LOW VOLTAGE MOTOR CONTROLGEAR FIELD TEST AND INSPECTION

LOW VOLTAGE MOTOR CONTROL GEAR FIELD INSTALLATION TESTS

VISUAL INSPECTION

1. Inspect primary and auxiliary equipment for physical damage, missing parts and proper assembly.

2.  Compare equipment nameplate data with one line diagram, design plans and/or starter schedule.

3.   Check nameplate voltage and current ratings for breaker, contactors and fuses.

4.   Compare overload heaters with motor full load current for proper size.

5.   Verify component sizing versus load.

6.    Check stab finger to bus tightness on draw-out cubicles.

7.    Protective grounding is correctly installed and connected to main ground.

8.    Remove shipping and blocking material from Motor Control Center/Switchboard.

9.   Check draw-out cubicles and wire ways for cleanliness.

   YES

NO

 

 

MECHANICAL INSPECTION

1. Torque all accessible bolted connections.

2.    Check insulators and the insulation system.

3.     Inspect main bus and bus taps to switches and voltage transformers.

4.    Manually operate breakers and contactors. Check for freedom of movement of all moving parts.

5.    Check for main contact pressure, alignment and full contact area on contactors.

6.    Check operation of door mechanical circuit breaker trip and reset linkage.

YES

NO

ELECTRICAL INSPECTION

1.  Check wiring point to point and megger.

2.  Check wire markers, and that terminal block connections are secure and properly identified.

3.  Megger test main bus phase to ground and phase to phase.

4.  Measure bus resistance and joint contact resistance.

5.   Inspect all protective relays and devices for correct operation and settings.

6.     Check to see that space heaters are connected and operable.

7.    Megger horizontal and vertical bus and outgoing feeder circuits.

8.     Check calibration of VT’s, CT’s, voltmeters and ammeters.

9.      Check rating of all fuses.

10.   Verify under voltage relay trip/alarm function.

11.  Verify ground fault protection for 30 horsepower motors and larger.

12. Set motor circuit protectors.

13. Check effectiveness of tripping devices.

14. Megger and high potential test contactors and circuit breakers phase to phase and phase to ground.

15.  Measure the contact resistance of each power circuit breaker.

16.  Measure the contact resistance of each contactor.

17.  Check the Phase Rotation of the voltage on the main bus.

YES

NO


PLATE INFORMATION

Equipment Identification/manufacturer
Serial number/model number
Rated Voltage
Rated current
Interrupting Rating
TESTS ARE PERFORMED IN ACCORDANCE WITH VALUES RECOMMENDED BY THE MANUFACTURER OR VALUES IN P-000
MOTOR CONTROL CENTER RECORDED TEST DATA
ITEMS TESTED
MEGGER TEST
INSULATION
RESISTANCE IN MEG-OHMS
Phase A to Ground
Phase B to Ground
Phase C to Ground
Phase A to Phase B
Phase B to Phase C
Phase C to Phase A
MOTOR CONTROL CENTER CONTACT RESISTANCE
FEEDER NO.
Breaker or
Contactor No.
PHASE A Line to
load Micro-Ohms
PHASE B Line to
load Micro-Ohms
PHASE C Line to
load Micro-Ohms
MOTOR CONTROL CENTER DATA SHEET
Voltage Rating:______________
DEVICE
NO.
HORSE
POWER
FULL LOAD
CURRENT
MOTOR OVERLOAD
RELAY TYPE
RATING
FEEDER
NO.
FEEDER
INSULATION
RESISTANCE

 

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1 Response

  1. August 7, 2018

    […] Please read also: LOW VOLTAGE MOTOR CONTROLGEAR FIELD TEST AND INSPECTION […]

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