Danfoss VLT FC 103 Operating Manual page 105

Operating Guide | VLT® Refrigeration Drive FC 103
Troubleshooting
• Check for motor overheating.
• Check if the motor is mechanically overloaded.
• Check that the motor current set in parameter 1-24 Motor Current is correct.
• 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.
8.4.11 WARNING/ALARM 11, Motor Thermistor Overtemp
The motor thermistor indicates that the motor temperature is too high.
Troubleshooting
• Check for motor overheating.
• Check that the thermistor is securely connected.
• 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 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 terminal 50. Select the terminal to use in parameter 1-93 Thermistor Resource.
8.4.12 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.
8.4.13 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 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.
Danfoss A/S © 2020.01
Maintenance, Diagnostics, and
Troubleshooting
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