Cashco Siemens PS2 I/P - Manual (Page 56)

Preparing for Operation
56
SIPART PS2 Manual
A5E00074631-01
3.5 Pneumatic Connection
!
WARNING
For reasons of safety, the pneumatic power may only be supplied after
assembly when the positioner is switched to operating level P manual
operation with electrical signal applied (as--delivered state, see figure
4-4, page 76).
.
NOTE
Note the air quality! Oil--free industrial air, solid content < 30 μm, pressure
dew point 20 K below the lowest ambient temperature.
-
Connect a manometer block for supply air and actuating pressure if
necessary.
-
Connection by female thread G 1/4 DIN 45141 or 1/4” NPT:
P
Z
Supply air 1.4 to 7 bar
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 18.
-
Safety position when the electric power supply fails:
single action:
Y1 deaerated
double action: Y1 Max. Actuating pressure
(supply air pressure)
Y2 deaerated
- Connect actuating pressure Y1 or Y2 (only in double--acting
actuators) according to the desired safety position.
- Connect supply air to P
Z
.
.
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.