Fireray 2000 Service et maintenance

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DOCUMENT CONTROL NUMBER

FIRERAY 2000 OPTICAL BEAM SMOKE DETECTOR

GENERAL

This document details the routine servicing and maintenance

procedures and provides a fault finding guide for the Fireray

2000 optical beam smoke detector.

The publication comprises:

Yearly checks

Fault finding guide

Alignment procedures

Testing

Spares list

When an incorrect response is obtained from a check, locate and

rectify the fault as described in Section 3.

When returning a faulty unit or PCB for repair, package it in the

bag that was used for its replacement.

ROUTINE CHECKS

The recommended routine checks must be carried out as stated.

2.1

YEARLY CHECKS

Inspect the Control Box, Transmitter and Receiver Units for

damage and ensure they are physically secure.

Clean the lenses on the Transmitter and Receiver Units. (If the

units are installed in a 'clean area' or dust free environment the

lenses need be cleaned only every two years).

Align and the test system as necessary.

FAULT FINDING GUIDE

This section details some of the possible faults which may occur

during testing of the Beam Detector Set. Most of the faults can

be easily rectified.

If the unit is suspected as faulty, retry the alignment procedure.

If the Beam Detector Set is still faulty replace the Beam

Detector Set with a new one.

If the problem persists, contact the Helpdesk at Sunbury.

SERVICE AND MAINTENANCE

Registered Office: 19-21 Denmark Street, Wokingham, Berks RG40 2QE

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Table 1 lists the internal controls and their function.

CONTROL

Signal

Alters the gain of the received signal from

Level (RV1)

the transmitter. If the gain is set too low the

Beam Detector Set will not work correctly.

Do not set to maximum position in

NORMAL working mode.

Test / Reset

Sets the AGC level for the alignment checks

Switch

(ON) and arms the Beam Detector Set after a

fire alarm (OFF). Reset can also be done by

removing the power for 2 seconds or by

connecting the external reset input to 0V.

Test/Reset switch is normally in the OFF

position.

Table 1 Controls and their Function

3.1

POSSIBLE CAUSES OF FAULT ALARMS

a) Receiver placed in the Reset state. Check that

the Test/Reset Switch (Fig. 1) is set to OFF.

b) The beam between the Transmitter and the

Receiver is obscured for more than 94% of the

beam area for one second. Check the beam is

not obscured or that the round glass areas on

the Transmitter or Receiver are dirty. Clean as

required.

c) Signal Level Control set too low at the

Receiver. Turn control (RV1) clockwise.

d) Receiver in Test mode. Ensure the Test/Reset

switch set to OFF.

e) Misalignment of the Transmitter and Receiver

detectors. Re-align as in the Alignment

procedure.

f) Loss of power. Check out the power supplies.

g) Source of infra-red setting of the alarm. Check

for sources of infra-red. For example: heat

emitting lights (eg, incandescent light bulbs),

direct sunlight, heaters and radiators at close

proximity to detectors.

FIRERAY 2000

01B-05-S1

1/01

FUNCTION

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