ABB PST Installation And Maintenance Manual page 165

Status
Underload protection
Power on
Prot Underload
Reset
Locked rotor protection
Power on
Prot Locked Rot
Reset
High current protection
Power on
Prot High I
Reset
Phase imbalance protection
Power on
Prot Phase Imb.
Reset
Phase reversal protection
Power on
Prot Phase Rev
Reset
Low Voltage Products & Systems
ABB Inc. • 888-385-1221 • www.abb-control.com
Chapter 11 - Troubleshooting
Possible cause
The motor current is below set
level and time.
Fault Protection
Back
The motor is running stiff for some
reason.
A damaged bearing or a stuck
load could be possible causes.
Fault Protection
Back
A fault current, higher than 8 times
the softstarter rating has occurred.
Fault Protection
Back
Unbalance in the phase currents.
Fault Protection
Back
The phase sequence is not
correct.
Fault Protection
Back
Solution
• Check and correct the reason for
the underload.
• Check that the settings are
according to the operation
conditions.
• Check the bearings of the motor
and load.
• Check that the load is not running
stiff.
• Check the circuits including the
motor for any insulation fault, phase
to phase or ground fault.
• Check the main voltage and the
motor circuit.
• Restart the motor and check the
phase currents.
• Check the phase sequence on the
line side to (L1-L2-L3).
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AC 1006.9 - 5/03