GE Industrial Solutions AF-600 FP High Power (460V_575V 150HP and above) - Manual (Page 61)

4.7 After Repair Tests
Following any repair to a frequency converter or testing of a frequency converter suspected of being faulty, the following procedure must be followed to ensure
that all circuitry in the frequency converter is functioning properly before putting the unit into operation.
1. Perform visual inspection procedures as described in Table 3-1.
2. Perform static test procedures 6.2.1., 6.2.2 and 6.2.5 for 4x-frame size units or 6.2.3, 6.2.4 and 6.2.5 for 5x-frame size units to ensure frequency converter
is safe to start.
3. Disconnect the motor leads from the output terminals (U, V, W) of the frequency converter.
4. Apply AC power to the frequency converter.
5. Give the frequency converter a run command and slowly increase the reference (speed command) to approximately 40 Hz.
6. Using an analog voltmeter or a DVM capable of measuring true RMS, measure phase-to-phase output voltage on all three phases: U to V, U to W, V to
W. All voltages must be balanced within 8 volts. If unbalanced voltage is measured, refer to Input Voltage Test (6.3.2).
7. Stop the frequency converter and remove the input power. Allow 40 minutes for DC capacitors to fully discharge for 5x-frame size frequency converters
or 20 minutes for 4x-frame size frequency converters.
8. Reconnect the motor leads to the frequency converter output terminals (U, V, W).
9. Reapply power and restart the frequency converter. Adjust the motor speed to a nominal level.
10. Using a clamp-on style ammeter, measure the output current on each output phase. All currents should be balanced. If unbalanced current is measured,
refer to Current Sensor Test (6.3.14).
AF-650 GP and AF-600 FP High Power Service Manual
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