Pneumatic Connection - Siemens PROFIBUS PA SIPART PS2 Manual

3.5

Pneumatic Connection

!
.
.
SIPART PS2 PA Manual
A5E00127926-03
WARNING
For reasons of safety, the pneumatic power may only be supplied after
assembly when the positioner is switched to operating mode P manual
operation with electrical signal applied (as-delivered state, see figure
4-4, page 86).
NOTE
Note the air quality! Oil-free industrial air, solid content < 30 μm, pressure
dew point 20 K below the lowest ambient temperature (chapter 7 "Techni-
cal Data", page 141).
Connect a manometer block for supply air and actuating pressure if
S
necessary.
Connection by female thread G 1/4 DIN 45141 or 1/4" NPT:
S
P Supply air 1.4 to 7 bar
Z
Y1 actuating pressure 1 for single- and double-acting
actuators
Y2 actuating pressure 2 for double-acting actuators
E exhaust air outlet (remove silencer if necessary)
see figure 2-3 and 2-4, page 26.
Safety position when the electric power supply fails:
S
single-acting: Y1
double-acting: Y1
Y2
Connect actuating pressure Y1 or Y2 (only in double-acting actua-
S
tors) according to the desired safety position.
Connect supply air to P
S
NOTE
In order for spring-loaded pneumatic actuators to be able to reliably
exploit the maximum possible actuating path, the supply pressure must
be sufficiently greater than the maximum required final pressure of the
actuator.
After installing the device, check the pneumatic connections of the entire
assembly for leakage. Any leakage would cause not only continuous
consumption of compressed air but also would cause the positioner to
continually endeavor to compensate for the variance in position, leading
in time to premature wear of the whole control mechanism.
Preparing for Operation
deaerated
Max. actuating pressure
(supply air pressure)
deaerated
.
Z
65