PTC protection
Power on ProtectionFault
Prot PTC
Reset Back
An over-temperature is detected by the PTC thermis-
tors in the motor
Check that the PTC circuit is closed and that the inputs
are connected
Check and correct the reason for the overheating
SCR overload protection
Power on ProtectionFault
Prot SCR OL
Reset Back
The softstarter is too small
Too many starts/hour
The ramp time for start is too long
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
11:6 Protection indication (cont.)
Chapter 11
Troubleshooting
11.6 Low Voltage Products & Systems
1SXU 132 021 M0201 ABB Inc. • 888-385-1221 • www.abb-control.com
11
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