Determining And Changing The Operating Direction - Samson 4765 Mounting And Operating Instructions

Operation
7.1.1 Determining and
changing the operating
direction
For an increasing input signal (reference
variable), the signal pressure p
be increasing (direct action <<) or decreas-
ing (reverse action <>).
Similarly, as the reference variable decreas-
es, the signal pressure can either decrease
(direct action <<) or increase (reverse action
<>).
On the flapper plate, the operating direction
is indicated by symbols (direct <<, reverse
<>). Depending on the position of the flap-
per plate, the adjusted operating direction
and the associated symbol become visible.
If the required operating direction does not
correspond to the visible symbol, or if the
operating direction is to be changed, pro-
ceed as follows:
1. Unscrew both screws on the cover plate,
and lift off the nozzle block along with
the cover plate.
2. Reinstall the nozzle block turned 180° to-
gether with the cover plate, and refasten.
Make sure that the nozzle block and flapper
plate are correctly located above or below
the feeler pin as shown in Fig. 9.
If the operating direction is to be changed
after the initially determined arrangement of
positioner and actuator, note that the posi-
tioner must be mounted in a different loca-
tion and the nozzle block must be turned.
Make sure the location of the lever (1) and
the plate (20), "lever on top of plate" or re-
14
versed "plate on top of lever" is correct
(Fig. 5 to Fig. 8).
can either
st
EB 8359-1 EN