Zero Calibration - Samson 3730-5 Mounting And Operating Instructions

The positioner switches to MAN mode.
The blocking position is indicated.
Note:

Since initialization has not been com-
pleted, the error code 76 (no emer-
gency 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
Press , Code 1 and
Turn in order to move the valve slightly
past the blocking position.
Press to cancel mechanical blocking.
Turn  Code 0
, Code 0 blinks.
Press
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 pa-
rameters K
P
corrected. Proceed as follows:
(Code 18) to 4.
Set T
V
EB 8384-5 EN
blink.
and T must be slightly
V
If the positioner still oscillates, the
gain K (Code 17) must be decreased
P
until the positioner shows a stable
behavior.
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.
NOTICE
The process is disturbed by the move-
ment 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 supply air to perform the zero
calibration.
Enable configuration:
Turn g Code 3, display: No
Press , Code 3 blinks.
Turn  YES
Press , display:
Start-up and settings
73