Danfoss VLT MCD 600 Operating Manual page 129

VLT® Soft Starter MCD 600
Operating Guide
11.2.32 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.
11.2.33 Network Communication
Cause
The network master has sent a trip command to the soft starter, or there could be a network communication problem.
Troubleshooting
• Check the network for causes of communication inactivity.
• Check the following parameter:
- Parameter 6-13 Network Communications.
11.2.34 Not Ready
Cause
• The reset input may be active. If the reset input is active, the soft starter does not operate.
•
The soft starter may be waiting for the restart delay to elapse. The length of the restart delay is controlled by parameter 5-16
Restart Delay.
• Check the following parameter:
-
Parameter 5-16 Restart Delay.
11.2.35 Overcurrent
Cause
The overcurrent has exceeded the level set in parameter 5-5 Overcurrent for longer than the time set in parameter 5-6 Overcurrent
Delay. Causes can include a momentary overload condition.
Troubleshooting
• Check the following parameters:
- Parameter 5-5 Overcurrent.
-
Parameter 5-6 Overcurrent Delay.
-
Parameter 6-5 Overcurrent.
11.2.36 Overpower
Cause
The motor has experienced a sharp rise in power. Causes can include a momentary overload condition, which has exceeded the
adjustable delay time.
Troubleshooting
• Check the following parameters:
Danfoss A/S © 2020.12
N O T I C E
Troubleshooting
AQ262141844215en-000401 / 175R1174 | 125