Scoreboard 3450 Manual: Electrical Installation

ELECTRICAL INSTALLATION

We recommend a qualified electrician perform the needed electrical connections to ensure proper operation of the scoreboard.  These connections include grounding the scoreboard, connecting the scoreboard to a power source, installing the horn, installing the SL-230 / 330 or the control cable, and connecting the control console.

Ground Connection

The National Electrical Code requires a scoreboard (electric sign) to be grounded.  Grounding the scoreboard helps the scoreboard electronics operate properly and helps minimize damage if it is struck by lightning.  Metal posts do not provide an adequate ground path.  The following steps describe how to connect the scoreboard to the power source:

1. Drive one or more 5/8” x 8’ copper clad ground rods in the soil near the scoreboard.
2. Connect #6 bare copper wire to the ground rods using 5/8” brass tear drop connectors.
3. Figure 6 shows the location of the access panel and the dome plugs.

Figure 6  Rear Access Panel

1. Figure 7 shows the view behind the access panel.

Figure 7  Access Panel Removed

1. Pass the ground conductor through the right hand hole in the plate below the access panel and connect it to the ground lug (Ground) on the junction chassis.

Power Connections

The scoreboard requires 120 VAC service at the scoreboard to operate properly.  Maximum power consumption of Model 3450: 168 Watts.  Make sure that power cable is rated for this electrical load.  Install the power cable in conduit.  Avoid running the power cable in close proximity to the control cable.  The following steps describe how to connect the scoreboard to the power source:

1. Feed the power cable through the middle hole in the plate below the access panel.
2. Crimp fork terminals to the power cable wires.
   1. Connect the AC line wire and AC neutral wire to the Main Power terminal block on the junction chassis according to Figure 8.

Figure 8  Power Connections

Install a power disconnect that isolates all current carrying conductors on one of the posts below the scoreboard (not the ground conductor).  If a secondary switch is installed near the scorekeeper’s table, it should also isolate these conductors.  Place the power disconnect in the OFF position between games to help protect the scoreboard from lightning damage.  A power disconnect on the scoreboard post also provides a convenient way of turning the scoreboard off during maintenance or repairs.

Horn Installation

The items provided to install the horn are the horn, the weatherproof back box, the mounting bolts, and the mounting bracket.  Items which are not provided but are necessary for proper installation are ¾” flexible conduit, a ¾” right angle male conduit connector, a ¾” straight male conduit connector, two wires, and four forked crimp terminals.  The electrical requirements for the horn are 0.35 A 120 VAC.  The horn assembly is mounted on top of the scoreboard. For scoreboards with top sponsor panels the horn assembly is mounted on top of the sponsor panel.  At the mounting point a steel bar is riveted inside the scoreboard or sponsor panel’s aluminum extrusion frame.  The bar has a tapped hole.  A mounting bolt is screwed into the tapped hole at the factory.  The following steps describe the assembly and mounting of the horn:

1. Remove the mounting bolt from the scoreboard.
2. Cut a piece of ¾” conduit of sufficient length to reach from the horn mounting point to one of the holes in the plate below the upper access panel.
3. Attach the ¾” right angle male conduit connector to one end of the conduit and the ¾” straight male conduit connector to the other end.
4. Cut two pieces of wire of approximately 7 feet longer than the conduit.
5. Push the wires through the conduit.
6. Push the end of the conduit with the right angle male conduit connector through the 2” diameter hole in mounting bracket.
7. Screw the provided conduit plug into the hole near the word “TOP” inside the weatherproof back box.
8. Feed the wires through the other back box conduit hole and screw the right angle conduit connector to the back box.
   1. Attach the weatherproof back box to the mounting bracket using the provided 8-32 x 1/2” Phillips head machine screws, #8 split-lock washers, and 8-32 hex nuts as shown in figure 9.

Figure 9  Back Box Mounting Points

1. Remove the horn signal mounting plate from the horn base by loosening the Phillips head screw on the base as seen in figure 10.

Figure 10  Horn Signal Mounting Plate Screw

1. Pass the two wires that are inside the back box through the horn signal mounting plate center hole from the rear.
2. Align the horn signal mounting plate with the back box so that the word “TOP” on the horn signal mounting plate and the back box should be oriented in the same direction and the screw hole on the bottom edge of the horn signal mounting plate should be directly over the gap in the back box gasket as seen in figure 11.
   1. Fasten the horn signal mounting plate with the four 8-32 x 7/16” machine screws that are provided with the back box.

