Samson 3730-0 - Setting Start-up Parameters

EB 8384-0 EN 45
Mounting and start-up
FE: The air purging function is automatically
provided.
Attachment according to IEC60534-6
(NAMUR rib or attachment to rod-type
yokes)
The positioner requires an additional port for
the exhaust air that can be connected over
piping. An adapter available as an accesso-
ry is used for this purpose:
Threaded bushing
(M20x1.5)
G¼
¼NPT
0310-2619
0310-2550
The adapter uses one of the M20x1.5 con-
nections in the housing which means only
one cable gland can be installed.
Should other valve accessories be used
which vent the actuator (e.g. solenoid valve,
volume booster, quick exhaust valve), this ex-
haust air must also be included in the purg-
ing function. The connection over the adapt-
er at the positioner must be protected with a
check valve (e.g. check valve G ¼, order no.
8502-0597)mountedinthepiping.Other-
wise the pressure in the positioner housing
would rise above the ambient pressure and
damage the positioner when the exhausting
components respond suddenly.
5.10 Setting start-up parameters
After the positioner has been mounted on
the valve, all switches S1 to S10 must be set
to OFF (see Operating controls of
Type3730-0Positioneronpage53).
5.10.1 Fail-safe position
The switch position of switch S1 depends on
the fail-safe position of the valve:
− AIR TO OPEN · Upon air supply failure,
the valve is completely closed by the actu
-
ator. As the signal pressure increases at
the positioner output (38), the valve
opens.
− AIR TO CLOSE · Upon air supply failure,
the valve is completely opened by the ac-
tuator. As the signal pressure increases at
the positioner output, the valve closes.
To determine the switch position, read the
associated switch position S1 = ON or OFF
from the cover plate at the actuator symbols.
The symbols are read properly when the
symbol shows the actuator on top of the
valve; symbols upside down do not apply.
AIR TO OPEN: Pneumatic connections point
to the right S1 = ON. Pneumatic connections
point to the left S1 = OFF.
AIR TO CLOSE: Pneumatic connections point
to the right S1 = OFF. Pneumatic connections
point to the left S1 = ON.
AIR TO OPEN always applies for double-act-
ing actuators. Proceed as described in sec-
tion5.11toconnectthereversingamplier.
Note