Danfoss VLT AutomationDrive FC 302 Operating Manual page 87

Maintenance, Diagnostics, a...
Select 1 of these options:
•
The drive issues a warning or an alarm when the
counter is >90% if parameter 1-90 Motor Thermal
Protection is set to warning options.
•
The drive 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.
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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 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 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 drive 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.
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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 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.
MG34U502
Operating Guide
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 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 back-up.
If extended mechanical brake control is selected, a trip can
be reset externally.
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 drive and the motor, or in the
motor itself. The current transducers detect the ground
fault by measuring current going out from the drive and
current going into the drive from the motor. Ground fault
is issued if the deviation of the 2 currents is too large. The
current going out of the drive must be the same as the
current going into the drive.
Troubleshooting
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ALARM 15, Hardware mismatch
A fitted option is not operational with the present control
card hardware or software.
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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 power to the drive.
Check that the motor shaft can be turned.
Check that the motor size matches the drive.
Check that the motor data is correct in
parameters 1-20 to 1-25.
For parallel drive systems, check for output cable
imbalances in size and length between phases
and between drive modules.
Remove power to the drive 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 drive. Perform the
manual initialization or perform a complete AMA.
This method is most relevant after changing the
power card.
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