Troubleshooting
Symptom
Probable Cause
The soft starter does not
respond to commands from
the control inputs.
•
The soft starter will only accept commands from the inputs
if parameter 1A
Command Source
is set to Digital Input.
Check the setting of 1A.
•
The control wiring may be incorrect. Check that the
remote start, stop and reset inputs are configured correctly
(see
Start/Stop
on page 20 for details).
•
The signals to the remote inputs may be incorrect. Test
the signalling by activating each input signal in turn.
The soft starter does not
respond to a start
command from either the
keypad or the digital inputs.
•
The soft starter may be waiting for the restart delay to
elapse. The length of the restart delay is controlled by
parameter 5H
Restart Delay
.
•
The motor may be too hot to permit a start. 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 reset input may be active. If the reset input is active,
the starter will not operate.
•
The soft starter may be waiting for control signals via the
communications network (parameter 1A
Command
Source
= Network).
Remote keypad shows
message "awaiting data"
The keypad is not receiving data from the control PCB. Check
the cable connection.
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 1B).
•
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 use the soft
starter to control power factor correction, connect the PFC
contactor to a programmable relay set to Run.
•
High levels of harmonics on the mains supply can affect
soft starter performance. If variable speed drives are
installed nearby, check they are properly grounded and
filtered.
Motor does not reach full
speed.
•
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.
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