Reversing Amplifier For Double-Acting Actuators; Reversing Amplifier (1079-1118 Or 1079-1119) - Samson 3730-3 Mounting And Operating Instructions

Mounting and start-up
5.9 Reversing amplifier for
double-acting actuators
For the use with double-acting actuators, the
positioner must be fitted with a reversing am-
plifier:
Î SAMSON Type 3710 Reversing Amplifier,
EB 8392
u
Î If a different reversing amplifier (item no.
1079-1118 or 1079-1119) is used,
mount it as described in section 5.9.1.
The following applies to all reversing am-
plifiers:
The signal pressure of the positioner is sup-
plied at the output 1 of the reversing amplifi-
er. An opposing pressure, which equals the
required supply pressure (Z) when added to
the pressure at output 1, is applied at output
2.
The following relationship applies:
output 1 + output 2 = Supply pressure (Z).
Connect output 1 to the signal pressure con-
nection on the actuator that causes the valve
to open when the pressure rises.
Connect output 2 to the signal pressure con-
nection on the actuator that causes the valve
to close when the pressure rises.
Î Set slide switch on positioner to AIR TO
OPEN.
Note
How the outputs are marked depends on the
reversing amplifier used:
− Type 3710: Output 1/2 = Y
− 1079-1118 and 1079-1119:
Output 1/2 = A /A
1
68
/Y
1 2
2
5.9.1 Reversing amplifier
(1079-1118 or 1079-
1119)
Î Refer to Fig. 24
1. Mount the connecting plate (6) from the
accessories in Table 6 to the positioner.
Make sure that both O-rings (6.1) are
seated correctly.
2. Thread the special nuts (1.3) from the ac-
cessories of the reversing amplifier into
the boreholes of the connecting plate.
3. Insert the gasket (1.2) into the recess of
the reversing amplifier and slide both the
hollowed special screws (1.1) into the
connecting boreholes A
4. Place the reversing amplifier onto the
connecting plate (6) and screw tight us-
ing both the special screws (1.1).
5. Use a screwdriver (8 mm wide) to screw
the enclosed filters (1.6) into the connec-
tion boreholes A
NOTICE
!
Air can escape uncontrolled from the signal
pressure connection.
Do not unscrew the sealing plug (1.5) out of
the reversing amplifier.
Note
The rubber seal (1.4) is not required and can
be removed when the sealing plug is used.
6. After initialization, set Code 16 (Pressure
limit) to No.
and Z.
1
and Z.
1
EB 8384-3 EN