Hardware Installation
20 SCX 920 Installation Guide
Caution
Although 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
60 Hz AC power.
• In long runs close to large power-consuming or power-generating
equipment that can produce 60 Hz noise.
We recommend you run input wiring in a conduit separate from AC
power or output wiring and avoid long wiring runs.
Caution
Follow the rules below when wiring inputs and outputs:
• Never lay wires across the surface of the printed circuit board. You
should bring input wires in from the left and output wires in from the
right.
• Bundle excess wires toward the back of the cabinet to avoid any
contact with circuit boards.
• Wires should never be within 1 in. of any component on the printed
circuit board.
• Keep cabinet free of foreign materials (extra power supplies, relays,
and so on).
• Be careful when stripping wire not to drop small pieces of wire
inside the cabinet.
If you violate any of these rules, the controller could malfunction.
Caution
Never apply a voltage to a thermistor. Doing so alters the thermistor’s
accuracy and reliability. You should replace a thermistor that has had
voltage applied to it. Never bring a soldering iron to within 3 inches of
the thermistor’s sensing tip.
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