Reversing Amplifier For Double-Acting Actuators - Samson 3730-3 Mounting And Operating Instructions

Attachment to the control valve – mounting parts and accessories
2.5 Reversing amplifier for
double-acting actuators
For the use with double-acting actuators, the
positioner must be fitted with a reversing
amplifier. The reversing amplifier is listed as
an accessory in the Table 5 on page 15.
The output signal pressure of the positioner
is supplied at the output A
amplifier. An opposing pressure, which
equals the required supply pressure when
added to the pressure at A
output A .
2
The rule A + A = Z applies.
1 2
Mounting
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.
2. Thread the special nuts (1.3) from the
accessories 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 push 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 con-
necting boreholes A
26
EB 8384-3 EN
of the reversing
1
, is applied at
1
and Z.
1
and Z.
1
Note!
The sealing plug (1.5) in the Type 3730
Positioner should not be unscrewed out of
the reversing amplifier.
The rubber seal (1.4) is not required and
can be removed when the sealing plug is
used.
Signal pressure connections
: Output A leading to the signal pressure
A
1 1
connection at the actuator which opens the
valve when the pressure increases
A : Output A leading to the signal pressure
2 2
connection at the actuator which closes the
valve when the pressure increases
4
Set slide switch on positioner to
AIR TO OPEN.