Fault display Type Enable Potential causes and corrective actions
In torque limit A SOP Cause
This alarm is issued when the drive is in speed rollback, due to a torque
limit condition, for more than 1 minute.
Action
1. Check load conditions.
2. Check proper settings for drive and motor ratings.
In torq limit rollback F/A SOP Cause
This fault or alarm, depending on the SOP, is issued when the drive is in
speed rollback, due to a torque limit condition, for more than 30 minutes.
Action
1. Check load conditions
2. Check proper settings for drive and motor ratings.
Minimum speed trip F/A SOP Cause
Motor speed is below the zero speed setting (2200). This is either due to
a motor stall condition, if speed demand is higher than the zero speed
setting, or a low speed demand condition, where speed demand is lower
than the zero speed setting.
Action
Increase motor torque limit (1190, 1210 or 1230) if it is a stall condition
or adjust the zero speed setting to avoid the desired low speed operating
region.
Loss of eld current F/A SOP Cause
This occurs only with synchronous motor control due to eld exciter failure
or loss of power to the exciter.
Action
Check if the power supply to the exciter is energized. To determine if the
eld exciter is operating correctly:
• reduce Flux demand (3150) to 0.40, increase Accel time 1 (2270) to a
larger value and run the motor with 5% speed demand.
If the drive magnetizing current reference (I
ds,ref
) does not go to zero,
then the eld exciter is not working or is not adjusted properly.
Troubleshooting Faults and Alarms
11.5 Drive Faults and Alarms Motor/Output Related
NXGPro+ Control Manual
452 Operating Manual, A5E50491925A
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