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If an external fan is in use, check that it is selected in parameter 1-91 Motor External Fan.
Run AMA in parameter 1-29 Automatic Motor Adaptation (AMA). This tunes the drive to the motor more accurately and reduces
thermal loading.
9.4.12 WARNING/ALARM 11, Motor Thermistor Overtemp
Cause
The motor thermistor indicates that the motor temperature is too high.
Troubleshooting
Check for motor overheating.
Check that the thermistor is securely connected.
Check whether 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).
Check that the terminal switch for 53 and 54 is set for voltage.
Check that parameter 1-93 Thermistor Resource selects 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 termi-
nal 50.
Select the terminal to use in parameter 1-93 Thermistor Resource.
9.4.13 WARNING/ALARM 12, Torque Limit
Cause
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
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 time, 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.
9.4.14 WARNING/ALARM 13, Overcurrent
Cause
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 accelera-
tion 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
Remove power and check if 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.
9.4.15 ALARM 14, Earth (Ground) Fault
Cause
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 sensors detect the ground fault by measuring current going out from the drive and current going into the drive from the
AQ262141314214en-000301 / 130R0880138 | Danfoss A/S © 2021.11
Maintenance, Diagnostics, and
Troubleshooting
VLT® HVAC Drive FC 102
Operating Guide
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