Figure 11  Horn Signal Mounting Plate Attachment

1. Crimp forked terminals on the ends of the two wires and attach them to the plug receptacle seen in figure 12.

Figure 12  Plug Receptacle Wire Attachment

1. Slide the slot on the side of the horn base over the tab on the horn signal mounting plate and tighten the Phillips head screw on the other side of the horn base.
2. Fasten the horn assembly to the scoreboard using the mounting bolts from the scoreboard as seen in figure 13.

Figure 13  Horn Assembly and Mounting

1. Crimp forked terminals on the ends of the two wires that protrude out of the other end of the conduit.
2. Pass the wires through one of the holes in the plate below the upper access panel.
3. Fasten the conduit connector to the plate and connect the wires to the terminal block labeled Horn.  Connect the AC-L wire to the left terminal and the AC-N wire to the right terminal.

SL-230 / 330

The SL-230 / 330 RF MODEM SYSTEM is designed to eliminate the control cable between the scoreboard and the control console on Electro-Mech Scoreboard MM and MP series scoreboards as well as all LED scoreboards.  If you have purchased this accessory, disregard the section of this manual titled Control Cable Installation.  Refer to the installation manual provided for this product.

Serial Data Output Connections

Customers who have purchased a set of delay of game timers can provide one unit with serial data from this scoreboard.  This connection is an alternative to providing a delay of game timer with serial data from the control console via the control cable or a SL-230 / 330 RF modem.  Do not connect the second delay of game timer to this scoreboard.  The following steps describe how to transmit serial data from this scoreboard to one delay of game timer:

1. At the rear of the scoreboard, feed data cable (same type of cable specified for control cable on page 3) through a hole in the plate below the access panel.
   1. Crimp fork terminals to the cable wires and the shield.
   2. Connect the cable to the terminal block labeled Serial Data Output on the junction chassis according to figure 14.

Figure 14  Serial Data Output Wiring Diagram

1. Remove the delay of game timer rear access panel.
2. Feed the cable through a hole in the plate below the access panel.
   1. Crimp fork terminals to the cable wires and the shield.
   2. Connect the cable to the terminal block labeled Control Cable on the delay of game timer junction chassis according to figure 15.

Figure 15  Control Cable Wiring Diagram

1. Reinstall the delay of game timer rear access panel.

Control Cable Installation

The control cable connects the scoreboard to the control console.  Install the control cable in conduit.  If the cable is ever damaged, it is easier and less expensive to replace a cable in conduit.  A small junction box with a ¼” stereo jack mounted on the face plate is attached to the control cable at the point of operation of the scoreboard.  This junction box should be securely mounted in a clean, dry area within ten feet of the rear of the control console.  Most customers order the control cable with the junction box attached.  Some customers prefer to attach the junction box after the cable is installed.  Those customers must solder the control cable to the ¼” stereo jack.  Figure 16 shows the control cable wire connection points on the rear of the ¼” stereo jack.

Figure 16  ¼” Stereo Jack Wiring Diagram

The following steps describe how to connect the control cable to the scoreboard:

1. At the rear of the scoreboard feed the control cable one of the holes in the plate to the left of the access panel.
   1. Crimp fork terminals to the control cable wires and the shield.
   2. Connect the control cable to terminal block labeled Control Cable on the junction chassis according to figure 17.

Figure 17  Control Cable Wiring Diagram

1. Reinstall the access panel.

Control Console Connections

The 10 ft. extension cable has two molded ¼” stereo plugs attached to it.  It is used to connect the control console to the junction box.  The following steps describe how to connect the control console:

1. Plug one end of the extension cable into ¼” stereo jack on the junction box.
   1. Plug the other end into the ¼” stereo jack mounted on the control console back plate.
   2. Plug the control console power cord into a grounded NEMA 5-15R 120 VAC receptacle.

Control Console Safety Warning

This product is equipped with a 3-wire grounding type plug, a plug having a third (grounding) pin.  This plug will only fit into a grounding-type power outlet.  This is a safety feature.  If you are unable to insert the plug into the outlet, contact a qualified electrician to replace your obsolete outlet.  Do not defeat the purpose of the grounding-type plug.