Danfoss VLT FC Series Service Manual page 80

Troubleshooting
ALARM 244, Heat sink temperature
The maximum temperature of the heat sink has been
exceeded. The temperature fault cannot reset until the
temperature drops below a 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 conditions:
•
Ambient temperature too high.
•
Motor cables too long.
•
Incorrect airflow clearance above or below the AC
drive.
•
Blocked airflow around the unit.
6 6
•
Damaged heat sink fan.
•
Dirty heat sink.
ALARM 245, Heat sink sensor
No feedback from the heat sink temperature sensor. The
signal from the IGBT thermal sensor is not available on the
power card. This alarm is equivalent to alarm 39, Heat sink
sensor. The report value in the alarm log indicates which
drive module generated the alarm:
1 = Left drive module.
2 = Second drive module from left.
3 = Third drive module from left (in 4-module
module systems).
4 = Fourth drive module from left (in 4-module
module systems).
Troubleshooting
Check the following:
•
Power card.
•
Gate drive card.
•
Ribbon cable between the power card and the
gate drive card.
ALARM 246, Power card supply
This alarm is only for multi-drive systems. It is equivalent to
alarm 46, Power card supply. The report value in the alarm
log indicates which drive module generated the alarm:
1 = Left drive module.
2 = Second drive module from left.
3 = Third drive module from left (in 4-module
module systems).
4 = Fourth drive module from left (in 4-module
module systems).
ALARM 247, Power card temperature
This alarm is only for multi-drive systems. It is equivalent to
alarm 69, Power card temperature. The report value in the
alarm log indicates which drive module generated the
alarm:
78
®
VLT FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
ALARM 248, Illegal power section configuration
This alarm is only for multi-drive systems. It is equivalent to
alarm 79, Illegal power section configuration. The report
value in the alarm log indicates which drive module
generated the alarm:
Troubleshooting
Check the following:
•
WARNING 250, New spare part
The power or switch mode supply has been exchanged.
Restore the drive type code in the EEPROM. Select the
correct type code in parameter 14-23 Typecode Setting
according to the label on the drive. Remember to select
Save to EEPROM at the end.
WARNING 251, New type code
The power card or other components have been replaced
and the type code has been changed.
Troubleshooting
•
ALARM 421, Temperature fault
A fault caused by the on-board temperature sensor is
detected on the fan power card.
Troubleshooting
•
•
•
ALARM 422, Communication fault
A fan power card (FPC) communication failure is detected.
The alarm report value indicates which card generated the
fault, and whether the fault is upstream or downstream. A
value <100 indicates upstream card communication failure.
A value >100 indicates a downstream card communication
failure. A report value of 255 indicates that the control card
generated the fault.
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1 = Left drive module.
2 = Second drive module from left.
3 = Third drive module from left (in 4-module
module systems).
4 = Fourth drive module from left (in 4-module
module systems).
1 = Left drive module.
2 = Second drive module from left.
3 = Third drive module from left (in 4-module
module systems).
4 = Fourth drive module from left (in 4-module
module systems).
The current scaling cards on the MDCIC.
Reset to remove the warning and to resume
normal operation.
Check wiring.
Check sensor.
Replace fan power card.
MG94A502