TROUBLESHOOTING
12.3
General Faults
This table describes situations where the soft starter does not operate as expected but does not trip or give a warning.
Symptom
Probable Cause
Starter "Not Ready"
•
Check Input A (C53, C54). The starter may be disabled via a programmable input.
If parameter 6A or 6F is set to Starter Disable and there is an open circuit on the
corresponding input, the EMX3 will not start.
The soft starter does not respond to the
START or RESET button on the keypad.
•
The soft starter may be in Remote control mode. When the soft starter is in
Remote control mode, the Local LED on the starter is off. Press the LCL/RMT
button once to change to Local control.
The soft starter does not respond to
commands from the control inputs.
•
The soft starter may be in Local control mode. When the soft starter is in Local
control mode, the Local LED on the starter is on. Press the LCL/RMT button once
to change to Remote control.
•
The control wiring may be incorrect. Check that the remote start, stop and reset
inputs are configured correctly (refer to
Control Wiring
on page 10 for details).
•
The signals to the remote inputs may be incorrect. Test the signalling by
activating each input signal in turn. The appropriate remote control input LED
should activate on the starter.
The soft starter does not respond to a
start command from either the local or
remote controls.
•
The soft starter may be waiting for the restart delay to elapse. The length of the
restart delay is controlled by parameter 4M
Restart Delay
.
•
The motor may be too hot to permit a start. If parameter 4N
Motor 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 or 6F is
set to Starter Disable and there is an open circuit on the corresponding input, the
EMX3 will not start. If there is no further need to disable the starter, close the
circuit on the input.
NOTE
Parameter 6Q
Local/Remote
controls when the LCL/RMT button is
enabled.
A reset does not occur after an
Auto-Reset, when using a remote
two-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 two-wire control.
•
Auto Start/Stop should only be used in remote mode with three-wire or four-wire
control.
Non-resettable Thermistor Cct trip, when
there is a link between the thermistor
input B4, B5 or when the motor
thermistor connected between B4, B5 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' (parameter 16I).
Remote start/stop command is overriding
Auto Start/Stop settings when using
remote two-wire control.
•
Auto Start/Stop should only be used in remote mode with three-wire or four-wire
control.
The soft starter does not control the
motor correctly during starting.
•
Start performance may be unstable when using a low
Motor Full Load Current
setting (parameter 1A).
•
Power factor correction (PFC) capacitors must be installed on the supply side of the
soft starter and must be disconnected during starting and stopping. To control a
dedicated PFC capacitor contactor, connect the contactor to run relay terminals.
User Manual (710-04840-00M) |
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