ABB TZIDC - Error Handling; Positioner Oscillates

44 TZIDC, TZIDC-200 DIGITAL POSITIONER | COI/TZIDC/TZIDC-200-EN REV. B
… 4 Diagnosis / error messages
Error handling
Positioner oscillates
The positioner oscillates in control
modes 1.0 and 1.1.

Press the  button. Is the current value
stable?

Check power source or PLS.
No

Yes
Switch the positioner to operating mode
1.2 (manually) and set to a position of
approx. 50 % using the local push
buttons. Is the position stable?

Check the piping and actuator for
leakage. If leakage is detected, send the
positioner for repair.
No

Yes
Start Autostroke and save the values.
Switch the positioner to the operating
mode 1.1.
Is the position stable?

Good job! The work activities are
completed.
Yes

No
Switch the positioner to operating mode
1.0 (adaptive) for 4 to 5 hours to
optimize control behavior. Several
changes to the setpoint signal are
required.
Is the positioner function stable?

Good job! The work activities are
completed.
Yes

No
Increase the deadband (DEADBAND).
Is the valve function stable?

Good job! The work activities are
completed.
Yes

No
The friction of the valve is too great or
Slipstic effect. Check the valve.