Samson 3731-5, Mounting And Operating Instructions

Page: 67 / 112

EB 8387-5 EN 67
Operating the positioner
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 blocking 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 . The positioner switches to automatic mode. The current
valve position is indicated in %.
Î
If the positioner shows a tendency to oscillate in automatic mode, the parameters K
P
and
T
V
must be slightly corrected. To do this, 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
Finally, if process operations allow it, the zero point must be calibrated according to sec-
tion 7.6.