Repair manual

PS2 3703, PS3 3703, PS4 3703, PS3 5503, PS4 5503 Repair

Repair.fm 163

6.7.3 Motor Testing

Test Stator Insulation Resistance

1. Dry stator thoroughly and allow it to cool before testing.

2. Measure resistance between stator’s lead wire and motor frame

using Megger tester.

—Replace stator if test results fall below 20 M

Ω.

Test Stator Continuity

Test continuity between phase wire ends.

—Replace stator if any breaks are found.

Test Wire Resistance

Measure resistance of each phase using Megger tester.

—Replace stator if test results fluctuate more that ±5% of

manufacturer’s specification.

Locked Rotor Current Test

Lock rotor and apply 25% of rated voltage by lock transformer or

regulator.

—Current measurement test results should be similar to rated

current.

Test Oil Chamber Pressure

1. After installing mechanical seal, attach a vacuum pump to oil

housing.

2. Raise negative pressure inside the oil chamber to 60 cmHg (11.6

in.Hg).

IMPORTANT: DO NOT exceed 60 cmHg (11.6 in.Hg).

3. Hold the vacuum position for 10 seconds. The gauge should

remain absolutely stable.

—Replace mechanical seal upon failing vacuum test.

Test Thermal Protection (CTP)

1. Clean the points of the circle thermal protector (CTP).

2. Check the insulation resistance between each phase connection

on the protector and ground.

—Not less than 30 M

Ω with 500V Megger.