Danfoss VLT FCD 302 Operating Manual page 48

Operating Guide | VLT® Decentral Drive FCD 302
The drive is about to cut out because of an overload (too high current for too long). The counter for electronic, thermal inverter
protection issues a warning at 90% and trips at 100%, while giving an alarm. The drive cannot be reset until the counter is below 90%.
The fault occurs when the drive has run with more than 100% overload for too long.
Troubleshooting
Compare the output current shown on the LCP with the drive rated current.
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Compare the output current shown on the LCP with the measured motor current.
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Show the thermal drive load on the LCP and monitor the value. When running above the drive continuous current rating, the
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counter increases. When running below the drive continuous current rating, the counter decreases.
WARNING/ALARM 10, Motor ETR Overtemperature
Cause
According to the electronic thermal protection (ETR), the motor is too hot. Select whether the drive issues a warning or an alarm when
the counter reaches 100% in parameter 1-90 Motor Thermal Protection. The fault occurs when the motor runs with more than 100%
overload for too long.
Troubleshooting
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 parameter 1-20 to parameter 1-25 is set correctly.
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Running AMA in parameter 1-29 Automatic Motor Adaptation (AMA) tunes the drive to the motor more accurately and reduces
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thermal loading.
WARNING/ALARM 11, Motor Thermistor Overtemperature
Cause
Check whether the thermistor is disconnected. Select whether the drive issues a warning or an alarm in parameter 1-90 Motor Thermal
Protection.
Troubleshooting
Check for motor overheating.
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Check if the motor is mechanically overloaded.
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When using terminal 53 or 54, check that the thermistor is connected correctly between either terminal 53 or 54 (analog voltage
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input) and terminal 50 (+10 V supply). Also check that the terminal switch for 53 or 54 is set for voltage. Check that parameter 1-93
Thermistor Resource selects terminal 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
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terminal used (digital input PNP only) and terminal 50. Select the terminal to use in parameter 1-93 Thermistor Resource.
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.
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If the generator torque limit is exceeded during ramp-down, extend the ramp-down time.
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48 | Danfoss A/S © 2025.04
Operating the Drive
AQ267036816112en-000301 / 130R0208