Hardware Installation
18 Andover Controls Corporation
Wiring Inputs
Caution
Do not remotely ground any part of the sensor wiring. Remote grounds
connected to the ACX 780/781 return terminal could make the controller
operate incorrectly or damage the equipment. The signal return is not true
earth ground. It is an electronic reference point necessary to interpret the
sensor properly. Do not externally ground sensor or switch terminals that
return to the ACX 780/781.
Caution
Card readers require shielded wiring.
Although two-wire inputs usually function properly with unshielded
sensor wire, you may need shielded wire if you run the wire as follows:
• In the same conduit with other noise-generating conductors such as
50/60 Hz AC power.
• In long runs close to large power-consuming or power-generating
equipment that can produce 50/60 Hz noise.
We recommend you run input wiring in a conduit separate from AC
power or output wiring and avoid long wiring runs.
The “supervisory” inputs are on the left side of the ACX 780/781. Input
wires should enter from the left side. Notice that the inputs are labeled
RET, IN1, IN2, RET, IN3, IN4, RET, IN5, IN6, and so on, for up to 32
inputs. The first return terminal goes to the first two inputs, the second
to the next two inputs, and so on.
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