166 Low Voltage Products & Systems
AC 1006.9 - 5/03 ABB Inc. • 888-385-1221 • www.abb-control.com
Status Possible cause
PTC protection • 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
SCR overload protection • 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.
Solution
An over-temperature is detected
by the PTC thermistors in the
motor.
The softstarter is too small.
Too many starts / hour.
The ramp time for start is too long.
Chapter 11 - Troubleshooting
Power on ProtectionFault
Prot PTC
Reset Back
Power on ProtectionFault
Prot SCR OL
Reset Back
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