Daktronics 4200 Series, Руководство по установке

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23 Electrical Installation
Section 7: Electrical Installation
This section provides general guidelines for connecting power to a 4200 series Daktronics digital
billboard. For display-specific power requirements, refer to the display-specific riser diagram or contact
the Project Manager. It is very important to provide the site-required power to the display as listed on
the system riser drawing. Low or poor power can result in dim content, parts of the display out, module
flickering, or display damage. It is also important to test the display ground to verify it is grounded to
10 ohms or less. Failure to properly ground the display can result in display damage and may null and
void any warranties. For displays that require a horizontal display splice, refer to
Daktronics Digital
Billboard Horizontal Power Splice in Appendix A.
7.1 Electrical Installation
1. Refer to the display riser diagram for site-
required power.
2. Run conduit from the main distribution
panel (provided by customer) to the display
power entrance(s). On a single section
display there is only one power entrance. On
multiple-section displays, there is a power
entrance for each level.
3. Loosen the six screws that secure the power
entrance cover and lift the cover off of the
power entrance. Refer to
Figure 21.
4. Feed power cable through the conduit into the power entrance.
5. Connect the ground wire to the ground lug at the bottom of the
power entrance box (green wire) and tighten to 45 in-lbs with a
3
/
16
"
Allen wrench. Refer to
Figure 20
6. Connect power line 1 (L1) to Line 1 of the tap and use a
3
/
16
" Allen
wrench to tighten to 57 in-lbs.
7. Connect power line 2 (L2) to Line 2 of the tap and use a
3
/
16
" Allen
wrench to tighten to 57 in-lbs.
8. Connect the neutral line to the neutral tap and use a
3
/
16
" Allen
wrench to tighten to 57 in-lbs.
9. Verify the breakers for the control equipment and surge suppressor
are on.
10. Verify the breaker for the Backlit ID is off unless there is a backlit ID.
11. Replace and secure the power entrance cover.
7.2 Display Grounding
Daktronics recommends that the customer install a ground rod.
Daktronics recommends 10 Ohms or less impedance. Multiple ground
rods may be needed to achieve this. Refer to local and national codes on
grounding and bonding methods.
Daktronics does not recommend using the support structure as an earth-ground electrode;
concrete, primer, corrosion, and other factors make the support structure a poor ground.
Note: The support structure may be used as an earth-ground electrode only if designed to do so.
A qualified inspector must approve the support structure and grounding methods.
Line 1
Line 2
Neutral
Ground
To Display
Figure 20: Power Distribution Block
Handle
Screw
Power
Entrance
Cover
Figure 21: Power
Entrance Access