Mounting Kit; Purge Air Switching (Not In The Explosion-Proof Version); Restrictors - Siemens PROFIBUS PA SIPART PS2 Manual

Design and Functional Principle

2.2.4 Mounting Kit

2.2.5 Purge air switching (not in the explosion-proof version)

Figure 2-6 Purge air switch on the valve block, view of the positioner onto pneumatic connection side
with cover open

2.2.6 Restrictors

Figure 2-7 Restrictors
28
The positioner can be mounted on almost all actuators with the ap-
propriate mounting kit.
The purge air switch is accessible above the pneumatic terminal strip
with the housing open (figure 2-6). In the IN position the inside of the
housing is purged with very small amounts of clean, dry instrument air.
In the OUT position the purge air is fed directly to the outside air (for
more information: see Chapter 3.3, page 41).
In order to achieve travel times of > 1.5 s in small actuators, the air rate
can be reduced with the restrictors Y1 and Y2 (figure 2-7, in
explosion-proof version, see figure 2-4, page 26). By turning to the right
the air rate is reduced up to shutting off. To set the restrictors it is
advisable to close them and then open them slowly (see initialization
RUN3).
Hexagon socket 2.5 mm
Y1 Y2
SIPART PS2 PA Manual
A5E00127926-03