ABB PST Installation And Maintenance Manual page 166

Status
PTC protection
Power on
Prot PTC
Reset
SCR overload protection
Power on
Prot SCR OL
Reset
166
AC 1006.9 - 5/03
Chapter 11 - Troubleshooting
Possible cause
An over-temperature is detected
by the PTC thermistors in the
motor.
Fault Protection
Back
The softstarter is too small.
Too many starts / hour.
The ramp time for start is too long.
Fault Protection
Back
Solution
• Check that the PTC circuit is closed
and that the inputs are connected.
• Check and correct the reason for
the overheating
• Check and correct the reason for
the overheating
• Check and replace the softstarters
with one of a suitable size.
• Check and decrease number of
starts / hour.
• Check that current limit level is not
set too low.
• Check that the ramp time for start is
not too long.
Low Voltage Products & Systems
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