Zero Calibration - Samson 3730-2 Mounting And Operating Instructions

Start-up and settings
Note
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 can-
celed and the positioner must be set to auto-
matic mode as follows:
Turn  Code 1
, Code 1 and
Press
Turn in order to move the valve slightly
past the blocking position.
Press to cancel mechanical blocking.
Turn  Code 0
Press , Code 0 blinks.
Turn  AUtO
Press .
The positioner switches to automatic mode.
The current valve position is indicated in %.
Note
If the positioner shows a tendency to oscillate
in automatic mode, the parameters K
T must be slightly corrected. Proceed as fol-
V
lows:
− Set TV (Code 18) to 4.
− If the positioner still oscillates, the gain K
(Code 17) must be decreased until the po-
sitioner shows a stable behavior.
74
icon blink.
and
P
P
Zero point calibration
Finally, if process operations allow it, the ze-
ro point must be calibrated according to sec-
tion 7.7.

7.7 Zero calibration

In case of inconsistencies in the closed posi-
tion of the valve, e.g. with soft-seated plugs,
it might be necessary to recalibrate zero.
WARNING
!
Risk of injury due to the actuator stem ex-
tending or retracting.
Do not touch or block the actuator stem.
NOTICE
!
The process is disturbed by the movement of
the actuator stem.
Do not perform zero calibration while the
process is running. First isolate the plant by
closing the shut-off valves.
Note
The positioner must be connected to the sup-
ply air to perform the zero calibration.
Enable configuration:
Turn
g Code 3, display: No
Press , Code 3 blinks.
Turn  YES
Press , display:
EB 8384-2 EN