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Figure 1 Electrical Connections For Testing And Reprogramming - Federal Signal Corporation Legend LGD Installation, Operation And Service Manual

Light bars

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Table Of Contents

Table of Contents

Making the Initial Electrical Connections

REVERSE POLARITY / MISWIRING: Reverse polarity or incorrect voltage

may damage the light. To avoid damage to the light, ensure that the battery

voltage is the same as the voltage rating of the light and that the correct

polarity is observed. If you are connecting to a cigarette lighter plug or 12 V

outlet, connect the positive wire to the center terminal and connect the

negative wire to the outer terminal.

The Legend does not require any internal wiring. Two 10 AWG power conductors

(red and black) and a CAT5 cable exit the light bar. The light bar's basic light

functions are communicated through the CAT5 cable, which connects to the Serial

Interface Module. (The Discrete-Wired 24-inch Legend does not connect to the

Serial Interface Module and has no CAT5 cable.) For wiring schematics, see the

Appendix starting on page 52.

To make the electrical connections for reprogramming the light bar:

1. To supply power to the light bar, use a fully-charged 12-volt automotive battery

with terminal lugs.

2. Place the light bar on a sturdy, flat surface.

3. Plug the CAT5 communication cable (1) from the light bar into the Serial Interface

Module (J1). See Figure 1.