ABB PST Series - Page 165

165
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8QGHUORDGSURWHFWLRQ 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.
/RFNHGURWRUSURWHFWLRQ 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.
+LJKFXUUHQWSURWHFWLRQ 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.
3KDVHLPEDODQFHSURWHFWLRQ Unbalance in the phase currents. • Check the main voltage and the motor
circuit.
• Restart the motor and check the phase
currents
3KDVHUHYHUVDOSURWHFWLRQ The phase sequence is not
correct.
• Change the phase sequence on the line
side to (L1-L2-L3).
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