Danfoss VLT FC 102 Operating Manual page 69

VLT HVAC Drive FC 102
Operating Guide
7.6.8 WARNING/ALARM 9, Inverter Overload
Cause
The drive has run with more than 100% overload for too long and is about to cut out. The counter for electronic thermal inverter
protection issues a warning at 98% and trips at 100% with an alarm. The drive cannot be reset until the counter is below 90%.
Troubleshooting
• Compare the output current shown on the LCP with the drive rated current.
• Compare the output current shown on the LCP with the measured motor current.
• Show the thermal drive load on the LCP and monitor the value.
- When running above the drive continuous current rating, the counter increases.
- When running below the drive continuous current rating, the counter decreases.
7.6.9 WARNING/ALARM 10, Motor Overload Temperature
Cause
According to the electronic thermal protection (ETR), the motor is too hot.
This warning/alarm is controlled by parameter 1-90 Motor Thermal Protection:
• If the parameter is set to warning options, the drive issues a warning or an alarm when the counter is >90%.
• If the parameter is set to trip options, the drive trips when the counter reaches 100%.
The fault occurs when the motor runs with more than 100% overload for too long.
Troubleshooting
• Check for motor overheating.
• Check whether 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.
•
Run AMA in parameter 1-29 Automatic Motor Adaptation (AMA). This tunes the drive to the motor more accurately and reduces
thermal loading.
7.6.10 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.
7.6.11 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.
Danfoss A/S © 2023.09
Diagnostics and Troubleshooting
AQ267037536117en-000101 / 130R0083 | 69