Samson 3767, Translation Of Original Instructions

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5-16 EB 8355-2 EN
Installation
5.3.4 Reversing amplifier for
double-acting actuators
For the use with double-acting actuators, the
positioner must be fitted with a reversing am -
plifier, e.g. the SAMSON Type 3710 Revers -
ing Amplifier (see Mounting and Operating
Instructions
u
EB 8392 ).
The signal pressure of the positioner is sup-
plied at the output A1 of the reversing ampli-
fier. An opposing pressure, which equals the
required supply pressure Z when added to
the pressure at A1, is applied at output A2.
The rule A1 + A2 = Z applies.
If a different reversing amplifier (item no.
1079-1118 or 1079-1119) is used, follow
the mounting instructions described below:
Signal pressure connections
A1 : Connect output A1 to the signal pressure
connection on the actuator that causes the
valve to open when the pressure rises.
A2 : Connect output A2 to the signal pressure
connection on the actuator that causes the
valve to close when the pressure rises.
Pressure gauge attachment
The mounting sequence shown in Fig. 5-10
remains unchanged. Screw a pressure
gauge bracket onto the connections A1 and
Z.
Pressure gauge bracket:
− G ¼: 1400-7106
− ¼ NPT: 1400-7107
Pressure gauges for supply air Z and output
A1 according to section 5.8.
Mounting
When using a reversing amplifier, the pres -
sure regulator (9) must be turned as far as it
will go in the clockwise direction.
Remove the sealing plug (1.5) before mount -
ing the reversing amplifier. The rubber seal
(1.4) must remain installed.
1. Screw the special nuts (1.3) from the ac-
cessories of the reversing amplifier into
the threaded connections of the position-
er.
2. 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 A1 and Z.
3. Place the reversing amplifier onto the po -
sitioner and screw tight using the two
special screws (1.1).
4. Use a screwdriver (8 mm wide) to screw
the enclosed filters (1.6) into the connec -
tion boreholes A1 and Z.
1.3 1.2 1.1 1
Output 38
Supply
9
A1
1.5 1.6
Z
A2
1.4
A1 A2
Output 38 Supply 9
1.3 1.2 1.1
1.6
Z
A1
From the positioner
Control signals to the actuator
1 Reversing amplifier
1.1 Special screws
1.2 Gasket
1.3 Special nuts
1.4 Rubber seal
1.5 Stopper
1.6 Filter
Fig. 5-10: Mounting a reversing amplifier
Note