Danfoss VLT AutomationDrive FC 302 Instruction Manual page 55

Maintenance, Diagnostics an...
The fault occurs when the motor runs with more than
100% overload for too long.
Troubleshooting
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Check for motor overheating.
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Check if the motor is mechanically overloaded.
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Check that the motor current set in
parameter 1-24 Motor Current is correct.
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Ensure that the motor data in parameters 1-20 to
1-25 are set correctly.
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If an external fan is in use, check that it is
selected in parameter 1-91 Motor External Fan.
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Running AMA in parameter 1-29 Automatic Motor
Adaptation (AMA) tunes the adjustable frequency
drive to the motor more accurately and reduces
thermal loading.
WARNING/ALARM 11, Motor thermistor overtemp
Check whether the thermistor is disconnected. Select
whether the adjustable frequency drive issues a warning or
an alarm in parameter 1-90 Motor Thermal Protection.
Troubleshooting
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Check for motor overheating.
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Check if the motor is mechanically overloaded.
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When using terminal 53 or 54, check that the
thermistor is connected correctly between either
terminal 53 or 54 (analog voltage input) and
terminal 50 (+10 V supply). Also check that the
terminal switch for 53 or 54 is set for voltage.
Check that parameter 1-93 Thermistor Source
selects terminal 53 or 54.
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When using digital inputs 18 or 19, check that
the thermistor is connected correctly between
either terminal 18 or 19 (digital input PNP only)
and terminal 50. Check that
parameter 1-93 Thermistor Source selects terminal
18 or 19.
WARNING/ALARM 12, Torque limit
The torque has exceeded the value in
parameter 4-16 Torque Limit Motor Mode or the value in
parameter 4-17 Torque Limit Generator Mode.
Parameter 14-25 Trip Delay at Torque Limit can change this
warning from a warning-only condition to a warning
followed by an alarm.
Troubleshooting
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If the motor torque limit is exceeded during
ramp-up, extend the ramp-up time.
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If the generator torque limit is exceeded during
ramp-down, extend the ramp-down time.
MG34U422
Instruction Manual
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WARNING/ALARM 13, Overcurrent
The inverter peak current limit (approximately 200% of the
rated current) is exceeded. The warning lasts approximately
1.5 s, then the adjustable frequency drive trips and issues
an alarm. Shock loading or quick acceleration with high-
inertia loads can cause this fault. If the acceleration during
ramp-up is quick, the fault can also appear after kinetic
backup.
If extended mechanical brake control is selected, a trip can
be reset externally.
Troubleshooting
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ALARM 14, Ground fault
There is current from the output phases to ground, either
in the cable between the adjustable frequency drive and
the motor or in the motor itself.
Troubleshooting
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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
Danfoss:
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Danfoss A/S © 06/2015 All rights reserved.
If torque limit occurs while running, increase the
torque limit. Make sure that the system can
operate safely at a higher torque.
Check the application for excessive current draw
on the motor.
Remove the power and check if the motor shaft
can be turned.
Make sure that the motor size matches the
adjustable frequency drive.
Check that the motor data is correct in
parameters 1–20 to 1–25.
Remove power to the adjustable frequency drive
and repair the ground fault.
Check for ground faults in the motor by
measuring the resistance to ground of the motor
leads and the motor with a megohmmeter.
Parameter 15-40 FC Type
Parameter 15-41 Power Section
Parameter 15-42 Voltage
Parameter 15-43 Software Version
Parameter 15-45 Actual Typecode String
Parameter 15-49 SW ID Control Card
Parameter 15-50 SW ID Power Card
Parameter 15-60 Option Mounted
Parameter 15-61 Option SW Version (for each
option slot)
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