Danfoss vlt soft starter mcd 500 Operating Manual page 81

Troubleshooting
Display
Overpower
Parameter out of range
Phase sequence
PLC
Power loss
Pump fault
Starter/communication (between
module and soft starter)
Starter disable
Thermistor cct (thermistor circuit)
Time - overcurrent
Undercurrent
Unsupported option (function not
available in inside delta)
Vibration
MG17K602
Operating Guide
Possible cause/Suggested solution
The motor has experienced a sharp rise in power. Causes can include a momentary overload
condition which has exceeded the adjustable delay time.
Related parameters:
•
2U.
•
2V.
•
16P.
•
A parameter value is outside the valid range.
The soft starter loads the default value for all affected parameters. To go to the first invalid
parameter and adjust the setting, press [Main Menu].
Related parameters: None.
The phase sequence on the soft starter mains terminals (L1, L2, L3) is not valid.
Check the phase sequence on L1, L2, L3, and ensure that the setting in parameter 2-1 Phase
Sequence is suitable for the installation.
Related parameters:
Parameter 2-1 Phase Sequence.
Name selected for a programmable input. Refer to Input A trip.
The soft starter is not receiving mains supply on 1 or more phases when a start command is
given.
Check that the main contactor closes when a start command is given and remains closed until the
end of a soft stop.
If testing the soft starter with a small motor, it must draw at least 2% of its minimum FLC setting
on each phase.
Related parameters: None.
Name selected for a programmable input. Refer to Input A trip.
•
There is a problem with the connection between the soft starter and the optional communi-
cations module. Remove and reinstall the module. If the problem persists, contact the local
distributor.
•
There is an internal communication error within the soft starter. Contact the local distributor.
Related parameters:
•
Parameter 16-10 Starter/Comms.
Name selected for a programmable input. Refer to Input A trip.
The thermistor input has been enabled and:
•
The resistance at the input has dropped below 20 Ω (the cold resistance of most thermistors is
above this value) or
•
A short circuit has occurred. Check and resolve this condition.
Check that a PT100 (RTD) is not connected to terminals 05 and 06.
Related parameters: None.
The soft starter is internally bypassed and has drawn high current during running. (The 10 A
protection curve trip has been reached, or the motor current has risen to 600% of the motor FLC
setting.)
Related parameters: None.
The motor has experienced a sharp drop in current, caused by loss of load. Causes can include
broken components (shafts, belts, or couplings) or a pump running dry.
Related parameters:
•
Parameter 2-4 Undercurrent.
•
Parameter 2-5 Undercurrent Delay.
•
Parameter 16-3 Undercurrent.
The selected function is not available (for example jog is not supported in inside delta configu-
ration).
Related parameters: None.
Name selected for a programmable input. Refer to Input A trip.
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