ABB PST30 Installation And Maintenance Manual page 89

11:6 Protection indication
Status
Motor overload protection
Power on Fault Protection
Prot Motor OL
Reset Back
Underload protection
Power on Fault Protection
Prot Underload
Reset Back
Locked rotor protection
Power on Fault Protection
Prot Locked Rot
Reset Back
High current protection
Power on Fault Protection
Prot High I
Reset Back
Phase imbalance protection
Power on Fault Protection
Prot Phase Imb.
Reset Back
Phase reversal protection
Power on Fault Protection
Prot Phase Rev
Reset Back
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Chapter 11
Troubleshooting
Possible cause
The motor has been exposed to an overload condition
because the current over a certain time is too high.
(The load on the motor shaft is too high).
The motor current is below set level and time
The motor is running stiff for some reason.
A damaged bearing or a stuck load could be possible
causes
A fault current, higher than 8 times the softstarter rat-
ing has occured
Unbalance in the phase currents
The phase sequence is not correct
Solution
In Line
At start
Check and correct the reason for the overload. Check
that current limit level is not set too low.
Check that the ramp time for start is not too long.
Check that correct overload class is used.
Check that parameter Setting Ie is correct.
Continuous run
Check and correct the reason for the overload.
Inside Delta
At start
Check and correct the reason for the overload.
Check that current limit level is not seet too low.
Check that the ramp time for start is not too long.
Check that correct overload class is used.
Check that parameter Setting Ie is set to 58% (1/ 3))
of the rated motor current.
Continuous run
Check and correct the reason for the overload.
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 insula-
tion fault, phas 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)
11
11.5
1SXU 132 021 M0201