Danfoss VLT Decentral Drive FCD 302 Operating Manual page 47

VLT® Decentral Drive FCD 302
Operating Guide
6.8.5 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 continuos current rating, the counter decreases.
6.8.6 WARNING/ALARM 10, Motor Overload Temperature
Cause
According to the electronic thermal protection (ETR), the motor is too hot.
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.
• 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.
6.8.7 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.
6.8.8 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.
Danfoss A/S © | 2020.07
Maintenance, Diagnostics and
Troubleshooting
AQ267036816112EN-000101 / 130R0208 | 47