ABB PST30 Installation And Maintenance Manual page 86

11:1 General
This chapter is a guide that can be used in case problems 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.
11:2 Overview of indications
This table shows in which state the different indications for protections, faults and warning may show up.
X –
Stand by
X –
At start signal
X –
Ramp up
X X
TOR
X –
At stop signal
X –
Ramp down
1) Only if Fieldbus control is selected
2) Only if Kick-start is selected.
3) Only if by-pass is used.
4) Only if by-pass is not used.
11:3 General problems and faults
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 hardware inputs
Motor does not start when giving start command using
the fieldbus communication
Displayed current in LCD does not correspond to mo-
tor current
Displayed current in LCD is not stable
Loading of parameters does not work properly
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11.2
1SXU 132 021 M0201
Chapter 11
Troubleshooting
Active when selected
– X – – X X
– X – X X X
– X – – X X
X X X – X X
– X – – X X
– X – – X X
Possible cause
Shorted SCR
By-pass contactor stuck in the 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
Always active
– – – – X
X X X X X X
2
X – – – X
X – – – X
X – – – X
X – – – X
Active when selected
– – X – – X
1
X – X – – X
1
– X X – – X
1
– X X – X X
1 3
X X X X – X
4 1 3
X X X – – X
1
Solution
Check and replace
Check and correct the reason
Check and correct the wiring
Try different ramp times (some adjustments may 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% (1/( 3)) of the motor current.
Check that the softstarter corresponds to the m
See Chapter 8 Fieldbus for actual fieldbus type
Low Voltage Products & Systems
ABB Inc. • 888-385-1221 • www.abb-control.com
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X X X
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