Samson 4708 Series - 7 Manual;Automatic Switchover; Mounting on Positioners

EB 8546 EN 37
Manual/automaticswitchover
7 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).
7.1 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
hexagonal socket screws.
− Connect hook-up to the SUPPLY and
OUTPUT connections of the manual/
automatic switchover unit.
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 lter (e.g.
Type4708-10)
Output (38)
Supply (9)
Supply
Output
1
2
3
4
Fig.13:Mounting the manual/automatic switchover using an adapter plate