Manual/Automatic Switchover; Mounting On Positioners - Samson 4708 Mounting And Operating Instructions

4.3 Manual/automatic
switchover
The positioner output is routed to the actua-
tor over the manual/automatic switchover. In
automatic mode, the positioner is in closed-
loop operation. In manual mode, the output
pressure of any supply pressure regulator is
directly applied to the actuator. This creates
a manual bypass of the positioner.
The manual/automatic switchover unit is
mounted directly onto Types 376x and 373x
(see Fig. 12) or on an adapter plate with
hook-up to the actuator (Fig. 15).
The Type 4708-53 or Type 4708-54 Supply
Pressure Regulator can be directly mounted.
All other supply pressure regulators can be
connected to the manual/automatic switcho-
ver unit using piping (hook-up).
Output (38)
Supply (9)
Fig. 13: Mounting the manual/automatic switchover using an adapter plate
EB 8546 EN
Output
Supply
2
1
4.3.1

Mounting on positioners

Fig. 12: Mounting on positioners
− Insert gasket into recess of the manual/
automatic switchover unit.
− Fasten the manual/automatic switchover
unit to the positioner using the two hex-
agonal socket screws.
− Connect hook-up to the SUPPLY and
OUTPUT connections of the manual/au-
tomatic switchover unit.
4
3
Pneumatic connections
1 Pneumatic control valve with
positioner
2 Adapter plate:
1400-9605 (G),
1400-9606 (NPT)
3 Type 4708-82 Manual/
automatic Switchover in AUTO
mode
4 Supply pressure regulator with
filter (e.g. Type 4708-10)
19