Reaction To Failure Of Auxiliary Powers - Siemens SIPART PS2 Operating Instructions Manual

Connect
5.3 Pneumatic connection
5.3.4

Reaction to failure of auxiliary powers

Overview
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 PROFIBUS PA
Operating Instructions, 02/2016, A5E00127926-AB