Download Explosion Proof Audible and Visual Alarm

Tom Cribb Road, Thamesmead
OPERATING AND INSTALLATION
London SE28 0BH
Tel: +44(0)20 8316 4477
INSTRUCTIONS FOR (UL & ATEX)
or (0)20 8317 1717
Fax: +44(0)20 8317 2400
YODALEX FLAMEPROOF AUDIBLE AND
Email: [email protected]
D7292 OPERATING
AND INSTALLATION
2
VISUAL ALARMS
– CLASS 1 DIVISION
1
www.cliffordandsnell.com
A division of Signature Ind. Ltd
Explosion Proof Audible and Visual Alarm
MAIN FEATURES
YO6
YL6
• Omni Directional high output sounder
• 2 stage alarm
• Independently selectable 2nd stage
• All units share a common explosion proof housing
• Reduced installation costs
• Meets Universal approval
• Low current consumption
• Dual cable entry, cable in – cable out
• LM6 aluminium enclosure
• Stainless steel fasteners
• Borosilicate glass dome for strength and protection
• Lens guard provided as standard
• Weather proof flame retardant ABS horn
• 7 lens colours in flame retardant polycarbonate,
V6
DIMENSIONS (mm)
Clear, Opal, Yellow, Red, Amber, Blue, Green
280mm
11”
• Designed to meet UL, Canadian and European (ATEX) Approvals
• Complies with PFEER regulations
• 32 selectable tones meeting international regulations
• Sound selection via DIL switches (see Tone Table on page 8)
• Cable entries M20 (Europe) via retained adaptors to ½” NPT (UL)
290mm
11 1/2”
as standard
TECHNICAL SPECIFICATION
• IP66 NEMA 4X
• Sounder
• Strobe
• Sounder/Strobe
145mm
5 ¾”
24Vdc
24Vdc
24Vdc
(YO6)
(V6)
(YL6)
110dB @ 1 mtr
5 Joules
350mA
220mA
570mA
OPERATING TEMPERATURES
150mm
6”
425mm
16 3/4”
MOUNTING
Mounting bracket provided. Holes 9mm dia. Pitch 75mm
Optional Position
APPROVAL SPECIFICATION
All dimensions quoted are approximate only and subject to change without notice as are
technical features resulting from continual development and improvement
V6
-35deg C to +60 deg C European IIB
-20deg C to +60 deg C European IIB+H2
YO6
YL6
Underwriters Laboratories UL Standards
– UL 464, UL 1203, UL 1638
Control No. 8N30 (Sounder YO6 and Combined Unit YL6)
Control No. 13JM (Strobe Only V6)
UL Classifications
– Class I Division 1 and 2, Gas Group BCD
– Class II Division 1 and 2, Gas Group EFG (Strobe only V6)
CUL Canada
– CSA C22.2 No. 25-M1966, CSA C22.2 No. 30-M1986
European Standards
– EN.50014:1997 + Amendments 1 & 2; EN.50018:2000:
EN.50281-1-1:1998
– Baseefa 02ATEX0212X (IIB)
– Baseefa 02ATEX2222X (IIB+H2)
– ATEX Directive 94/9/EC
IIB only
Page - 1 -
IIB + H2
D7324/3
THESE INSTRUCTIONS MUST BE READ AND UNDERSTOOD BEFORE CARRYING OUT
ANY WORK ON THE ALARM.
‘these alarms should only be installed by competent personnel’
Do not discard any packing material until installation is complete.
INSTALLATION AND OPERATING INSTRUCTIONS
These instructions apply to the following Alarm models:Flameproof audible range, sounder type YO6
YA60BDUL and
YA60CDUL
Flameproof visual range, strobe type V6
FL60BD50UL and
FL60CD50UL
Combined flameproof audible and visual range, type YL6 YL60BD50UL and
YL60CD50UL
These products are a range of audible and visual alarms approved for use in potentially flammable
atmospheres, and have been approved by Underwriters Laboratories to standards UL 1203, UL464
and UL 1638.
