42/18-54 EN Electro-pneumatic positioner TZID 29
3.4.7 Restoring the factory setting
Positioners adapted to special operating data can be reset to the factory setting. This
may become necessary if, for example, an already configured positioner is mounted to
another actuator.
Proceed as described below to restore the factory setting (requires Software Revision
4.5 or higher):
• Select operating level 1, “Manual control”
• Press and hold the “Reset” push button. Wait until the displayed countdown from 10
to 0 is terminated.
• Release the “Reset“ button. A flashing colon appears in the display.
• Press and hold “Reset“ again. Wait until the displayed countdown from 10 to 0 is
terminated (factory setting will be saved in the non-volatile memory).
• Release the “Reset” button.
3.4.8 Performing the Autostroke
The Autostroke function is started via the operator panel (see section"Display and opera-
tor panel"). The individual steps and, thus, the progress is indicated on the display. The
following is a reference list.
Display Autostroking function
10 Fully depressurize the actuator.
11 Save position of fully depressurized actuator.
12 Determine and save resolution (A/D
conversion).
20 Fully pressurize actuator.
21 Save position of fully pressurized actuator.
30 Prepare determination of positioning time
31 Set valve from 100 % to 0 % position. Measure
and save the positioning time.
32 Set valve from 0 % to 100 % position. Measure
and save the positioning time.
40 Determine and save the deadband (smallest
possible value). Determine and save PD
control parameters for rapid control of
deviations > deadband.
50 -120 Determine and save PID control parameters
for fine adjustment of control deviations <
deadband.
200 Autostroke completed.
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