Danfoss vlt soft starter mcd 500 Operating Manual page 80

Troubleshooting
Display
Low level
Low pressure
Motor overload/
Motor 2 overload
Motor connection tx
10 10
Motor thermistor
Network communication (between
module and network)
No flow
Not ready
78
®
VLT Soft Starter MCD 500
Possible cause/Suggested solution
Name selected for a programmable input. Refer to Input A trip.
Name selected for a programmable input. Refer to Input A trip.
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.
•
Excessive throughput.
•
Damage to the motor windings.
Resolve the cause of the overload and allow the motor to cool.
Related parameters:
•
Parameter 1-1 Motor Full Load Current.
•
Parameter 1-2 Locked Rotor Time.
•
Parameter 1-3 Start Mode.
•
Parameter 1-4 Current Limit.
•
Parameter 7-1 Motor FLC-2.
•
Parameter 7-2 Locked Rotor Time-2.
•
Parameter 7-3 Start Mode-2.
•
Parameter 7-4 Current Limit-2.
•
Parameter 16-1 Motor Overload.
Where X is 1, 2, or 3.
The motor is not connected correctly to the soft starter for in-line or inside delta use.
•
Check individual motor connections to the soft starter for power circuit continuity.
•
Check connections at the motor terminal box.
This trip is not adjustable.
Related parameters:
•
Parameter 15-7 Motor Connection.
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.
NOTICE
If a valid motor thermistor is no longer used, fit a 1.2 kΩ resistor across terminals 05
and 06.
Related parameters:
•
Parameter 16-9 Motor Thermistor.
The network master has sent a trip command to the soft starter, or there could be a network
communication problem.
Check the network for causes of communication inactivity.
Related parameters:
•
Parameter 16-11 Network/Comms.
Name selected for a programmable input. Refer to Input A trip.
Check input A (terminals 11 and 16). Check if the soft starter disable function is active. If
parameter 3-3 Input A Function is set to Starter disable and there is an open circuit on terminals 11
and 16, the soft starter does not start.
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