ABB PST210 - Page 186

Trouble shooting
Chapter 11
186
1SFC132003M0201
Underload protection
The motor current is below set
level and time.
• Check and correct the reason for the
underload.
• Check that the settings are according to
the operation conditions.
Locked rotor protection
The motor is running stiff by
some reason.
A damaged bearing or a stucked
load could be possible causes.
• Check the bearings of the motor and
load.
• Check that the load is not running stiff.
High current protection
A fault current, higher than 8
times the softstarter ratings, has
occurred.
• Check the circuits including the motor for
any insulation fault phase to phase or
earth fault.
Phase imbalance protection
Unbalance in the phase currents. • Check the main voltage and the motor
circuit.
• Restart the motor and check the phase
currents
Phase reversal protection
The phase sequence is not
correct.
• Change the phase sequence on the line
side to (L1-L2-L3).
Status Possible cause Solution
Power on ProtectionFault
Prot Underload
Reset Back
Power on ProtectionFault
Prot Locked Rot
Reset Back
Power on ProtectionFault
Prot High I
Reset Back
Power on ProtectionFault
Prot Phase Imb.
Reset Back
Power on ProtectionFault
Prot Phase Rev
Reset Back