TROUBLESHOOTING
122
EMX4i User Manual 710-14888-00C
Symptom
Probable Cause
Erratic and noisy motor
operation.
•
If the soft starter is connected to the motor using
inside delta configuration, the soft starter may not be
correctly detecting the connection. Contact your local
supplier for advice.
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 EMX4i 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.
Soft stop ends too quickly.
•
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.
