General Problems And Faults - ABB PST30 Installation And Commissioning Manual

Chapter 11
Trouble shooting
Status
Motor humming / starts without
given start signal.
Bad motor sound during start
and operation.
Bad motor sound during stop.
Motor does not start when giving
start command using the hard-
ware inputs.
Motor does not start when giving
start command using the fieldbus
communication.
Displayed current in LCD does
not correspond to motor current.
Displayed current in LCD is not
stable.
Loading of parameters does
not work properly.
180

11:3 General problems and faults

Possible cause
Shorted thyristor.
By-pass contactor stuck in
closed position.
Inside Delta connection wrong.
Wrong ramp time for stop.
Control wiring not correct
Start and stop command given
at the same time.
Keypad is in Local Control menu.
Setting of fieldbus parameter
wrong.
Inside Delta connection.
The motor is too small.
The load on the motor is too
small.
(current is out of measuring
range).
Fieldbus settings.
Solution
• Check and replace.
• Check and correct the reason.
• Check and correct the wiring.
• Try different ramp times (some adjust-
ments can be necessary for best
result).
• 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.
• Check that parameter Fieldbus Ctrl is
set to Yes.
• Check that bit "Enable" is used.
• Check that programmable inputs have
correct settings.
• If the softstarter is connected Inside
Delta, the current displayed is 58%
⁄ ( )
( ) of the motor current.
1 3
• Check that the softstarter corresponds
to the motor size.
• Increase the load if possible.
• Check that softstarter and motor sizes
correspond.
• See chapter Fieldbus for actual field-
bus type.
1SFC132003M0201