Samson TROVIS 3730-1, Translation Of Original Instructions

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5-30 EB 8484-1 EN
Installation
6. Unscrew the standard follower pin (2)
from the positioner's M lever (1). Attach
the follower pin (Ø5 mm) included in the
mounting kit to pin position 90°.
7. Mount connecting plate (6) for required
G ¼ connecting thread or pressure
gauge bracket (7) with pressure gauges
on the positioner. Make sure that the two
seals (6.1) are seated properly. Dou-
ble-acting springless rotary actuators re-
quire the use of a reversing amplifier on
the connection side of the positioner
housing (see section 5.6.7).
8. Place positioner on housing (10) and
screw it tight. Taking the actuator's direc-
tion of rotation into account, adjust lever
(1) so that it engages in the correct slot
with its follower pin (Fig. 5-24).
5.6.7 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,
u
EB 8392
The following applies to all reversing
amplifiers:
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.
5.6.8 Attaching positioners
with stainless steel
housings
Positioners with stainless steel housings re-
quire mounting parts that are completely
made of stainless steel or free of aluminum.