Models are available for use in hazardous areas with the following classifications:
Approval Classification
Sounders
YA60BDUL Class I, Div 1, Groups B, C, D
Class I, Zone I, Group IIB + H2, T4
Ex.d.IIB + H2.T4 (Tamb -25º to +60ºC)
YA60CDUL Class I, Div 1, Groups C, D
Class I, Zone I, Group IIB, T4
Ex.d.IIB.T4 (Tamb -35º to +60ºC)
Strobe
FL60BDUL Class I, Div 1, Groups B, C, D
Class I, Zone I, Group IIB + H2, T4
Ex.d.IIB + H2.T4 (Tamb -25º to +60ºC)
FL60CDUL
Class I, Div 1, Groups C, D
Class I, Zone I, Group IIB, T4
Ex.d.IIB.T4 (Tamb -35º to +60ºC)
Sounder/Strobe
YL60BDUL Class I, Div 1, Groups B, C, D
Class I, Zone I, Group IIB + H2, T4
Ex.d.IIB + H2.T4 (Tamb -25º to +60ºC)
YL60CDUL Class I, Div 1, Groups C, D
Class I, Zone I, Group IIB, T4
Ex.d.IIB.T4 (Tamb -35º to +60ºC)
An alarm approved for use in a particular gas group may be used in areas where the gas group is of
a lower hazard, for example, a Sounder YA60BDUL approved for Group B may be used in areas
where gas group C or D is present.
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D7324/3
All alarms are suitable for use in Class II, Division I, Groups E, F, G.
The range of alarms is also approved as meeting the following Canadian standards:CAN/CSA -E79-0-95
CAN/CSA -E79-1-95
CSA C22.2 No. 30 - M1986
CSA C22/2 No. 25 - M1966
In addition, the range of alarms is approved as meeting the European standards EN50014:1997
+AMENDMENTS 1 and 2, EN50018:2000, EN50281-1-1:1998 ATEX DIRECTIVE 94/9/EC EC Type Examination Certificate No. Baseefa02ATEX0212X and Baseefa02ATEX0222X.
The alarms are suitable for outdoor use.
The Yodalex alarms meet the requirements of standards BS EN 60529 : 1992, Degree of Protection
IP66 and of UL50 : Nema 4X Hosedown test.
General
The alarms must be installed in accordance with these instructions.
The alarms must also be installed in accordance with local codes and/or special requirements of any
authority having jurisdiction; including but not limited to the following:NFPA 72E; NEC.ART.760 ET AL.; CAN/ULC-5524-M86; CEC Part 1 Sec 32.
For Fire Alarm Service, the Audible Alarms YA60BDUL and YA60CDUL and the audible alarm
contained within the YL60BDUL and YL60CDUL are classified as Public Mode - For Fire Alarm
Service.
The Visual Alarms FL60BDUL and FL60CDUL and the visual alarm contained within the
YL60BDUL and YL60CDUL are classified as Private Mode - General Emergency.
The Alarms are marked:
Audible alarm YA60BDUL
YA60CDUL
Visual alarm FL60BDUL
FL60CDUL
Combined audible and visual alarm
YL60BDUL
YL60CDUL
For Fire Alarm Service
Private Mode, General Emergency
Audible Signal Appliance, Public Mode with
supplementary visual signal appliance, Private Mode
Appliances for Public Mode operation are intended to notify occupants or inhabitants of the area
covered by the fire-protective signalling system. Appliances for Private Mode use are intended to
notify only those persons directly concerned with the implementation and direction of emergency
action initiation and procedure in the area protected by the fire-protective signalling system.
The alarms are intended for connection to an alarm initiating and indicating circuit of a UL Listed
control panel.
Models for connection to DC supplies have a DC line status monitoring facility.
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D7324/3
PREPARATION
ENSURE THE SUPPLY IS OFF BEFORE COMMENCING INSTALLATION.
A. Check that you have the correct alarm to satisfy the system specification.
Gas group and temperature?
Audible or Visual alarm or both?
Supply voltage?
Sound signal selected ?
Strobe lens colour correct ?
Suitable mounting location ?
Cable connection and installation method ?
End-of-line alarm for dc monitoring ?
B. Location
Select a suitable location for the alarm with regard to the area to be covered by the sound or flash
signal.
The surface should be flat in the area of the fixings and the material suitable to carry the weight of
the alarm.
