Samson 3725 - Zero calibration

EB 8394 EN 57
Operating the positioner
Initial state 1:
The positioner is not initialized.
The positioner goes to the fail-safe position after the initialization process has been canceled.
Initial state 2:
The positioner is initialized.
On canceling a new initialization process, the positioner returns to closed-loop operation.
The settings of the previous initialization are used.
A new initialization can be started directly afterwards.
7.9 Zero calibration
In case of inconsistencies in the closing position of the valve, e.g. with soft-seated plugs, it
might be necessary to recalibrate zero over Code P16 (enable conguration as described in
section7.2).
Start the zero calibration by activating Code P16 as follows:
1. Touch or until Code P16 appears.
2. Press
and hold for six seconds. 6...5...4...3...2...1 is counted
down on the display.
Zero calibration starts, ZERO blinks on the display.
The time required for the initialization procedure depends on the ac-
tuator transit time and can take a few minutes.
The positioner moves the control valve to the CLOSED position and recalibrates the internal
electric zero point.
When the zero calibration has been successfully completed, the positioner changes to closed-
loop operation.