Federal Signal 400ST Installation Guide

MODEL 400ST

SERVICE INSTRUCTIONS FOR MODEL 400ST STROBE LIGHT

MODELO 400ST

INSTRUCCIONES DE SERVICIO PARA LA LUZ DE DESTELLO

MODELO 400ST

MODELE 400ST

INSTRUCTIONS DE SERVICE POUR LA LAMPE STROBOSCOPIQUE

MODELE 400ST

Address all communications and shipments to:

Dirija todos la correspondencia y envíos a:

Adressez toutes les communiations et expéditions à:

FEDERAL SIGNAL CORPORATION
Electrical Products Division

2645 Federal Signal Drive
University Park, IL 60466-3195

SERVICE INSTRUCTIONS FOR MODEL 400ST STROBE LIGHT

A. General.

SAFETY MESSAGE TO INSTALLERS

It is important to follow all instructions shipped with this product. This device is to be installed
by a trained electrician who is thoroughly familiar with the National Electrical Code and will
follow the NEC Guidelines as well as local codes.

The selection of the mounting location for the device, its controls and the routing of the wiring
is to be accomplished under the direction of the facilities engineer and the safety engineer. In
addition, listed below are some other important safety instructions and precautions you should
follow:

• Read and understand all instructions before installing or operating this equipment.

• Do not connect this light to the system when power is on.

• After installation, test the light system to ensure that it is operating properly.

• After testing is complete, provide a copy of this instruction sheet to all operating personnel.

• Establish a procedure to routinely check the light system for proper activation and operation.
Failure to follow all safety precautions and instructions may result in property damage, serious

injury, or death to you or others.
The Model 400ST Strobe Light is designed to provide high intensity warning flashes which

signal the presence of hazards or impending dangerous conditions The effective intensity of the
light is 400 candelas (clear dome) and the flash rate is approximately 75 flashes per minute.

The only electrical components which are designed to be replaced by the customer are the
flash tube, printed circuit board assembly and 3-ampere fuse located on the circuit board.
Paragraphs B. and C. describe replacement of these components.

The factory will service your equipment or provide assistance with technical problems that
cannot be handled satisfactorily locally.

Address all communications and shipments to:

FEDERAL SIGNAL CORPORATION

Electrical Products Division
Service Department
2645 Federal Signal Drive
University Park, IL 60466-3195

If any unit is returned for repair, it can be accepted only if we are notified by mail or telephone
in advance of its arrival. Such notice should clearly indicate the service requested and all
pertinent information regarding the nature of the malfunction and, if possible, its cause.

WARNING

High voltages are present inside the light assembly. Wait at least 5 minutes, after shutting off power,

before servicing this unit.

B. Flash T ube.

As strobe lights are used, flash tubes begin to darken causing the light output to decrease. This
darkening is characteristic of flash tubes and can be viewed through the top of the dome. It will
begin near the base of the tube and progress upward. Also, as flash tubes age, they may have a
tendency to misfire (not fire periodically).

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After extended operation, occasionally check for flash tube degradation. Should the tube
misfire, have a noticeable decrease in light output, glow continuously, or darken to a point
beyond that shown in figure 1; it should be replaced. Not replacing the flash tube when any of
the above conditions exist could cause a breakdown of other components on the printed circuit
board.

To replace the flash tube, proceed as follows:

1. Remove the four screws and chrome load bearing plates which secure the dome to the
housing assembly. Remove the dome.

2. Remove the three 8-32 nuts and dome mounting plate which secure the fresnel lens to the
mounting plate. Lift the lens away from the housing assembly.

3. Grasp the flash tube by its base and pull it out of the socket, using a gentle rocking motion.
Install a new flash tube and reassemble the light.

C. Fuse and Printed Circuit Board Assembly.

SAFETY MESSAGE TO MAINTENANCE PERSONNEL

Listed below are some important safety instructions and precautions you should follow:

• Read and understand all instructions before operating this system.

• Any maintenance to the light system must be done with the power turned off.

• Any maintenance to the light system must be performed by a trained electrician in accordance
with NEC Guidelines and local codes.

• Never alter the unit in any manner. Safety in hazardous locations may be endangered if additional
openings or other alterations are made in units specifically designed for use in these locations.

• The nameplate, which may contain cautionary or other information of importance to maintenance
personnel, should not be obscured if exterior of housings used in hazardous locations are painted.

Failure to follow all safety precautions and instructions may result in property damage, serious
injury, or death to you or others.

To replace the fuse or printed circuit board assembly, proceed as follows:

NOTE

If an audible device (speaker, horn, bell, etc.) is NOT installed in the unit, the fuse can be replaced

from the bottom of the unit by removing the four fastening nuts which secure the lower

housing and removing the housing.

1. Perform steps 1 and 2 in paragraph B (above).

2. Remove the four Phillips head screws and washers which secure the lens mounting plate to
the main casting.

3. Remove the four spacers from the rubber grommets.

4. Lift the lens mounting plate up and out. Remove the four rubber grommets from the notches
in the lens mounting plate. The 3-ampere fuse is now accessible for replacement.

5. With “long-nose” pliers, gently squeeze the four nylon self-locking supports and separate
the printed circuit board assembly from the lens mounting plate. Do this by squeezing the
tabs of the self-locking supports on the lens mounting plate side of the assembly.

6. Install the new printed circuit board on the mounting plate via the nylon self-locking
supports mounted on the new printed circuit board.

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