Section 10
Troubleshooting
20413005
8-2012/Rev 05
10-12
10.3 Softstarter
A flashing red LED indicates a fault, either internal to the softstarter, or with the incoming power
or motor. The number of flashes in sequence indicates the fault.
Table 10-2
Softstarter Troubleshooting Guide
1.
Pre-start
Motor fails to start
or
Motor attempts to start, but
aborts before up-to-speed
LED off Check control power
connections and the power
source to the softstarter.
LED on
Check isolation contactor for
proper closure.
Check presence of line power.
LED flashing one time;
overload
Reset overload.
LED flashing two times; over
temperature
Allow time for unit to cool.
LED flashing four times;
phase loss/open load
Check line and load connections
to the softstarter, contactors and
motor.
Confirm that 3-phase is present.
LED flashing five times;
phase imbalance
Check the line current present in
each phase.
The unit will trip if imbalance is
>50%.
LED flashing six times;
shorted SCR
Perform continuity check across
the power poles L1-T1, L2-T2,
L3-T3.
Remove line power and load
connections before taking
measurements. Measurements
should exceed 10k for good
power pole.
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