Siemens SINAMICS PERFECT HARMONY GH180, Function Manual

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11.5 Drive Faults and Alarms Motor/Output Related
Handling Motor/Output Related Faults
Table 11-4 Motor/output related faults
Fault display Type Enable Potential causes and corrective actions
Over speed alarm A SOP Cause
The motor speed is greater than 95% of parameter setting for Overspeed
(1170) in the limits menu (1120). An improperly set-up or mistuned drive
usually causes this fault.
Action
Verify that the motor and drive nameplate settings match the correspond‐
ing parameters in motor parameter menu (1000) and drive parameter
menu (2000).
Over speed fault F Fixed Cause
The motor speed exceeds the parameter setting for Overspeed (1170) in
the limits menu (1120). An improperly set-up or mistuned drive usually
causes this fault.
Action
Verify that the motor and drive nameplate settings match the correspond‐
ing parameters in motor parameter menu (1000) and drive parameter
menu (2000).
Output ground fault A Fixed Cause
This fault is caused due to an output ground fault condition, when the
estimated ground voltage exceeds parameter Ground Fault Limit (1245)
in the limits menu (1120).
Action
1. Use an oscilloscope and the test point board to verify proper symmetry
of the input voltages and currents: VMA, VMB, and VMC. If voltages
are not a problem, check the divider resistors in the motor sense unit
or replace the system interface board.
2. Disconnect the motor from the VFD. Use a megometer to verify motor
and cable insulation.
Encoder loss Menu Menu Cause
The software has detected an encoder signal loss due to a faulty encoder
or faulty encoder interface.
Action
1. Verify that the information in the encoder menu (1280) is correct for
the encoder being used.
2. Run the drive in open loop vector control mode. Select OLVC in the
control loop type (2050) of the drive parameter menu (2000).
3. Go to meter menu (8); select display parameters menu (8000) and set
one of the display parameters (8001-8004) to ERPM or %ESP and ob‐
serve if ERPM follows motor speed.
Troubleshooting Faults and Alarms
11.5 Drive Faults and Alarms Motor/Output Related
Control Manual
Operating Manual, A5E50491925A
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