Daktronics AF-3400-133,171,216,260 - Manual (Page 24)

Electrical Installation 3-6
Incoming power is connected within the power termination enclosure. Complete the
following steps to terminate the hot and neutral wires at the termination block within
the enclosure. Refer to the appropriate Schematic Drawing for the particular display
section, (either Drawing B-222321, Drawing B-227282, or Drawing B-228917)
located in Appendix A.
1. Access the power termination enclosure by opening the module door in
section A102 as described in Section 2.2.
2. Route the power cables through the power conduit in the rear of the sign
and to the enclosure.
3. Power line terminations differ for displays with different input AC voltages.
Domestic Displays
a. For a 120/240 VAC single-phase display, connect “HOT” wires to
“Line 1” and “Line 2” terminals on TB41. Refer to Drawing B-
222321
b. For a 120/208 VAC display connect “HOT” wires to “Phase A”,
“Phase B” and “Phase C” terminals on TB41. Refer to Drawing B-
227282.
Foreign Displays
a. For 240 single phase displays, connect “HOT” wire to “Line 1”
terminal on TB41. Refer to Drawing B-228917.
b. For 240 VAC three phase displays, connect “HOT” wires to
“Phase A,” “Phase B,” and “Phase C” terminals on TB41. Refer to
Drawing B-227282.
4. Connect the white neutral wire to neutral bus.
5. Connect the green grounding wire to the grounding bus E41.
Main Disconnect
The National Electrical Code requires the use of a lockable power disconnect near
the display. Provide a lockable disconnect switch (knife switch) at the display
location so that all power lines can be completely disconnected. Use a disconnect so
that all hot lines and the neutral can be disconnected. The main disconnect should be
mounted at or near the point of power supply connection to the display. A main
disconnect is to be provided for each supply circuit to the display.
The disconnecting means must be located in a direct line of sight from the display or
outline lighting that it controls. This requirement provides protection by enabling a
worker to keep the disconnecting means within view while working on the display.
Exception: Disconnecting means that are capable of being locked in the open
position may be located elsewhere.
3.7 Computer to Display
The 133mm/171mm, AF-3400 large character displays are designed for quicker
signal and power connection to the display. There are seven different methods of
communication and, depending on the particular display, Daktronics provides a
separate manual for explaining the connection to the signal termination enclosure.