Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual page 69

Diagnostics and Troubleshoo...
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
The thermistor may be 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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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 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.
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If a KTY sensor is used, check for correct
connection between terminals 54 and 55
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If using a thermal switch or thermistor, check that
the programming if 1-93 Thermistor Resource
matches sensor wiring.
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If using a KTY Sensor, check the programming of
parameter 1-95 KTY Sensor Type,
parameter 1-96 KTY Thermistor Resource and
parameter 1-97 KTY Threshold level match sensor
wiring.
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.
MG16I322
Operating Instructions
Troubleshooting
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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 are 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 © 04/2015 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.
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 the ground of the
motor cables and the motor with a
megohmmeter.
Perform current sensor test.
Parameter 15-40 FC Type
Parameter 15-41 Power Section
Parameter 15-42 Voltage
Parameter 15-43 Software Version
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