Phase Selector Installation In Controller Cabinets With Existing Card Racks - OPTICOM 764 Installation Manual

5 Phase Selector Installation in Controller Cabinets with Existing Card Racks

CA/NY Type 170 (33X) controller cabinets and some NEMA cabinets have input files that will accept one or
two phase selectors. Power input and preemption output wiring is factory installed in the cabinet for the
phase selector. Power is provided for the phase selector at 120 VAC. Some cabinets may provide both 120
VAC and 24 VDC. In this case the phase selector will use 120 VAC.
WARNING
Improper or incomplete programming of the
traffic controller may cause improper
operation of the traffic signals, which may
result in accidents and/or injuries. To avoid
this problem, verify that the operation of
the traffic controller is appropriate for your
needs before, during, and after actuation of
the priority control inputs. Improper
operation of the traffic signals may result in
unsafe driver action.
In 170/33X cabinets, two input file slots are dedicated for use by phase selectors. These slots are usually J12
and J13 in the lower input file. They are pre-wired and have a direct association with particular priority
control inputs to the traffic controller. Both J12 and J13 supply two priority control inputs to the traffic
controller. Refer to your cabinet drawings to verify the slots, which are usually referred to as EVA, EVB,
EVC, or EVD.
The outputs from the phase selector are connected to the preemption inputs of the traffic controller. Each
phase selector output must be connected to a separate controller preemption input. Consult the manual for
your controller to determine if the preemption inputs are handled with the same priority. For some traffic
controllers, preemption inputs one and two are intended for railroad and draw bridge preemption and are
given precedence over the rest of the preemption inputs. When programming your priority control routines,
it is important to use values that will allow the traffic controller to respond to a priority control request as
quickly and safely as possible. If the routines are not programmed to respond quickly enough, the
requesting vehicle may not receive a green light in time to travel through the intersection safely.
Additional outputs are available on the model 768 auxiliary interface panel. See section 9-5 for details on
the additional outputs if needed.
Install the phase selector into slot J13 of the lower input file, making sure it is fully seated. See Figure 5-11.
Intersection Equipment Installation Instructions
21