• What is caused?