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Installation
Binary outputs
The RTU Open has 8 binary outputs. You can connect each output to a maximum of 24 Vac/Vdc. Each output
is a dry contact rated at 3 A, 24 V maximum, and is normally open.
To size output wiring, consider the following:
•
Total loop distance from the power supply to the controller, and then to the controlled device
NOTE Include the total distance of actual wire. For 2-conductor wires, this is twice the cable length.
•
Acceptable voltage drop in the wire from the controller to the controlled device
•
Resistance (Ohms) of the chosen wire gauge
•
Maximum current (Amps) the controlled device requires to operate
Analog output
The RTU Open has 1 analog output that supports voltage or current devices. The controlled device must share
the same ground as the controller and have input impedance of 500 Ohms maximum for the 4-20 mA mode
on AO - 1.
To wire inputs and outputs
off
Turn
1
Connect the input wiring to the screw terminals on the RTU Open.
2
on
Turn
3
Set the appropriate jumpers on the RTU Open.
4
J3
W1
W2
W3
W4
W5
W6
*Formatting the controller may result in lost information and should only be done under the guidance of
Carrier Control Systems Support.
14
the RTU Open's power.
the RTU Open's power.
AO - 1
Battery Jumper
Format Jumper*
Input 11 mA Jumper
Input 11 Thermistor
Input 10 mA Jumper
Input 10 Thermistor Jumper
0 - 10 Vdc/4-20 mA
In (Do not remove)
Out
Out (mA not utilized on this channel)
In (default position)
Out (mA not utilized on this channel)
In (default position)
RTU Open
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