Connections; Pneumatic Connections; Signal Pressure Gauges; Supply Pressure - Samson 3730-2 Mounting And Operating Instructions

5 Connections

WARNING
!
Risk of injury due to the actuator stem ex-
tending or retracting.
Do not touch or block the actuator stem.
NOTICE
!
Risk of malfunction due to incorrect sequence
of mounting, installation, and start-up.
Keep the following sequence.
1. Remove the protective film from the pneu-
matic connections.
2. Mount the positioner on the control valve.
3. Connect the supply air.
4. Connect the electrical power.
5. Perform the start-up settings.

5.1 Pneumatic connections

NOTICE
!
Malfunction due to incorrect connection of the
supply air.
Do not connect the compressed air directly to
the threaded connections in the positioner
housing. Screw the screw fittings into the
connecting plate, pressure gauge mounting
block or connection block from the accesso-
ries.
The pneumatic connections in the connecting
plate, pressure gauge mounting block, and
connection block are optionally designed as
a bore with ¼ NPT or G ¼ thread. Custom-
ary cable glands for metal or copper tubing
or plastic hoses can be used.
EB 8384-2 EN
NOTICE
!
Risk of malfunction due to failure to comply
with required air quality.
Only use supply air that is dry and free of oil
and dust.
Read the maintenance instructions for up-
stream pressure reducing stations.
Blow through all air pipes and hoses thor-
oughly before connecting them.
If the positioner is attached directly to the
Type 3277 Actuator, the connection of the
positioner's output pressure to the actuator is
fixed. For attachment according to
IEC 60534-6 (NAMUR), the signal pressure
can be routed to either the top or bottom di-
aphragm chamber of the actuator, depend-
ing on the actuator's fail-safe action "actua-
tor stem extends" or "actuator stem retracts".
For rotary actuators, the manufacturer's
specifications for connection apply.
5.1.1

Signal pressure gauges

To monitor the supply air (supply) and signal
pressure (output), we recommend mounting
pressure gauges.
5.1.2

Supply pressure

The required supply air pressure depends on
the bench range and the actuator's direction
of action (fail-safe action).
The bench range is written on the nameplate
either as the spring range or signal pressure
range depending on the actuator. The direc-
tion of action is marked FA or FE, or by a
symbol.
Connections
55