External Position Detection With Ncs Or External Position Detection System; Introduction To External Position Detection; Non-Contacting Sensor; Principle Of Operation Of Ncs - Siemens SIPART PS2 Operating Instructions Manual

External position detection with NCS or external
position detection system
B.1

Introduction to external position detection

External position detection system
Versions with flameproof enclosures may not be operated with an external position detection
system.
In some cases it makes sense to mount the position detection and the controller unit separately.
A separate mounting the case, for example, with continuous and strong vibrations, high or too
low ambient temperatures and nuclear radiation. A universal component is available for this
purpose. It is suitable for part-turn and linear actuators. You will require the following:
● An external position detection system with article number C73451-A430-D78 made of
polycarbonate or with article number 6DR4004-1ES made of aluminum consisting of:
– Positioner enclosure
– Integrated friction clutch
– Integrated potentiometer
– Various blanking plugs and seals.
● Or an NCS sensor for contact-free position detection 6DR4004-6N.../-8N...
● A positioner
● An EMC filter module with the article number C73451-A430–D23 is provided in a set along
with cable clamps and M20 cable glands.
The EMC filter module is used for the controller unit whenever an external position detection
system is used instead of the internal position sensor. An external position detection system
is, for example, a potentiometer with a 10 kΩ resistance or an NCS sensor.
B.2

Non-Contacting Sensor

B.2.1

Principle of operation of NCS

The NCS contains a magnetic field sensor. This sensor changes its electrical resistance in
response to the immediate presence of a permanent magnet. The sensor has a high signal-to-
noise ratio to external magnetic fields due to the measurement method used.
The following figure shows the mode of operation with a rotating magnet.
SIPART PS2 with and without HART
Operating Instructions, 05/2017, A5E00074631-AC
WARNING
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