3-10
VLT is a registered Danfoss trademark
WARNING 27
BRAKE IGBT FAULT
(Not applicable for the VLT 4000/6000/8000.)
The brake transistor is shorted. As a result of the shorted
transistor substantial power may be transmitted to the brake
resistor.
Disconnect main input power to the VLT. Perform Brake IGBT
Test (5.2.11) in Section 5.
ALARM 29
HEAT SINK OVER TEMP
The heatsink temperature has exceeded its limit. (See ratings
tables in introduction section of this manual.) This fault results
in a Trip Locked condition.
The drive will also trip when any of the following conditions
occur:
Ambient temperature is above 140°F (60°C) or below
-4°F (-20°C).
The drive is not on +24V backup and the power supply
voltage is out of range. (Backup power is not monitored
by the drive.)
The enable/disable connector FK102 is not installed. This
connector has a shorting wire and is used for the external
brake resistor switch. It also disables the SCR front end.
Possible causes are: defective cooling fan, blocked heat sink
or air flow path, defective thermal sensor, missing bottom gland
plate.
Check fan operation. Check for airflow blockage. Check for
proper clearance above and below drive (see Instruction
Manual). Check fan filters (NEMA 12 units). Perform Heatsink
Temperature Sensor Test (5.1.6) in Section 5. Install bottom
gland plate.
ALARM 30
MISSING MOT. PHASE U
The unit has detected an open circuit in the U phase.
This fault may be manually reset.
Parameter 234 (VLT 5000 only) can disable the tripping or
missing motor phase.
This can be due to a faulty connection between drive and
motor, or a faulty motor.
Check motor wiring.
See Output Phase Imbalance Test (5.2.8) in Section 5.
ALARM 31
MISSING MOT. PHASE V
The unit has detected an open circuit in the V phase.
This fault may be manually reset.
Parameter 234 (VLT 5000 only) can disable the tripping or
missing motor phase.
This can be due to a faulty connection between drive and
motor, or a faulty motor.
Check motor wiring.
See Output Phase Imbalance Test (5.2.8) in Section 5.
ALARM 32
MISSING MOT. PHASE W
The unit has detected an open circuit in the W phase.
This fault may be manually reset.
Parameter 234 (VLT 5000 only) can disable the tripping or
missing motor phase.
This can be due to a faulty connection between drive and
motor, or a faulty motor.
Check motor wiring.
See Output Phase Imbalance Test (5.2.8) in Section 5.
WARNING/ALARM 34
PROFIBUS COMMUNICATION FAULT
The Profibus option is no longer communicating.
A trip can be manually reset.
In a warning state this may indicate the cable has been
disconnected or the master (PLC) has stopped.
In an alarm state it may indicate the option card is disturbed
by noise or possibly defective.
Check connections on serial communication cable. Check PLC.
WARNING 35
OUT OF FREQ. RANGE
(Not applicable for the VLT 4000/6000/8000.)
This warning will only be displayed when operating in Process
Closed Loop and the output frequency of the drive is above or
below the limits programmed in parameters 201 and 202.
Parameter 455 can be programmed to disable this warning.
This warning could indicate a loss of feedback or an undesired
condition in the regulation process.
Check connections in feedback circuit. Check process
operation.
Note: Some applications may be designed to operate normally
in this mode. No action is necessary in this case.
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