Reaction To Failure Of Auxiliary Powers - Siemens 6DR50 Series Operating Instructions Manual

5.3.1.4

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.
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12
CAUTION
Connection
5.3 Pneumatic
97