17OPERATING AND TROUBLESHOOTING INSTRUCTIONS
1. Since actual inrush is dependent on the line
conditions, correct the line condition that
is causing excessive inrush.
2. Try another breaker rating. Perhaps the
tolerances on the one included with your
breaker are unfavorable.
3. Start the motor in soft starter mode.
4. For NEMA E motors (super premium efficiency),
the NEC 2023 version will allow a trip setting
of 1700% of motor FLA.
Motor overload trip level
Possible corrective actions are:
1. Allow the overload to cool sufficiently between
restarts. There is typically a 4 to 1 difference
between the operation time of the overloads
in their cold state versus their warm state.
2. Try another overload relay of the same rating.
Tolerances on the overloads are loose, and trip
times can vary significantly from unit to unit
of the same rating (range of 2 to 1 or more
is not uncommon).
3. Reduce the load on the motor during
acceleration. Total motor load during this period
is the sum of the accelerating torque plus load
torque. Once the motor is up to speed, the load
can be reapplied.
Soft starter fault codes
Refer to the 1SFC132082M9901 PSTX user manual
for troubleshooting assistance.
Refer to electric schematic and outline drawings,
which are included with the unit, for wiring and
mounting details. You can also download these
documents from the ABB website.
PSTX installation and commissioning manual,
1SFC132081M0201.
03
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