Manual Operation Of Actuator; Version With Electric Override - Samson 3274 Mounting And Operating Instructions

Manual operation of actuator

6 Manual operation of actuator
6.1 Version with electric over-
ride
Types 3274-11 to -14 and -22, -23
The actuator stem can be retracted or ex-
tended by pressing one of the two pushbut-
tons located on the side housing cover. In
this way, the attached valve can be brought
into the required position.
After releasing the button, the actuator fol-
lows the control signal of the controller
again.
Î If the priority of the control signal (e.g.
upon start-up of the plant) is to be inter-
rupted and the control valve is to remain
in a certain position, disconnect the iso-
lating terminal 81 (Fig. 7).
To do this, proceed as follows:
1. Switch off the power supply.
2. Unscrew the two fastening screws and
remove the side housing cover.
3. Position a screwdriver at the isolating ter-
minal 81 underneath the release button
and lever up the button until it engages
(the red marking pin is hidden).
4. Mount cover again.
5. Reconnect the power supply.
The control signal is now interrupted and the
valve can be moved to the desired position
by using the two IN and OUT pushbuttons.
The valve will remains in the position the
valve is moved to.
18
If the controller signal is to have priority
again, proceed as follow:
1. Switch off the power supply and remove
the cover.
2. Firmly press down the release button un-
til it engages (the red marking pin reap-
pears).
3. Mount cover again and reconnect the
power supply.
EB 8340 EN