Hydronix Hydro-Control VI Installation Manual page 27

Chapter 3
Loop Power
Supply
Figure 13 shows the wiring diagram for connecting an analogue device that does not have a
power source. These sensors are also known as "two wire sensors".
Device
Current
Output
Figure 14: Connecting the current loop of an externally powered device
Figure 14 shows the wiring diagram for connecting an analogue device that has a separate
power supply which powers the current loop.
Voltage signal
0-10 v
Figure 15: Connecting a voltage signal to the Analogue Input
Figure 15 shows a method for connecting a 0-10v signal into the Hydro-Control. A series
resistance of 375Ω resistance is required. This can be obtained by placing two 750Ω resistors
in parallel. It is recommended to use resistors with a tolerance of ±0.1%.
Wiring analogue outputs
6.4
The analogue outputs from the Hydro-Control are designed as a constant current source.
+
-
Figure 13: Connecting a loop powered device
Device Power
Supply
+v
+v
0v
+
-
375Ω
Hydro-Control VI
Analogue GND
Figure 16: Analogue Output Wiring Diagram
Device
-
+
0v
+
Hydro-Control VI
125Ω
-
+
Current loop signal
0-20 mA
4-20 mA
-
Hydro-Control VI Installation Guide HD0455 Rev 1.9.0
Electrical Installation
Hydro-Control VI
+
-
Hydro-Control VI
+
-
Analogue GND
27