Daktronics C44 - Manual (Page 20)

2-6 New Track
Installation
Isolation Interface Mounting
The isolation interface is designed with all field cabling connections made with clamping
screw plugs, and all tower cabling connections made with supplied, D-type connector
cables. Field equipment which must be connected to the isolation interface includes all
photocells, all start-line equipment via the start line junction box, time slip printer, and
ET/MPH displays.
Mounting considerations consist of access to all previously mentioned field cabling,
proximity to C-44 timer (all interconnects made with standard 10' cables), position C-44
timer operator unrestricted view of isolation interface LED indicators, and adequate
clearance for any high traffic areas. An ideal mounting location would allow the C-44
operator to view both the C-44 monitor and the isolation interface front panel, yet not
restrict maintenance access (as depicted in Drawing A-56253). Refer to Drawing B-
91012 for suggested tower equipment location.
2.8 Field Wiring
Reference Drawings:
Iso. Interface Term Blk. Detail .................................................... Drawing A-56252
Iso. Interface Encl. Detail............................................................ Drawing A-56253
Start Box Int. Wiring.................................................................... Drawing A-72242
C-44 Start Line J-Box ................................................................. Drawing A-75431
Field Cabling; C-44 Timer........................................................... Drawing B-75554
Lay. w/AC clls,stlnJ-bx&C44CE.................................................. Drawing B-91012
Field Cabling for dwg B-91012 ................................................. Drawing B-114631
This section pertains to the field wiring of the drag strip. The wiring will be done as follows-
start line, intermediate, finish, and then tower. For all wiring, refer to the system diagram and
pay close attention to the field cabling diagram Drawing B-75554.
When making connections, make sure all equipment power is off!
Photocell Connection: Connect all photocells (except the start line photocells) in this
manner. Photocells are connected to the cables as per wiring instruction found in the power
board box.
Daktronics uses only 18 awg twisted shielded cable, Beldon part #8760 (Daktronics part #W-
1117) unless specified. The shield conductor provides protection from electrical noise and
interference. To provide proper protection, the shield conductor must be terminated at the
isolation interface end only. The field end of the shield should be cut back even with the outer
insulation of the cable and wrapped with an electrical insulation tape. When wiring
photocells to isolation, always jumper the unused photocells from positive to negative on
the isolation interface.
Start Line/Isolation Interface Wiring
The start line wiring consists of wiring the isolation interface, the start line junction box,
starter’s box interface, start line photocells, and the guard beam (optional).
Cables coming into the tower should come to the isolation interface. Refer to Drawings
A-56252, A-56253, A-72242, A-75431, B-91012, and B-114631 to aid in wiring.