Daktronics Galaxy AF-3500/3550 - Manual (Page 10)

6 Power Installation
3.3 Power Requirements
Install this display according to all applicable local and national electrical codes. This includes proper
grounding and bonding of the display.
Do not connect the display to any voltage other than that listed on the Daktronics product label.
Displays use single-phase power. Proper power installation is imperative for display operation. Find power
specifications on drawings shipped with the display.
Important Notes:
• Daktronics recommends that a separate circuit be run to the electronic display(s) to isolate it and
prevent any issues that could be caused by line voltage fluctuations or high frequency noise on the
power line caused by other types of equipment. A separate circuit also makes display maintenance and
troubleshooting easier. Daktronics assumes no liability for any issues caused by line voltage fluctuations
or other improper power conditions if these recommendations are not followed.
• Size conductors of circuits that deliver power to the display according to national and local electrical
codes so the power distribution system delivers full-load power to the display while maintaining a
voltage within 5 percent of the utility nominal voltage.
Main Disconnect
Daktronics requires using a power disconnect switch with the display. Use a disconnect so that all
ungrounded conductors can be disconnected near the point of power connection.
Locate the disconnecting means either in a direct line of sight from the display or so it can be locked in the
open position. This ensures that power is not reconnected while service personnel work on the display.
3.4 Power Grounding
Ground displays according to the provisions
outlined in local and national electrical codes.
Install these displays using the provided ground
and neutral conductors. The power cable must
contain an isolated earth-ground conductor.
Do not connect neutral to ground at the disconnect
or at the display. This violates electrical codes and
voids the warranty.
3.5 Display Grounding
Connect the display system to earth ground as
shown in
Figure 4. Proper grounding protects the equipment from damaging electrical disturbances and
lightning. The display must be properly grounded or the warranty will be void.
Important Points About Grounding
• Resistance to ground 10 ohms or less: This is required by Daktronics for proper display performance.
If the resistance to ground is higher than 10 ohms, install additional grounding electrodes to reduce the
resistance. The grounding electrode should be installed within 25' (7.6 m) of the base of the display and
must be connected to the ground lug on the back of the display. Refer to
Figure 4.
Primary
Mirror
Display
Ground Lug
Thermal Weld
Connection
Preferred
Conduit
Copper Ground Conductor
(One Per Display Face)
Copper Ground Rods
8 ft.(2.5 m)
min.
8 ft.(2.5 m)
min.
Figure 4: Correct Grounding