Daktronics CH-2024V User Manual

Auto Racing Display

Model CH-2024V

Installation & Service Manual

ED 5900
Project#1081
Rev. 5-10 August, 1998

Copyright © 1991 Daktronics, Inc.

All rights reserved. While every precaution
has been taken in the preparation of this
manual, the publisher assumes no
responsibility for errors or omissions. No part
of this book covered by the copyrights
hereon may be reproduced or copied in any
form or by any means - graphic, electronic,
or mechanical, including photocopying,
taping, or information storage and retrieval
systems - without written permission of the
publisher.

ED 5900

DA
KTRONICS, INC.

Setting New Standards Worldwide

P.O. Box 5128 331 32nd Ave. Brookings, SD 57006
Phone [phone] or [phone] Fax [phone]

Table of Contents

1. Introduction .............................................................................................................1-1

1.1 How To Use This Manual ..........................................................................................1-1

1.2 Display Overview.......................................................................................................1-1

2. Installation ...............................................................................................................2-1

2.1 General System...........................................................................................................2-1

2.2 Beam and Footing Selection.......................................................................................2-1

2.3 Display Mounting.......................................................................................................2-2

2.4 Electrical Installation..................................................................................................2-2

2.4.1 Control Signal Cable.....................................................................................2-2

2.4.2 Power Wiring ................................................................................................2-3

2.4.3 Connection Between Sections.......................................................................2-3

3. Maintenance & Troubleshooting............................................................................3-1

3.1 Lamp Replacement.....................................................................................................3-1

3.2 Lamp Driver...............................................................................................................3-1

3.3 Digit Segmentation.....................................................................................................3-2

3.4 Schematic ...................................................................................................................3-2

3.5 Troubleshooting .........................................................................................................3-2

3.6 Replacement Parts......................................................................................................3-3

3.7 Unit Exchange/Replacement Procedure.....................................................................3-3

Table of Contents i

Section 1 : Introduction

1.1 How To Use This Manual

This manual explains the installation and maintenance of the Daktronics CH-2024V auto
racing display system. Setup of other control equipment or operation of the CHTS-300 timing
console are not covered in this manual. For questions regarding the safety, installation,
operation or service of this system, please refer to the telephone numbers listed on the cover
page of this manual.

Important Safeguards:

1. Read and understand these instructions before installing.

2. Do not drop the control console or allow it to get wet.

3. Be sure the display is properly grounded with a ground rod at the display location.

4. Disconnect power to the display when it is not in use.

5. Disconnect power when servicing the display.

6. Do not modify the display structure or attach any panels or coverings to the

display without the written consent of Daktronics, Inc.

The box below illustrates Daktronics drawing numbering system. The drawing number
“7087-P08A-69945” is how Daktronics identifies individual drawings. This number is
located in the lower-right corner of the drawing. This manual refers to drawings by listing the
last set of digits and the letter preceding them. In the example below, the drawing would be
referred to as Drawing A-69945. Referenced drawings are inserted at the end of the first

section which references them

1.2 Display Overview

Reference Drawing: Display, CH-2024V........................................Drawing A-46493

Drawing A-46493 shows a Daktronics CH-2024V display. The CH-2024V display along
with the use of the Daktronics CHTS-300 timing console can display the lap number or
elapsed race time, the top eight racers, and the race status.

Introduction

1-1

Section 2 : Installation

2.1 General System

Reference Drawings: Footing & Beam, CH-2024V.........................Drawing A-46492

System Layout, CH-2024V...........................Drawing A-46533

Display Mounting, CH-2024V.......................Drawing A-46534

Component Locations, CH-2024V................Drawing A-46539

Pwr&Sig Entrance Components...................Drawing A-46545

Connector Plate, CH-2024V.........................Drawing A-46563

Color Code, 25 Pin J-Box.............................Drawing A-47207

Electrical Installation, CH-2024V..................Drawing A-47326

The CH-2024V display consists of three sections, the upper, middle and lower sections.
Refer to Drawing A-46533 for the general system layout.

