Installation
2-10 Manual # 42-02-1P21
Low Voltage Signal Wiring
Low voltage signal wiring includes all 24-volt inputs. The inputs on the I/O boards can be
turned on with as little as 12 Vac. If the signal wires are run along side the 240 Vdc door opera-
tor wiring, an induced 12-volt spike is very likely to occur. Keep low level signal wiring at least
four inches from high power wiring to avoid false signal firing. If this is not possible, and the
low level wiring must cross the high power wiring, the two should cross at a ninety-degree
angle.
Traveling Cable Wiring
When laying out traveling cable wiring, it is always best to have the low voltage signal wiring
multiple layers away from any 14-18 AWG power wires and high voltage signal wires.
The number of required wires and twisted pairs is documented in the job prints. The travelers
are also identified by the use of yellow terminals in the top of the car junction box. Always allow
10% or more additional wires for spares.
On lower rise cars, it is often beneficial to run the traveling cable directly to the top of the car
junction box. This avoids terminating traveler wires at the midway and at the under-car junc-
tion box.
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