Samson 3730-2 - Sub - Substitute Calibration

106 EB 8384-2 EN
Operating the positioner
Select the initialization mode:
1. Turn untilCode6appears.
2. Press
, the code number 6 blinks.
3. Turn
until MAN appears.
4. Press
toconrmtheMANinitialization
mode.
Init mode
Default: MAX
Enter OPEN position:
1. Turn untilCode0appears.
2. Press
, the code number 0 blinks.
3. Turn
until MAN appears.
4. Press
toconrm.
5. Turn
untilCode1appears.
6. Press
, the code number 1 blinks.
7. Turn
until the valve reaches its OPEN
position.
8. Press toconrmtheOPENposition.
Manual set point
(current angle of rota-
tion is indicated)
Start initialization:
Î Press INIT key.
7.6.4 SUb – Substitute calibration
A complete initialization procedure takes several minutes and requires the valve to move
through its entire travel range several times. In the SUb initialization mode, the control pa-
rameters are estimated and not determined by an initialization procedure. As a result, a high
level of accuracy cannot be expected. A different initialization mode should be selected if the
plant allows it.
The substitute calibration is used to replace a positioner while the process is running. For this
purpose,thecontrolvalveisusuallyxedmechanicallyinacertainpositionorpneumatically
by means of a pressure signal which is routed to the actuator externally. The blocking posi-
tion ensures that the plant continues to operate with this valve position.