For a sounder, the sound signal pattern is omni-directional and the sounder should be mounted with
the Horn at the top.
For a strobe, the alarm should be mounted with the lens at the bottom and out of direct sunlight.
In exceptional circumstances, the alarms can be mounted horizontally or for the strobe, with the
lens uppermost. Do not mount the sounder with the Horn downwards.
The cable must be connected to the alarm via a sealed component and this must be located adjacent
to the cable entries in the alarm body.
Suitable sealing devices are a sealed threaded nipple or a sealed gland; the choice of device depends
upon the gas group applicable to the installation and on the chosen installation method.
There are two entries to the alarm body and one or both may be used depending upon the number of
cable cores required by the system arrangement.
It is preferable that the cable and its seal be fitted at the factory or approved workshop; however the
method for assembling the cable and sealed components is described below.
IMPORTANT
THE ALARM IS A PRECISION INSTRUMENT. TAKE EXTREME CARE WHEN
HANDLING.
Particular care is needed when removing or replacing components which form part of the
flameproof enclosure.
Exposed joint surfaces must be protected and not have contact with dust or dirt, or be knocked
against any object.
Page - 4 -
D7324/3
The end flanges must be fitted squarely and on no account is force to be used. The flange must not
be hammered, levered with a metal instrument or the fixing screws used to pull down the flange.
With care and patience, it will be found that the flange enters the body without difficulty.
A. Combined Sounder/Strobe
It is recommended that the unit be stood upright in a cup-shaped base holding the strobe section.
Remove the Horn from the sounder flange by unscrewing the three self-tapping screws (pozidrive
head) in the dome of the Horn.
Unscrew the four socket headed screws, two washers and o-ring in the flange. (Socket head wrench
4mm (5/32”) across flats). These screws will not be fully tightened if the alarm is not a factorysealed unit.
IMPORTANT
TAKE EXTREME CARE WHEN REMOVING THE SOUNDER FLANGE FROM THE MAIN
BODY.
DO NOT USE THE TRUMPET AS A LEVER.
Unplug the pressure unit cable from the PCB assembly.
The exposed joints must be kept clean of dirt and not damaged in handling.
Lay down the sounder flange assembly to one side on a clean piece of the packing material.
Cable connection
The sealed threaded nipple or sealed gland should be assembled with suitable approved cable
according to the manufacturers instructions. The external cable should be routed to a local junction
box, via approved conduit if appropriate.
Approximately 20cm (8 inch) tails are required inside the enclosure for connection to the terminals
on the PCB assembly. The terminals accept wires of 14-18 AWG or 2.5mm². The PCB assembly
may be lifted in its slide channels to give easier access to the terminals.
There are two entries to the enclosure; both may be used for cable connection via sealed threaded
nipples if required. Alternatively if only one entry is used for cable connection, the second entry
must be fitted with an approved stopping plug.
The alarm is supplied as standard with the enclosure entries fitted with M20 to 1/2” NPT adaptors
and one is fitted with an 1/2” NPT stopping plug.
The second entry is fitted with a dust cap. This must be removed and an approved fitting inserted
before installation.
If the second entry is required, the approved stopping plug may be removed and discarded and a
sealed cable fitting connected.
Page - 5 -
D7324/3
The adaptors form part of the approved flameproof enclosure and are locked in position. They must
not be loosened or removed.
An alternative connection option is to fit an M20 to 3/4” NPT adaptor with an M20 approved
stopping plug.
Only one sealed cable can be fitted with this option.
SOUND SIGNAL SELECTION
It is preferable if the sound signal selection is set at the factory or at an approved workshop.
To make the sound signal selection, refer to the table of sound signals and the switch positions for
the chosen sounds.
Doubly check you have selected the correct switch positions for your chosen stage 1 alarm signal
and for your chosen stage 2 alarm signal.
Check again before re-assembly of the alarm.
RE-ASSEMBLY OF THE ALARM
Reconnect the pressure unit cable connection; make sure this is secure.
Make sure the PCB assembly is correctly located in the slides in the body. Check that the flash tube
is clearly visible and centrally located in the glass dome.
