Input Wiring - Distech Controls ECL-VAVS Installation Manual

Figure 12: Power Wiring

Input Wiring

Before connecting a sensor to the controller, refer to the installation guide of the equipment manufacturer.
£
For a wire length less than 75' (23m), either a shielded or unshielded 18AWG wire may be used.
£ For a wire up to 200' (61m) long, a shielded 18AWG wire is recommended.
£
The shield of the wire should be grounded on the controller side only and shield length should be kept as short as possible.
£
COM inputs (UIx) are internally connected to 24V COM.
Table 2 shows the available universal input (UIx) wiring methods
£
Dry Contact input.
£ Thermistor Input (for example, 10kΩ type II and III).
£
Resistive input, maximum 350kΩ (for example, use with 10kΩ and 100kΩ poten-
tiometers).
£ 0 to 20mA input used with a 2-wire, 0 to 20mA sensor powered by an external 24
AC/DC power supply.
£ 0 to 20mA input used with a 3-wire, 0 to 20mA sensor powered by an external 24
AC/DC power supply. It is recommended to supply the external power supply with
the same 24VAC as the controller.
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Controller 1
24V AC
24V COM
Controller
24V AC
24V COM
Sensor Input Type
Fuse: 4 A Max.
Fast Acting
24 VAC
Transformer
OPTIONAL GROUNDING:
All grounding is optional for
LON networks
2
AC
Input Connection Diagram
Digital Dry Contact
NO-NC
UIx
RTD/
Thermistor
COM
Potentiometer
10kΩ
165Ω
249Ω ¼W
UIx
0-20mA
-
Sensor
+
COM
24VDC
165Ω 249Ω ¼W
UIx
+
0-20mA
Common
Sensor
COM
24VAC
AC
UIx
To Digital
Input
COM
To Analog-
To-Digital
Converter
UIx
To Analog-
To-Digital
Converter
COM
To Analog-
To-Digital
Converter
To Analog-
To-Digital
Converter