Display Possible cause/Suggested solution
Power Loss 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
Secondary Motor Fail Control voltage has been applied to the MCD 500 with a link across input A (11, 16).
The default function for input A is Motor Set Select. Remove the link, change the setting for Par. 3-3 then
replace the link.
Related Pars.: 3-3
Starter/Comms - 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
Thermistor Cct 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.
Time - Overcurrent 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
Undercurrent 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
Unsupported Option The selected function is not available (e.g. jog is not supported in inside delta configuration).
Related Pars.: None
MCD 500 Service Manual 2 Troubleshooting
MG.17.L1.02 - VLT
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is a registered Danfoss trademark
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