Re-assemble the sounder flange to the main body but take care that the pressure unit wire is not
trapped in the joint, across the edge of the PCB assembly or between the head of the earth screw
and the pressure unit.
Check that the o-ring is properly fitted in the groove in the body.
Take care when fitting the flange. This must be inserted squarely into the main body. Force must
not be used, with patience it will be found that the flange enters without difficulty. There must be a
minimal gap between the flange and the body.
The screws must not be used to pull down the flange to the body.
Each socket screw should be fitted with a lock washer, flat washer and an o-ring. The o-ring must
locate in the groove at the base of the counterbore. Screw down the socket screws tightly.
Note: If the alarm has been in service and/or the socket headed screws in the flange have been
previously tightened, it is advisable to replace the o-rings (Part No. GR0192) before retightening the
screws.
Refit the Horn to the Trumpet using the three self-tapping screws.
B. Sounder only
The alarm may be stood on a clean surface on the flat base. The procedure should be followed as
described for the Sounder/Strobe alarm above.
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D7324/3
C. Strobe only
The alarm should be stood upright in a cup-shaped base that holds the strobe lens steady.
Remove the fixing screws, washers and o-rings in the base plate.
Connect the cable via the entries in the enclosure to the PCB assembly using the method described
for the sounder/strobe alarm.
Ensure that the ‘O’ ring is properly fitted in the groove of the body.
Refit the base plate carefully, ensure the flange is squarely located in the enclosure and there is a
minimum gap between flange and body. Ensure each socket screw is fitted with a lock washer, flat
washer and o-ring.
Screw down socket screws tightly.
Lens Colour Change
If it is required to change the lens colour of the strobe, it is necessary to purchase the required
colour’s strobe-flange assembly from your supplier.
INSTALLATION
Ensure that the mounting surface at the installed location is flat and suitable for carrying the weight
of the alarm.
Remove the bracket, fixing screws and washers from the bag in the carton. Assemble the bracket to
the alarm body enclosure using two off hexagon head set screw (m6x16mm), lock washer and flat
washer.
Check that the bracket is tightly secured to the alarm enclosure.
The fixings for the alarm to the mounting surface are two clear holes ∅9mm (0.35in) diameter on
75mm. (2.95in) centres.
Bolts (not supplied) for securing should be minimum length 25mm (1in) and 8mm (5/16”) diameter.
INTERCONNECTION OF ALARMS
Alarms may be connected in parallel, that is, up to ten alarms with common supplies may be
connected as a single system loop.
Both sets of terminals should be used to provide an “in” and “out” connection; the loop wire should
be broken to allow electrical supervision.
The “end-of-line” alarm may be fitted with a resistor across the supply connections to provide DC
monitoring of the loop cable status at the control panel.
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D7324/3
SYSTEM OPTIONS
Operating supply voltage
24vdc
Sound signal selections
32 (see table)
Alarm stages
Single or Two from all sounders
Line monitoring
DC By:
i) supply polarity reversal
ii) threshold (<1V.) method
Strobe
Separate terminals for independent supply
connection of +24vdc and OV
For a combined sounder/strobe alarm, the +24 V DC and OV
supply rails are linked on the PCB. If it is required that the
strobe be supplied independently from an alternative supply
but the OV can be common, remove the link “LK2, +24vdc”.
If a totally independent supply is required, i.e. both positive
and negative, remove link “LK1, OV” also.
The location of the two links is shown on the drawings, Alarm
Connection and Sound Signal Selection.
Lens colours
Clear; opal; red; amber; blue; green; yellow
Cable cores
The number fitted depends upon the system requirements
Refer to Alarm Connection and Sound Signal Selection
diagrams A to E for common system configurations
EARTHING
The alarm must be connected to a good quality earth.
Earthing points are provided both inside and outside the alarm enclosure. These earthing points are
identified with the Ground Symbol.
The internal earth connection must be used. The external terminal is for a supplementary bonding
connection and is used where local code or authorities permit or require such connection.
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D7324/3
MISCELLANEOUS DATA
Weight lb.oz (kg).
Combined Sounder/Strobe
Sounder
Strobe
11lb 6oz (5.2)
10lb 2oz (4.6)
9lb 8oz (4.3)
All metal castings are of LM6 aluminium alloy, corrosion resistant, anodised and outside surfaces
finished with a polyester paint coating.
