Danfoss MCD500 Service Manual page 9

Troubleshooting
Display
Power Loss
2 2
Starter/Comms
Thermistor Cct
Time - Overcurrent
Undercurrent
Unsupported Option
8
MCD 500 Service Manual
Possible cause/Suggested solution
The starter is not receiving mains supply on one 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.
Related Pars.: 15-5
- There is a problem with the connection between the soft starter and the optional communications
module. Remove and reinstall the module. If the problem persists, contact your local distributor.
- There is an internal communications error within the soft starter. Contact your local distributor.
Related Pars.: 16-10
The thermistor input has been enabled and:
- The resistance at the input has fallen below 20 Ω (the cold resistance of most thermistors will be
over this value) or
- A short circuit has occurred. Check and resolve this condition.
Check that a PT100 (RTD) is not connected to 05, 06.
Related Pars.: None.
The MCD 500 is internally bypassed and has drawn high current during running. (The 10A protection
curve trip has been reached or the motor current has risen to 600% of the motor FLC setting.)
Related Pars.: 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 Pars.: 2-4, 2-5, 16-3
The selected function is not available (e.g. jog is not supported in inside delta configuration).
Related Pars.: None
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