VLT
®
Series 3500
104
CONTROL0CARD0000
FAULTOXXXXX00000
Start-up Test (CONTROL CARD FAULT)
The drive carries out a self-test of the control card when-
ever the AC power is applied. The following message may
appear:
This message indicates a control card problem. Contact a
Danfoss service center.
The following faults indicate an operational problem that
caused the Inverter to fault trip to protect itself or the motor
from possible damage. The cause of the fault must be
found and eliminated.
Inverter Fault
The power section of the drive is defective.
Overvoltage
The voltage in the DC bus is too high. Possible
causes include:
Input voltage too high
Transients on the input
Regenerative motor operation
NOTE: When the drive decelerates, energy from the motor
is returned to the drive (regenerative operation), which
charges the intermediate circuit. If this is the cause of the
overvoltage fault, the ramp time can be extended using pa-
rameters 216 and 218 until the fault does not occur.
Undervoltage
The voltage of the DC bus is too low. Possible causes in-
clude:
•
Input voltage too low
•
Failure of the charging circuit/rectifier of the drive
Before calling for service, check the input line voltage.
Overcurrent
This fault indicates that upper limit of the rectifier peak cur-
rent has been exceeded, possibly because of a short circuit
in the output of the drive.
Before calling for service, check for an output short circuit.
Ground Fault
This indicates a ground fault on the drive’s output. Check
motor and motor wiring for ground fault problems.
It is also possible that the motor wiring is too long. Motor
wiring should always be as short as possible, and never
over 1,000 feet long. Reducing the output carrier frequency
down to 4.5 kHz or lower may eliminate a ground fault prob-
lem caused by excessive motor lead length.
Critical Temperature
The temperature inside drive is too high. Possible causes
include:
•
Ambient temperature is above 104
o
F, (40
o
C)
•
The heat sink of the drive is dirty or obstructed
•
The fan(s) is not operating
•
The drive is not mounted vertically directly against a
solid surface
Overload
The electronic thermal overload protection has tripped the
drive. This means that the motor has consumed more than
110% of the rated current of the drive for too long. Reduce
the motor load. If this is not possible, the application may
require a larger drive. Be sure that the motor is not also
overloaded before installing a larger drive.
Motor Trip
The motor electronic thermal relay (ETR) protection is ac-
tive. This means that the current consumed by the motor at
low speed has been too high for too long. It indicates that
the motor has been loaded excessively at low speed. Try to
reduce the load at low speed or make the motor run at a
higher speed. If this not possible, the motor must be re-
placed with a larger one or extra cooling must be provided
for the existing motor. The electronic motor protection can
be turned off in parameter 315, but at the risk of burning up
the motor. If a thermostat or thermistor is installed in the
motor’s windings, this can be used to provide motor thermal
protection by setting parameter 400 to thermistor and wiring
the thermostat or thermistor between terminals 50 and 16.
WARNING
!
Turning off the electronic thermal motor protection will pre-
vent the drive from monitoring motor temperature. The mo-
tor may overheat.
