AuCom MVE Series User Manual page 71

TROUBLESHOOTING
Symptom
The soft starter does not respond
to a start command from either
the local or remote controls.
Motor does not reach full speed.
Erratic motor operation.
Soft stop ends too quickly.
Remote start/stop command is
overriding Auto-Stop settings
when using remote two-wire
control.
Parameter settings cannot be
stored.
ATTENTION! Remove Mains Volts •
Current values shown on the
display are incorrect.
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| MVE User Manual (710-17074-00H)
Probable Cause
• The soft starter may be waiting for the restart delay to elapse. The length of
the restart delay is controlled by parameter 4M
The motor may be too hot to permit a start. If parameter 4N
•
Temperature Check
is set to Check, the soft starter will only permit a start
when it calculates that the motor has sufficient thermal capacity to complete
the start successfully. Wait for the motor to cool before attempting another
start.
• The starter may be disabled via a programmable input. If parameter 6A is set
to Starter Disable and there is an open circuit on C53, C54, the MVE will not
start. If there is no further need to disable the starter, close the circuit on the
input.
NOTE
Parameter 6Q
enabled.
• If the start current is too low, the motor will not produce enough torque to
accelerate to full speed. The soft starter may trip on excess start time.
NOTE
Make sure the motor starting parameters are appropriate for the
application and that you are using the intended motor starting profile.
If a programmable input is set to Motor Set Select, check that the
corresponding input is in the expected state.
• The load may be jammed. Check the load for severe overloading or a locked
rotor situation.
• The SCRs in the MVE require at least 5 A of current to latch. If you are testing
the soft starter on a motor with full load current less than 5 A, the SCRs may
not latch correctly.
The soft stop settings may not be appropriate for the motor and load. Review
•
the soft stop settings.
• If the motor is very lightly loaded, soft stop will have limited effect.
• Auto-Stop should only be used in remote mode with three-wire or four-wire
control.
Make sure you are saving the new value by pressing the STORE button after
•
adjusting a parameter setting. If you press EXIT, the change will not be saved.
Check that the adjustment lock (parameter 15B) is set to
•
adjustment lock is set to
You need to know the security access code to change the adjustment lock
setting.
• The EEPROM may be faulty on the controller. A faulty EEPROM will also trip
the soft starter, and the controller will display the message Parameter Out Of
Range. Contact your local supplier for advice.
The soft starter will not activate Run Simulation with three-phase power
connected. This prevents unintentional direct on-line (DOL) start.
Check that the setting of the CT ratio selector DIP switch on the power
•
interface board matches the ratio of the CT used.
Local/Remote
controls when the LCL/RMT button is
Read Only
, settings can be viewed but not changed.
Restart Delay
.
Motor
Read & Write
. If the