ABB TZID-C Quick Start page 3
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Also See for TZID-C:
- Operating instructions manual (88 pages) ,
- Commissioning instructions (72 pages) ,
- Commissioning instruction (60 pages)
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Advantage of Adaptive Control Mode:
The positioner incorporates a unique "Adaptive Control" mode that will allow a "Selftune" function within the posi-
tioner to determine the best control parameters for the application (This process is independent of the PID control
settings needed in the DCS or controller to obtain loop control stability). The positioner will optimize the control per-
formance by adjusting the control parameters automatically as the dynamic conditions of the valve changes due to
process load demand changes.
In any application the process control performance is largely dependent on the control valve and the condition of
the valve. For this reason the valve needs to be in a "good" condition to ensure the optimum performance of the
Adaptive control mode.
Any deterioration of valve performance due to increased friction stick of the valve stem, cylinder shaft or stem/dia-
phragm leakage will cause the positioner to "adapt" to the changed valve condition in a attempt to optimize the per-
formance, however, this optimization does not represent dynamic process changes, in this case the positioner will
consistently optimise until the stem friction or deterioration has increased to an undesirable level. In this case the
positioner is unable to provide reliable control due to problems beyond its control. If the "TIME OUT" diagnostic
alarm of the positioner is active the positioner will provide a binary output as an alarm function when the set point is
not reached within the preset time. This "time-out" time can be adjusted. Refer to instruction manual "Alarm mes-
sages" for details.
In the case of the "Fixed Control" mode, the positioner will consistently position the valve with the control parame-
ters detected during the AUTOSTROKE process. It may become a consideration by the user to switch from the
"Adaptive Control" to the "Fixed Control" mode once the TZID-C was optimized as explained above.
The TZID-C also allows the user to access the control parameters manually via the front push buttons on the TZID-
C or via the ABB Smart Vision software tool to perform custom optimization that may be required in some extreme
cases when the standard AUTOSTROKE or Adaptive Control was not able to optimize the application.
The TZID-C Positioner is now ready for operation.
For more details contact:
Naas DeJager tel # 215 674 6944
Ken Frisbie tel # 215 674 6918
QUICK-START
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