ABB PSTX Serie Mode D'emploi page 17

7 Troubleshooting
Depending on PSTX Softstarter configuration, different events may be signalled on the display. See Event list Table 7.1.
Table 7.1: Event list
Electronic overload
Locked rotor
Phase reversal
Current imbalance
Current underload
User defined protection
Earth fault
Over voltage
Under voltage
Voltage imbalance
PT100 protection
PTC protection
Power factor underload
Too long current limit
Bypass open fault
Fieldbus communication
failure
24V output
HMI failure
Extension IO failure
Max number of starts
Auto-restart time-out
Too long start time
Frequency range
The motor has been overloaded because of too high current over a
certain time. Check starting conditions and EOL settings.
The motor is running stiff. A damaged bearing or a stucked load
could be possible causes. Check the load and the motor.
The phase sequence is not correct. Change the phase sequence
on the line side to (L1→L2→L3).
Current imbalance between the phases. Restart the motor and
check the main currents and voltage.
The motor current has fallen below the settable value. Check that
the motor current parameter (Ie) is set correctly.
Check the external sensor.
Equipment protection. In a symmetrical three phase system, the
sum of the instantaneous line currents is equal to zero. Earth fault
indicates if the sum differs more than a settable value. This can
indicate a serious condition of the motor.
The mains voltage is too high. Check the mains voltage.
The mains voltage is too low. Check the mains voltage.
Voltage imbalance between the phases. Restart the motor and
check the mains voltage.
The external thermal sensor has detected a temperature higher
than the trip level. Check the root cause of theover heating.
The external thermal sensor has detected a temperature higher
than the trip level. Check the root cause of the over heating.
The power factor has fallen below the trip level.
The time at current limit has exceeded the set value. The starting
condition is too heavy for the set current limit. Check starting condi-
tions and parameters.
The bypass contactor or relay does not close when reached TOR.
Contact ABB sales office for service.
There is a communication disturbance between the softstarter and
PLC.
Check the hardwire inputs.
There is communication disturbance between the softstarter and
the HMI. Check the connection to the HMI.
There is communication disturbance between the softstarter and
the extension I/O module. Check the connection to the I/O module.
The settable maximum number of starts per hour has been
reached.
The time between trip and auto-restart attempt exceeds setting.
It takes too long time to soft start the motor. Check starting condi-
tions and current limit setting.
The frequency has been outside the allowed range longer than the
allowed time.
Softstarters Type PSTX30...PSTX1250 User Manual short form 1SFC132082M9901 17
Description