Danfoss VLT AutomationDrive FC 301 Programming Manual page 286

Troubleshooting
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The frequency converter issues a warning or an
alarm when the counter is >90% if
parameter 1-90 Motor Thermal Protection is set to
warning options.
•
The frequency converter trips when the counter
reaches 100% if parameter 1-90 Motor Thermal
Protection is set to trip options.
The fault occurs when the motor runs with more than
100% overload for too long.
Troubleshooting
•
Check for motor overheating.
•
Check if the motor is mechanically overloaded.
•
Check that the motor current set in
6 6
parameter 1-24 Motor Current is correct.
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Ensure that the motor data in parameters 1-20 to
1-25 is set correctly.
•
If an external fan is in use, check that it is
selected in parameter 1-91 Motor External Fan.
•
Running AMA in parameter 1-29 Automatic Motor
Adaptation (AMA) tunes the frequency converter
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
•
Check for motor overheating.
•
Check if the motor is mechanically overloaded.
•
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 Resource
selects terminal 53 or 54.
•
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
Resource.
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.
284
®
VLT AutomationDrive FC 301/302
Troubleshooting
•
•
•
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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.
Troubleshooting
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•
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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. The current transducers detect the
ground fault by measuring 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 2 currents is too large. The current going
out of the frequency converter must be the same as the
current going into the frequency converter.
Troubleshooting
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Danfoss A/S © 01/2018 All rights reserved.
If the motor torque limit is exceeded during
ramp-up, extend the ramp-up time.
If the generator torque limit is exceeded during
ramp-down, extend the ramp-down time.
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.
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 the frequency converter.
Perform the manual initialization or perform a
complete AMA. This method is most relevant
after changing the power card.
MG33MO02