Input Wiring - Distech Controls ECB-VAV UUKL Installation Manual

Input Wiring

Input options must be properly configured in EC- gfx Program to ensure correct input readings. The table below shows the controller's available universal
input designation. For terminal block connector wiring best practices, see General Wiring Recommendations. Inputs can be connected as follows.
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 the shield length should be kept as short as possible.
£ Dry Contact input.
£
Pulsed input.
£
Pulse input used with a 2-wire sensor powered by its own power source –
this input supports a maximum input frequency of 1Hz (500ms minimum ON/
OFF). Connect the pulse input according to the figure for a pulse meter that
can pull-down a +5VDC supply with a 10KΩ pull-up resistor (Internal supply
type).
£
RTD input (for example, 1000Ω).
£
Thermistor Input (for example, 10kΩ type II and III).
£ Resistive input, maximum 350kΩ (for example, use with 10kΩ and 100kΩ
potentiometers).
£ 0 to 20mA input used with a 2-wire, 0 to 20mA sensor powered by the con-
troller's internal 18VDC power supply.
£ An on-board 18VDC power supply can provide the necessary power for
20mA current loop sensor operation.
£
Connect a 249Ω resistor between the UIx and COM terminals.
£ 0 to 20mA input used with a 2-wire, 0 to 20mA sensor powered by an exter-
nal 24 AC/DC power supply.
£
Connect a 249Ω resistor between the UIx and COM terminals.
£
0 to 20mA input used with a 3-wire, 0 to 20mA sensor powered by an exter-
nal 24 AC/DC power supply.
£ Connect a 249Ω resistor between the UIx and COM terminals.
When daisy-chaining two or more controllers on one transformer, wire the
controller according to Figure 14.
£
0 to 20mA input used with a sensor powered by its own power source.
£ Connect a 249Ω resistor between the UIx and COM terminals.
£ Voltage input used with a 3-wire 0 to 10VDC or 0 to 5VDC sensor powered
by an external 24 AC/DC power supply.
When daisy-chaining two or more controllers on one transformer, wire the
controller according to Figure 14.
£
Voltage input used with a 0 to 10VDC or 0 to 5VDC sensor powered by its
own power source.
8 / 18
Sensor Input Type Input Input Connection Diagram
Designation
UIx
Digital Dry Contact
NO-NC
UIx
Pulse Meter +
-
Output
UIx
RTD/
Thermistor
Potentiometer
UIx
10kΩ
UIx
+
Sensor
-
UIx
-
Sensor
+
UIx
0-20mA
Sensor
+
Common
24VAC
UIx
+
Sensor
-
UIx
+
0-10V
Common
Sensor
24VAC
UIx
0-10V
+
Sensor
-
UIx
To Digital Input
COM
5 VDC
Controller
Pulse Input
Equivalent
10 kΩ
Circuit
UIx
To Pulse Count
COM
Accumulator
UIx
To Analog-To-
Digital Converter
COM
UIx
To Analog-To-
Digital Converter
COM
+18VDC
To Analog-
To-Digital
Converter
UIx
0-20mA
COM
249Ω / ¼W
249Ω ¼W
To Analog-To-
0-20mA
Digital Converter
UIx
COM
24VDC
249Ω ¼W
To Analog-To-
Digital Converter
UIx
COM
AC
249Ω ¼W
To Analog-To-
0-20mA
Digital Converter
UIx
COM
UIx
To Analog-To-
COM
Digital Converter
AC
UIx
To Analog-
To-Digital
COM
Converter