ABB PST Series - Chapter 11 Trouble shooting; 11:1 General; 11:2 General problems and faults

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This chapter is a guide that can be used in case problems
should arise with the softstarter or the application.
The softstarter normally indicates a fault with LED Fault,
and the LCD displays what type of fault it is. When a
protection is activated it will be indicated with LED
Protection and the LCD displays what type of protection is
active.
Faults not displayed in the softstarter can also be found in
this chapter.
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Motor humming / starts without
given start signal.
Shorted thyristor.
By-pass contactor stuck in
closed position.
• Check and replace.
• Check and correct the reason.
Bad motor sound during start
and operation.
Inside Delta connection wrong. • Check and correct the wiring.
Bad motor sound during stop. Wrong ramp time for stop. • Try different ramp times (some adjust-
ments can be necessary for best
result).
Motor does not start when giving
start command using the hard-
ware inputs.
Control wiring not correct.
Start and stop command given at
the same time.
Keypad is in Local Control menu.
• Check connections for start and stop.
• Check that start and stop command is
not given at the same time.
• Check that the keypad is not in Local
Control menu.
• Check that parameter Fieldbus Ctrl is
set to No.
Motor does not start when giving
start command using the fieldbus
communication.
Setting of fieldbus parameter
wrong.
• Check that parameter Fieldbus Ctrl is
set to Yes.
• Check that bit "Enable" is used.
• Check that programmable inputs have
correct settings.