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ABB PSTX720
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160 Troubleshooting | Installation and commissioning manual | 1SFC132081M0201
Status Possible cause Solution
Loading of parameters with Fieldbus
does not work correctly.
Fieldbus settings.
Make sure that parameters match between the PLC
and the Softstarter Fieldbus documentation for the
used Fieldbus protocol.
Make sure that the Auto mode bit of the binary output
telegram setting is 1.
Do a check if the HMI is set to remote control.
Make sure that the Local Mode digital input on the
ABB FieldBus Plug adapter is set to Remote.
Make sure that Fieldbus disable control in DI is not
connected.
Make sure that the Fieldbus control parameter is set
to On.
Shown phase currents in screen do not
agree with motor current.
Inside Delta connection.
If the Softstarter is connected Inside Delta, the phase
currents shown are = 58% ( 1 /(√3)) of the motor
current.
Shown current in screen is not stable. The motor is too small.
The load on the motor is too small.
(Current is out of measuring
range.)
Make sure that you have the correct Softstarter for
this motor size..
Dark screen and LED is active
Power save mode. Touch a key on the keypad.
Blank screen and no LED is active
Supply voltage is not connected.
Connect the Supply voltage. Refer to the circuit
diagram.
If problem stays, speak to your ABB Sales Office.
The RJ45 plug is missing
between the HMI and the
Softstarter.
RJ45 Network cable is
damaged.
Do a check of the RJ45 plug.
Do a check of the RJ45 Network cable
10

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