12
Electrical Installation
Display Termination
Power enters the display through the rear wall near the panelboard. To connect power to the
display:
1.
Locate the A41 panelboard inside the display.
2.
Remove the panelboard cover to reveal the panelboard circuit breakers.
3.
Route the power cables through the 1
1
/
2
" conduit hub and into the A41 panelboard.
4.
Terminate each wire at the appropriate terminal block and earth-ground lug.
Conduit Sealing
Fill the ends of conduits entering the display with duct seal.
Module Connection
4-pin connectors make the low voltage power connections within the display. Power for each
module is provided with the use of one red, one orange, one blue, and one black wire. Power
connections are completed at the factory.
The modules receive 24 VDC power from the power supply groups. Power redundancy is
achieved with the 4-pin conductor and the 2 power supplies in the power supply groups. The
primary power supply runs power through 2 pins in the 4-pin connector, and the backup
connects to the remaining 2 pins.
Both lines are 24 VDC present at all times. The backup 24 VDC line only powers the module
if the primary line fails. Primary and backup 24 VDC lines alternate between odd- and even-
addressed driver modules in an effort to balance the load.
Fans and Power Supplies Connection
The fans and power supplies use 120 VAC from the panelboard. The surge suppressor in the
panelboard protects the power supplies and modules from damaging power surges.
4.6 Traffic Cabinet (Optional)
Individually wire the following items directly to the earth-ground rod with an 8 AWG or
larger wire according to the local and national codes.
•
Earth-ground lug mounted on the rear of the panelboard.
•
Conduit grounding collars.
•
Earth-ground connection inside the panelboard.
