General; General Problems And Faults - ABB PST Installation And Maintenance Manual

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.
Low Voltage Products & Systems
ABB Inc. • 888-385-1221 • www.abb-control.com
Chapter 11 - Troubleshooting
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

General problems and faults

Possible cause
Shorted SCR
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.
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.
159
AC 1006.9 - 5/03