ABB PST30 Installation And Commissioning Manual page 186

Chapter 11
Trouble shooting
Status
Underload protection
Power on Fault Protection
Prot Underload
Reset
Locked rotor protection
Power on Fault Protection
Prot Locked Rot
Reset
High current protection
Power on Fault Protection
Prot High I
Reset
Phase imbalance protection
Power on Fault Protection
Prot Phase Imb.
Reset
Phase reversal protection
Power on Fault Protection
Prot Phase Rev
Reset
186
Possible cause
The motor current is below set
level and time.
Back
The motor is running stiff by
some reason.
A damaged bearing or a stucked
load could be possible causes.
Back
A fault current, higher than 8
times the softstarter ratings, has
occurred.
Back
Unbalance in the phase currents. • Check the main voltage and the motor
Back
The phase sequence is not
correct.
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
earth fault.
circuit.
• Restart the motor and check the phase
currents
• Change the phase sequence on the line
side to (L1-L2-L3).
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