Danfoss VLT AutomationDrive FC 302 Operating Instructions Manual page 53

Maintenance, Diagnostics an...
to the motor more accurately and reduces
thermal loading.
WARNING/ALARM 11, Motor thermistor overtemp
Check whether the thermistor is disconnected. Select
whether the frequency converter 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 terminal 18, 19, 31, 32, or 33 (digital
inputs), check that the thermistor is connected
correctly between the digital input terminal used
(digital input PNP only) and terminal 50. Select
the terminal to use in parameter 1-93 Thermistor
Source.
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.
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If torque limit occurs while running, increase the
torque limit. Make sure that the system can
operate safely at a higher torque.
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Check the application for excessive current draw
on the motor.
WARNING/ALARM 13, Over current
The inverter peak current limit (approximately 200% of the
rated current) is exceeded. The warning lasts approximately
1.5 s, then the frequency converter 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 back-up.
If extended mechanical brake control is selected, a trip can
be reset externally.
MG34U402
Operating Instructions
Troubleshooting
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ALARM 14, Earth (ground) fault
There is current from the output phase to ground, either in
the cable between the frequency converter and the motor,
or in the motor itself. Ground fault is detected by the
current transducers that measure current going out from
the frequency converter and current going into the
frequency converter from the motor. Ground fault is issued
if the deviation of the two currents is too large (the
current going out of the frequency converter should be
the same as the current going into the frequency
converter).
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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ALARM 16, Short circuit
There is short-circuiting in the motor or motor wiring.
Troubleshooting
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Remove the power and check if the motor shaft
can be turned.
Check that the motor size matches the frequency
converter.
Check that the motor data is correct in
parameters 1–20 to 1–25.
Remove power to the frequency converter and
repair the ground fault.
Check for ground faults in the motor by
measuring the resistance to ground of the motor
cables and the motor with a megohmmeter.
Reset any potential individual offset in the 3
current transducers in FC 302: perform the
manual initialisation or perform a complete AMA.
This method is most relevant after changing the
power card.
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).
Remove the power to the frequency converter
and repair the short circuit.
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