Zero Calibration - Samson 3725 Mounting And Operating Instructions

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 configuration as described in
section 7.2).
Start the zero calibration by activating Code P16 as follows:
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.
EB 8394 EN
1. Touch or
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.
until Code P16 appears.
Operating the positioner
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