Samson TROVIS 3730-3, Mounting And Operating Instructions

Page: 110 / 180

110 EB 8384-3 EN
Operating the positioner
Start initialization:
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Press INIT key.
The positioner switches to MAN mode.
The blocking position is indicated.
Since initialization has not been completed, the error code 76 (no emergency mode) and
possibly also error code 57 (control loop) may appear on the display. These alarms do not
influence the positioner’s readiness for operation.
Cancel the blocking position and change to automatic mode (AUTO):
For the positioner to follow its set point again, the blocking position must be canceled and
the positioner must be set to automatic mode as follows:
1. Turn until Code 1 appears.
2. Press , the code number 1 and icon blink.
3. Turn to build up pressure in the positioner to move the valve slightly past the block-
ing position.
4. Press to cancel the mechanical blocking.
5. Turn
until Code 0 appears.
6. Press , the code number 0 blinks.
7. Turn until
AUtO appears.
8. Press to confirm. The positioner switches to automatic mode. The current valve posi -
tion is indicated in %.
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If the positioner shows a tendency to oscillate in automatic mode, the parameters K
P
and
T
V
must be slightly corrected. Proceed as follows:
– Set T
V
(Code 18) to 4.
–
If the positioner still oscillates, the gain K
P
(Code 17) must be decreased until the posi -
tioner shows a stable behavior.
Zero point calibration
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Finally, if process operations allow it, the zero point must be calibrated according to sec-
tion 7.7.