B.2.2 Mounting the NCS
Function
The positioner facilitates the separate installation of the position detection system. The stroke
or rotary angle is measured directly at the actuator by means of a non-contacting sensor. It is
therefore possible to install the controller unit at some distance away, e.g. on a mounting pipe
or similar. The positioner is connected to the position detection system by means of an
electrical cable.
Such a separate installation is useful whenever the ambient conditions at the valve exceed the
specified positioner values.
The NCS consists of a molded sensor for fixed installation and a magnet. The magnet is
mounted to the spindle on linear actuators, or to the stub shaft on part-turn actuators. The
sensor housing is mounted onto the console on part-turn actuators and to the bracket on linear
actuators. The bracket can be a NAMUR type, or any other mounting bracket.
Auxiliary power is supplied to the NCS via the Analog Input Module (AIM) 6DR4004-6F and
EMC compatibility is ensured at the same time.
You have the following options:
● To order the Analog Input Module (AIM) already installed in the positioner, Catalog FI 01
● To retrofit the Analog Input Module (AIM) in the positioner; article number 6DR4004-6F. For
information on retrofitting the Analog Input Module (AIM), refer to the Installing/mounting
(Page 37) section of the positioner operating instructions.
① Pneumatic line
② Pneumatic line for double-action actuators
③ Position detection system (10 kΩ potentiometer or NCS)
④ Electrical cable
⑤ Retrofittable Analog Input Module (AIM) (in the positioner)
⑥ Positioner
Figure B-3 Separate installation of the NCS and positioner
External position detection
B.2 Non-Contacting Sensor
SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE 273
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