B.3 External position detection system
B.3.1 Principle of operation of external position detection system
The external position detection systems essentially consist of an enclosure and an internal
position detection system. The position is recorded by a potentiometer or an internal NCS
module, section "Principle of operation of NCS (Page 310)". The controller unit is separated
from the positioner.
Such a separate installation is useful whenever the ambient conditions at the valve exceed the
specified positioner values.
The external position detection system is secured to a console on rotary actuators and to a
mounting bracket on linear actuators, section "Mounting to linear actuator (Page 42)".
Auxiliary power is supplied to the external position detection system via the EMC filter module,
and EMC is ensured at the same time.
① Pneumatic line
② Pneumatic line for double-action actuators
③ External position detection system
④ Electrical cable
⑤ EMC filter module (fitted in the positioner or retrofittable)
⑥ Positioner
Figure B-9 External position detection system and positioner
Mounting of an external position detection system corresponds to the mounting of the
positioner in a non-flameproof enclosure. Proceed as described in Section "Installing and
mounting (Page 39)". The connection of the module is described in section "EMC filter modules
6DR4004-6F and -8F (Page 89)".
B.3.2 Connecting the external position detection system to the EMC filter module
Requirement
You have an external position detection system.
External position detection
B.3 External position detection system
SIPART PS2 with PROFIBUS PA
Operating Instructions, 05/2019, A5E00127926-AC 325
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