Siemens SINAMICS PERFECT HARMONY GH180 Function Manual page 452

Troubleshooting Faults and Alarms
11.5 Drive Faults and Alarms Motor/Output Related
Fault display
Mtr therm over load 1
Mtr therm over load 2
Mtr therm over ld fault
Motor over volt alarm
Motor over volt fault
450
Type Enable Potential causes and corrective actions
A SOP Cause
Motor temperature or motor current, depending on choice of over-load
method, are above over-load pending setting.
Action
1. Verify that parameter Overload pending (1139) is set correctly.
2. Check load conditions and, if applicable, verify that submenu Speed
Derate Curve (1151) matches the load conditions.
A SOP Cause
Motor temperature or motor current, depending on choice of over-load
method, are above over-load setting.
Action
Verify that parameter Overload (1140) is set correctly. Refer to Mtr therm
over load 1 section above.
F Fixed Cause
Motor temperature or motor current, depending on choice of over-load
method, has exceeded the over-load setting for the time specified by the
over-load timeout parameter.
Action
Verify that parameter Overload timeout (1150) is set correctly. Refer
to Mtr therm over load 1 section above.
A SOP Cause
If motor voltage exceeds 90% of the motor overvoltage limit in the motor
limit menu.
Action
Check menu settings for correct motor rating, and limit setting.
F SOP Cause
The measured motor voltage exceeds the threshold set by parameter Mo‐
tor trip volts (1160) in the limits menu (1120). An improperly set-up or
tuned drive usually causes this fault. This could include the secondary tap
setting. A high line condition can also cause this.
Action
1. Verify that the motor and drive nameplate settings match the corre‐
sponding parameters in motor parameter menu (1000) and drive pa‐
rameter menu (2000).
2. Verify that the signals on the VMA, VMB, and VMC test points are
operating properly within:
– 3.8 Vrms +/-0.20 V at full speed on the test point board.
If an incorrect voltage is noted, check the voltage divider in the motor
sense unit or replace the system interface board.
3. Also check the tap settings on the transformer. The tap setting may
have to be changed to accommodate a high input line.
NXGPro+ Control Manual
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