Danfoss VLT HVAC Drive FC 102 Operating Manual page 123

Maintenance, Diagnostics, and
Operating Guide | VLT® HVAC Drive FC 102
Troubleshooting
Troubleshooting
• Cycle power to the drive to determine if the warning/alarm returns.
8.4.89 WARNING/ALARM 122, Mot. Rotat. Unexp.
Cause
The drive performs a function that requires the motor to be at standstill, for example DC hold for PM motors.
8.4.90 WARNING 163, ATEX ETR Cur.Lim.Warning
Cause
The drive has run above the characteristic curve for more than 50 s. The warning is activated at 83% and deactivated at 85% of the
allowed thermal overload.
8.4.91 ALARM 164, ATEX ETR Cur.Lim.Alarm
Cause
Running above the characteristic curve for more than 60 s within a period of 600 s activates the alarm, and the drive trips.
8.4.92 WARNING 165, ATEX ETR Freq.Lim.Warning
Cause
The drive has run for more than 50 s below the allowed minimum frequency (parameter 1-98 ATEX ETR Interpol. Points Freq.).
8.4.93 ALARM 166, ATEX ETR Freq.Lim.Alarm
The drive has run for more than 60 s (in a period of 600 s) below the allowed minimum frequency (parameter 1-98 ATEX ETR Interpol.
Points. Freq.).
8.4.94 ALARM 244, Heat Sink Temperature
Cause
The maximum temperature of the heat sink has been exceeded. The temperature fault cannot reset until the temperature drops below
the defined heat sink temperature. The trip and reset points are different based on the power size. This alarm is equivalent to Alarm 29,
Heat Sink Temp.
Troubleshooting
Check for the following:
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