Samson 3730-4 - Page 39

EB 8384-4 EN 39
Attachment to the control valve – Mounting parts and accessories
The following applies to all reversing am-
pliers:
The signal pressure of the positioner is sup-
plied at the output 1 of the reversing ampli-
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.
How the outputs are marked depends on the
reversing amplier used:
− Type3710:Output 1/2 = Y
1
/Y
2
− 1079-1118and1079-1119:
Output 1/2 = A
1
/A
2
4.6.1 Reversing amplier
(1079-1118 or 1079-
1119)
Fig.14
1. Mount the connecting plate (6) from the
accessories in Table5 to the positioner.
Make sure that both O-rings (6.1) are
seated correctly.
Note
A
1
1.5 1.6
1.3
6.266.1
1.2 1.1 1 1.6
Z
A
2
1.4
A
1
A
2
Z
A
1
Output 38 Supply 9
Output 38 Supply 9
1.3 1.21.1
From the positioner
Control signals to the
actuator
1 Reversing amplier
1.1 Special screws
1.2 Gasket
1.3 Special nuts
1.4 Rubber seal
1.5 Sealing plug
1.6 Filter
6 Connecting plate
6.1 O-rings
6.2 Screws
Fig.14: Mounting a reversing amplier (1079-1118 or 1079-1119)