11.4 Drive Faults and Alarms Input Line Disturbance
Handling Input Line Disturbance Faults
Table 11-3 Input line disturbance faults
Fault display Type Enable Potential causes and corrective actions
Input phase loss A Fixed Cause
Loss of input phase.
Action
1. Check the input fuses and connection to verify that the input phases
are connected properly.
2. Use an oscilloscope to verify the presence of all three input
voltages VIA, VIB, VIC on the test point board. The test point board
must rst be installed.
Input ground A Fixed Cause
The estimated input ground voltage is greater than the limit set by the
ground fault limit in the drive protection menu.
Action
1. Use an oscilloscope to verify the symmetry (L-L and L-N) of the three
input voltages VIA, VIB, VIC on the test point board.
2. Use a voltmeter to check for common mode DC to neutral.
Line over voltage 1 A SOP Cause
The drive-input RMS voltage is greater than 110% of the drive rated input
voltage.
Action
Use a voltmeter to verify that the input voltages VIA, VIB, VIC are the
expected value for the rated voltage:
• NXGpro test point board: VIA, VIB, VIC ~3.8 Vrms. Values greater than
~4.2 Vrms will trigger this alarm.
Note: This alarm can be caused by a transient condition, and may not be
present when making the measurements.
Line over voltage 2 A SOP Cause
The dive input RMS voltage is greater than 115% of the drive rated input
voltage.
Action
Use a voltmeter to verify that the input voltages VIA, VIB, VIC are the
expected value for the rated voltage:
• NXGpro test point board: VIA, VIB, VIC values greater than 4.37 Vrms
will trigger this alarm.
Troubleshooting Faults and Alarms
11.4 Drive Faults and Alarms Input Line Disturbance
NXGPro+ Control Manual
Operating Manual, A5E50491925A 445
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