WARNING/ALARM 12, Torque limit
The torque is higher than the value in par. 4-16
Torque Limit Motor Mode
(in motor operation) or
the torque is higher than the value in par. 4-17
Torque Limit Generator Mode
(in regenerative
operation). par. 14-25
Trip Delay at Torque Limit
can be used to change this from a warning only
condition to a warning followed by an alarm.
See section 5.1 for troubleshooting.
WARNING/ALARM 13, Overcurrent
The inverter peak current limit (approx. 200% of the rated current) is exceeded. The warning lasts
about 1.5 sec. Then the adjustable frequency drive trips and issues an alarm. If extended me-
chanical brake control is selected, trip can be reset externally.
Troubleshooting:
This fault may be caused by shock loading or fast acceleration with high inertia loads.
Turn off the adjustable frequency drive. Check if the motor shaft can be turned.
Make sure that the motor size matches the adjustable frequency drive.
Incorrect motor data in parameters 1-20 through 1-25.
See section 1.9 for current trip points.
ALARM 14, Ground fault
There is a discharge from the output phases to ground, either in the cable between the adjustable
frequency drive and the motor or in the motor itself.
See section 1.9 for trip levels.
Troubleshooting:
Turn off the adjustable frequency drive and remove the ground fault.
Measure the resistance to ground of the motor leads and the motor with a megohmmeter
to check for ground faults in the motor.
Perform the current sensor test (section 6.3.14).
See section 5.2 for more details.
ALARM 15, Hardware mismatch
A fitted option is not operational with the present control board hardware or software.
Record the value of the following parameters and contact your Danfoss supplier:
par. 15-40
FC Type
par. 15-41
Power Section
par. 15-42
Voltage
par. 15-43
Software Version
par. 15-45
Actual Typecode String
par. 15-49
SW ID Control Card
par. 15-50
SW ID Power Card
par. 15-60
Option Mounted
par. 15-61
Option SW Version
(for each option slot)
ALARM 16, Short circuit
There is short-circuiting in the motor or on the motor terminals.
Turn off the adjustable frequency drive and remove the short circuit.
See section 1.9 for trip levels.
4 Troubleshooting
High Power Service Manual for VLT
®
FC Series
Adjustable Frequency Drives
4-12
MG.90.L1.22 - VLT
®
is a registered Danfoss trademark
4
Summary of Contents for VLT HVAC FC 100
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