Daktronics DF-2100 - Manual (Page 17)

Power Disconnect
The National Electrical Code requires the use of a lockable power disconnect within sight of
or at the display. Follow these guidelines for correct connection:
• Connect the grounding electrode cable at the local disconnect, never at the display
driver/power enclosure.
• Use a disconnect that opens all of the ungrounded phase conductors.
In order for this device to provide protection, the power must be disconnected when the
display is not in use. The controller should also be disconnected from power and from the
signal j-box when the system is not being used. The same surges that may damage the
display's driver can also damage the controller's circuit.
Power Installation
For this type of installation, the power circuit must contain an isolated earth-ground
conductor. Power connects to the pigtail inside the display (Figure 7). The pigtail has three
wires: black (120 V AC line), white (neutral) and green (ground), and a 5-pin plug on one
end. The plug is connected to the mating plug on the transformer. Use wire nuts to connect
power wires to the pigtails.
Figure 7: Power Connection
To access the power pigtail inside the display, open the latch access fasteners on the digit
panels. Smaller models have a single door that opens from the right. Larger models have two
doors that open near the center. Use a screwdriver to turn the fasteners a half-turn
counterclockwise to open the panel. Remove two wing nuts to open the left panel, if present.
Figure 8: Example of Power Pigtail Location
Electrical Installation 9