Symptom Probable Cause
A reset does not occur after an Auto-Reset, when
using a remote 2-wire control.
- The remote 2-wire start signal must be removed and reapplied for a re-start.
Remote start/stop command is overriding Auto
Start/Stop settings when using remote 2-wire con-
trol.
- Auto Start/Stop function should only be used in HAND ON mode or in tandem with HAND OFF
mode, 3 and 4-wire control.
After selecting AAC the motor used an ordinary
start and/or the second start was different to the
first.
- The first AAC start is current limit so that the starter can learn from the motor characteristics.
Subsequent starts use AAC.
Non-resettable THERMISTOR FAIL trip, when
there is a link between Thermistor input 05, 06 or
when the motor thermistor connected between
05, 06 is permanently removed.
- The thermistor input is enabled once a link is fitted and short circuit protection has activated.
Remove the link then load the default parameter set. This will disable the thermistor input and
clear the trip.
Place a 1k2 Ω resistor across the thermistor input.
Turn thermistor protection to 'Log only' (Par. 16-9).
Parameter settings cannot be stored. - Make sure you are saving the new value by pressing the OK button after adjusting a param-
eter setting. If you press BACK, the change will not be saved.
- Check that the adjustment lock (Par. 15-2) is set to Read/Write. If the adjustment lock is on,
settings can be viewed but not changed. You need to know the security access code to change
the adjustment lock setting.
- The EEPROM may be faulty on the LCP or the Main Control PCB. A faulty EEPROM will also
trip the soft starter, and the LCP will display the message EEPROM Fail. Contact your local
supplier for advice.
MCD 500 Service Manual 2 Troubleshooting
MG.17.L1.02 - VLT
®
is a registered Danfoss trademark
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