Danfoss VLT MCD 600 Operating Manual page 132

Operating Guide | VLT® Soft Starter MCD 600
12.2.29 Motor Overload
Cause
The motor has reached its maximum thermal capacity. The following can cause overload:
• The soft starter protection settings do not match the motor thermal capacity.
• Excessive starts per hour or start duration.
• Excessive current.
• Damage to the motor windings.
Troubleshooting
• Resolve the cause of the overload and allow the motor to cool.
• Check the following parameters:
- Parameter 1-2 Motor Full Load Current.
- Parameter 1-4 Locked Rotor Time.
- Parameter 1-5 Locked Rotor Current.
Parameter 1-6 Motor Service Factor.
-
- Parameter 5-15 Excess Start Time.
- Parameter 6-10 Excess Start Time.
Parameters 1-4 to 1-6 determine the trip current for motor overload protection. The default settings of parameters 1-4 to 1-6
provide motor thermal protection Class 10, trip current 105% of FLA, or equivalent.
12.2.30 Motor Thermistor
Cause
The motor thermistor input has been enabled and:
• The resistance at the thermistor input has exceeded 3.6 kΩ for more than 1 s.
• The motor winding has overheated. Identify the cause of the overheating and allow the motor to cool before restarting.
• The motor thermistor input has been opened.
If thermistors have previously been connected to the soft starter but are no longer required, use the thermistor reset function
to disable the thermistor.
Troubleshooting
• Check the following parameter:
- Parameter 6-17 Motor Overtemperature.
• Use the thermistor reset function to disable the thermistor circuit.
• Check for a short circuit across terminals TER-05, TER-06.
132 | Danfoss A/S © 2018.10
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Troubleshooting
AQ262141844215en-000202 / 175R1174