Relay AnDi1 User Manual page 5

2.2.3 Sensors
The sensor inputs of the AnDi4 are made universal. Each sensor can be powered either from
the AnDi4 or from an external power supply (see picture 4). The AnDi4 supplies an unregulated
DC voltage in the range from 15 to 17 V. This power supply can source a current of minimum
35mA and is protected against short circuit. The type of measured signal has to be considered
when the sensors are connected. The AnDi4 can adapt two basic types of measured signals:
• A current which is proportional to the measured quantity:
a) In the range from 0 – 20mA or 4 – 20mA with the sensor working as a current sink.
b) In the range from 0 – 20mA or 4 – 20mA with the sensor working as a current source.
These sensors have separate connectors for power supply (U
signal (current).
• A voltage in the range 0 – 10V which is proportional to the measured quantity.
Connecting sensors
powered from AnDi4
Port X
+
U I
I
signal
Sensor 4 - 20mA
(current sink)
Picture 4: Connecting different type of sensors
User Manual AnDi1 / AnDi2 / AnDi3 / AnDi4 ·10/2017 · VERSION 1.3
Port X
+
U I
U
signal
Sensor 0 - 10V
P o w e r s u p p ly f o r s e n s o r
+
1 5 - 1 7 V D C , 3 5 m A m a x
U
In p u t fo r v o lt a g e m e a s u r e m e n t
I
In p u t fo r c u r r e n t m e a s u r e m e n t
G r o u n d p o te n tia l
, 0V) and for the output
B
Connecting sensors
with external power supply
Port X
+
U I
I
signal
Sensor 0 - 20mA
Sensor 0 - 10V
(current source)
external power supply
AnDi1/2/3/4
Port X
+
U I
U
signal
5