Troubleshooting - ABB Contrac LME620-AI Operating Instruction

Trouble shooting
8 Trouble shooting
This chapter only covers hardware-related errors. For additional troubleshooting information,
refer to the online help for the operator interface.
Error
Valve cannot be moved by
actuator.
The actuator does not
respond.
Actuator does not run in AUT
mode, although "AUT" is
selected in the user interface.
LEDs in the commissioning
and service panel (CSP)
flash synchronously.
LEDs flash alternately.
Malfunction when
approaching the end position.
24
Possible cause
Failure either on the
actuator or the valve (e.g.,
stuffing box tightened too
much).
Incorrect electronic unit or
incorrect data record.
Incorrectly configured
electronic unit.
No communication with
the control system.
Incorrect wiring between
actuator and electronic
unit.
Defective motor/brake.
Binary inputs on the
electronic unit are not
wired.
Brake does not release
(no mechanical "click").
Digital input 1 (DI 1) not
wired.
Actuator is not adjusted
properly.
Electronic unit / drive
malfunction.
Actuator in limit range of
positioning sensor.
LME620-AI/-AN (Contrac)

Troubleshooting

Disconnect actuator from valve.
If the actuator moves, the valve is
the possible cause.
If the actuator does not move, the
actuator is the possible cause.
Compare information on name
plates for actuator and electronic
unit.
Check/update the settings for the
parametrization software.
Check wiring.
Check wiring.
Check the winding resistance of
the motor and brake.
Check the brake lock.
Make connection.
Check the brake air gap (approx.
0.25 mm (0.010 inch)) and
electrical connection to the brake.
Check winding resistance of the
brake coil.
Make connection.
Check the software settings for
the digital inputs.
Adjust actuator.
Drive the actuator beyond the
adjusted end position (either
manually or using the pushbuttons
on the CSP). Disconnect from
valve, if necessary.
Drive the actuator back into the
operating range and connect it to
the valve.
Readjust the actuator for the
operating range.
42/68-273-EN