ABB ACS2000 DFE, User Manual

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10-6 (32) 2UEA001270 Rev. F ACS2000 User manual
Chapter 10 - Troubleshooting and maintenance
10.3.4 Malfunctioning grounding switch
CAUTION
If the control circuit of the grounding switch malfunctions, it is possible that
the grounding switch is closed while the DC link is still charged, and
because of that, the DC capacitors are short-circuited. The short-circuit
will manifest itself in a loud bang. To prevent temporary minor hearing
impairment, follow the instructions below.
When the DC link of the drive has been de-energized, the GROUND SW
RELEASED pilot light illuminates to indicate that the grounding switch is
released and can be turned to the grounded position. If the release pilot
light does not illuminate and there is reason to assume that the grounding
circuit is malfunctioning, proceed as follows:
1 Do not try with force to turn the grounding switch in any direction.
The handle and/or the switch could be damaged or broken if force is
used.
2 Verify that the MV switchgear is in the open position.
3 Check the drive status on the CDP control panel.
The message ReadyOn is displayed when the DC link of the drive
has been discharged.
4 Verify that the DC link has been discharged.
The discharging level can be viewed in parameter 2.01 DC
VOLTAGE. The value should be below 50 V.
5 Check if there are any alarm and fault messages on the display.
If there are any, look up the messages in Appendix N -
Troubleshooting guide, located on the CD, and follow the instructions.
6 Try to rectify the reason for the alarms and faults, and then press the
reset key on the CDP control panel.
1 L -> 0.0 rpm
StateINU ReadyOn
MOTOR SP 0.00 rpm
POWER 0.0 kW