ABB ACS6000 Inverter IGCT Phase Module Replacement and Maintenance Guide

Both LEDs are off: the auxiliary power supply is missing.

4. Manual output isolation (MOI) status indication:

For drivers with redundant or semi redundant configurations, the status of the output isolator can be determined through LED6-9 on input module A2511 in the COUP control cabinet

LED 6&7 (controlling INO2):

LED6=ON, LED7=OFF ->connection is normal.

LED6=OFF, LED7=ON ->disconnected.

LED 8&9 (controlling INO1):

LED8=ON, LED9=OFF ->connection is normal.

LED8=OFF, LED9=ON ->disconnected.

LED6=OFF, LED7=OFF or LED8=OFF, LED9=OFF are invalid configurations, and the frequency converter cannot start.

Other key maintenance work

Test the 'white indicator light': This light is a safety indicator for 'DC bus grounded'. If it doesn't light up before opening the door, press the light cap first for testing. If the light can come on, it indicates a fault in the release circuit; If the light does not turn on, it indicates a malfunction in the bulb or test circuit. At this time, the light should not be relied on, but a voltage detector should be used to verify.

Replace the air cooling unit: For auxiliary fans inside the control cabinet (COUP) or water-cooled cabinet (WCU), or for top mounted air-to-air heat exchangers, the fan unit is designed to be modular and replaceable. During maintenance, simply disconnect the power supply of the corresponding miniature circuit breaker, remove the fixing screws, extract the faulty fan unit as a whole, and replace it with a new unit.

Inspection and fastening: Vibration may cause loose electrical connections. Regularly check the connections of all power and control cables, and re tighten them to the specified values using a torque wrench. For DC bus capacitors, do not exceed a torque of 20 Nm to prevent damage to their insulation sleeves.