The general procedure for installing the CH-2024V display is as follows:

1. Select beam and footing recommendations from the table in Section 2.2.

2. Dig the footing holes and install the beams and the footings.

3. Route power and signal cables to the display and the control locations.

4. Mount the displays to the beams as described in Drawings A-46492 and A-46534 and
Section 2.3.

5. Route power and signal wires into the displays as described in Drawings A-47326, A­46539, A-46545, A-46563 and A-47207 and Section 2.4.

2.2 Beam and Footing Selection

The table below contains recommendation for beams and footings to support your display.
The first column is wind velocity in miles per hour. The distance in the second column is
from the ground to the bottom of the display. The choice from these columns depends upon
the display location.

Wind Speed Height (ft) Beam

70 10 W 10x19 7 ½ ftx3 ft

MPH 15 W 10x25 8 ¼ ftx3 ft

80 10 W 10x25 8 ½ ftx3 ft

MPH 15 W 10x29 9 ¼ ftx3 ft

90 10 W 14x26 9 ½ ftx3 ft

MPH 15 W 12x31 10 ½ ftx3 ft

The beams listed are W-shape (wide flange) beams which provide maximum wind load
strength for the weight and the cost of the beams.

The calculations for footing diameters and depths are based on the assumption that footings
are in undisturbed soils, not fill soils. Lateral bearing capacity of 400 psf per foot of depth in
natural grade was used to derive these figures.

Section

Footing Depth x

Diameter

Installation

2-1

These footing recommendations are based on an allowable soil bearing pressure of 4000 psf
vertically and 400 psf/ft of depth horizontally. However, these recommendations are
suggestions only and each installation should be treated individually. Be sure that the
installation complies with local codes and is suitable for particular soil and wind conditions.
Daktronics assumes no responsibility for structures installed by others. Daktronics
recommends that W-sections of grade 36 steel be used for beams, and that 28-day (strength
4000 psi) concrete be used for footings.

2.3 Display Mounting

Reference Drawings: Display Mounting, CH-2024V.......................Drawing A-46534

Drawing A-46534 shows the typical mounting procedure for the display.

Note: The bolts that secure the display do not go through the beams, but run along both sides

of the beams, clamping the display to the beams.

Mounting angles and 1/2" hardware are provided to mount your display.

1. Starting with the bottom display section, lift the display into place on the mounting

beams.

2. Secure the bottom of the lower display section as shown in Steps 1 through 4 in Drawing
A-46534.

3. Secure the top of the display section with the mounting angles and the 1/2" hardware.

4. Tighten all nuts securely.

5. Repeat the same procedure for the middle and upper sections, starting with the middle

section next.

2.4 Electrical Installation

2.4.1 Control Signal Cable

Reference Drawings: Component Locations, CH-2024V...Drawing A-46539

Pwr&Sig Entrance Components......Drawing A-46545

Color Code, 25 Pin J-Box................Drawing A-47207

For the display, two conductors of 24 AWG are needed. For distances up to 600 ft. or
22 AWG, up to 1000 ft. are required. Daktronics has 24 AWG direct burial cable,
Daktronics part no. W-1105 with 6 conductors, and 22 AWG cable that must be
pulled through the conduit before burial, Daktronics part no. W-1077 with 2
conductors.

At the control location, mount the signal J-box to a convenient location. Route the
cables and connect to the wires leading from the connector into the J-Box cover
according to the table below and Drawing A-47207.

At the display’s bottom section, open the bottom hinged panel covering the entrance
enclosure as shown in Drawing A-46539. Remove the cover from the entrance
enclosure. Refer to Drawing A-46545 for an illustration of the components inside
the enclosure. Signal and power cables are routed into the rear of the display. There
are two knockouts for the conduit connection in the back of the bottom section. Refer

2-2

Installation