Siemens SIPART Series Operating Instructions Manual page 98

Connection
5.2 Pneumatic
5.2.1.4 Pneumatic connection versions
Overview
For the integrated attachment for single-acting linear actuators, the following pneumatic
connections are provided at the rear side of the standard controller:
● Actuating pressure Y1
● Exhaust air outlet
These connections are sealed with screws when the device is delivered.
The exhaust air outlet is corrosion-resistant for the blanketing of the pick-up room and the
spring chamber with dry instrument air.
The following overview diagram shows the pneumatic connection versions for different
actuator types, regulating action and safety position after an auxiliary power supply failure.
Before working on the control valve
Note that before working on the control valve, you must first move it to the safety position.
Make sure that the control valve has reached the safety position. If you only interrupt the
pneumatic auxiliary power supply to the positioner, the safety position may in some cases
only be attained after a certain delay period.
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CAUTION
SIPART PS2 with and without HART
Operating Instructions, 10/2013, A5E00074631-11