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Reversing amplifier for double-acting actuators
2.3.4 Reversing amplifier for
double-acting actuators
For the use with double-acting actuators,
the positioner must be fitted with a revers-
ing amplifier.
The reversing amplifier is listed as an acces-
sory in the Table 6 on page 17.
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
. The rule A
2
Mounting
Note!
Prior to mounting the reversing amplifier,
remove the sealing plug (1.5). The rubber
seal (1.4) must be remain attached.
1. Thread the special nuts (1.3) from the
accessories of the reversing amplifier
into the threaded ports of the positioner.
2. Insert the gasket (1.2) into the recess of
the reversing amplifier and push both
the hollowed special screws (1.1) into
the connecting ports A1 and Z.
3. Place the reversing amplifier onto the
positioner and screw tight using both
the special screws (1.1).
4. Screw the supplied filter (1.6) using a
screwdriver (8 mm wide) into the con-
necting bore holes A1 and Z.
22
EB 8383-1 EN
of the reversing
1
is applied at
1,
+ A
= Z applies.
1
2
Signal pressure connections
: Output A
leading to the signal press-
A
1
1
ure connection at the actuator which opens
the valve when the pressure increases
A
: Output A
leading to the signal press-
2
2
ure connection at the actuator which closes
the valve when the pressure increases
Enter the actuator as "Double-acting
without spring-return mechanism" in the
user interface software under Start-up →
Type of actuator.
2.4 Fail-safe action of the actuator
Note!
If the fail-safe action of the actuator is
changed subsequently by converting the ac-
tuator springs from "actuator stem extends"
to "actuator stem retracts", the mechanical
zero must be recalibrated and the posi-
tioner reinitialized.
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