The strobe dome is of clear borosilicate glass.
The sound-shaping components are of flame retardant ABS.
The coloured lens is of flame retardant polycarbonate.
WARNING : POSSIBLE ELECTROSTATIC RISK
The Horn and Lens may become electro-statically charged and should not be touched or rubbed
when in operational service. If cleaning is required follow the warning given on the equipment label
and clean only with a suitable damp cloth.
All external fasteners are of stainless steel.
All sounders have 32 sound signal selection. From the 32 sound signals, any signal may be chosen
as the first stage alarm and any signal for the second stage alarm.
Sound output level and current consumption depends upon the signal selected.
Typical sound output level at 1 metre is 110dB(A) and typical current consumption is 350mA. at
24vdc and 1000Hz. Current may increase by 120mA depending upon sound signal selected. Peak
current is approximately 500mA.
These values apply for Gas Groups C and D; for Gas Group B, sound output is reduced by typically
3dB.
All strobes have a xenon flash rate of 1Hz, one flash per second. The flash energy is 5 joules with a
typical current consumption at 24vdc of 220mA; peak current is 3.6A, falling to 1A in 300
microseconds.
UL Ratings
UL tests on the product have given the following ratings.
Sounder 24vdc;
Strobe 24vdc;
350mA;
220mA;
75dB(A) min.
60fpm; 30cd (3cd-35°C)
Light output for coloured lens;
Clear
Yellow
Amber
30 Candela
29
“
17
“
Red
Blue
Green
9 Candela
6
“
7
“
It is recommended that all threaded cable entries be sealed with a suitable non-setting thread sealent
to maintain IP66 (NEMA 4X) rating.
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D7324/3
The Yodalex alarms comply with the European Community Directives on Electromagnetic
Compatibility.
89/336/EEC.
‘This equipment is designed and manufactured to protect against other hazards as defined in
paragraph 1.2.7 of Annex II of the ATEX Directive 94/9/EC.’
US Design Patent 391 186
Registered design in Canada (D) 82144
PCT Patent Application GB97/02959.
Page - 10 -
D7324/3
SOUND SIGNALS
sound
Freq.
rept.
Signal
rate
sound switches
12345
SW1, SW2
special applications
Fire Alarms
1
Alternate two-tone
800-1000
0.5
11111
2
Alternate two-tone
2500-3100
0.5
01111
Security Alarms
3
Alternate fast two-tone
800-1000
0.25
10111
Increased Urgency
4
Alternate fast two-tone
2500-3100
0.25
00111
Security Deterrent
5
Alternate two-tone
440-554
0.4/0.1
11011
Evacuation Alarm, FRANCE
6
Alternate two-tone
430-470
1.0
01011
7
Alternate v.fast two-tone
800-1000
0.13
10011
8
Alternate v.fast two-tone
2500-3200
0.07
00011
9
Alternate two-tone
440-554
2.0
11101
Turn-out, SWEDEN
10
Continuous note
700
-
01101
All Clear, SWEDEN
11
Continuous note
1000
-
10101
12
Continuous note
1000
-
00101
13
Continuous note
2300
-
11001
14
Continuous note
440
-
01001
15
Interrupted tone
1000
2.0
10001
16
Interrupted tone
420
1.25
00001
17
Interrupted tone
1000
0.5
11110
18
Interrupted tone
2500
0.25
01110
19
Interrupted tone
2500
0.5
10110
20
Interrupted tone
700
6/12
00110
21
Interrupted tone
1000
1.0
11010
22
Interrupted tone
700
4.0
01010
Air-raid Alarm, SWEDEN
23
Interrupted tone
700
0.25
10010
Local Warning, SWEDEN
24
Interrupted tone
720
0.7/0.3
00010
Industrial Alarm, GERMANY
25
Int, fast, rising volume
1400
0.25
11100
26
Fast siren
250-1200
0.085
01100
27
Rising constant,fall
1000
10/40/10 1 0 1 0 0
Industrial Alarm, GERMANY
28
ISO 8201 Evacuation
800-1000
as std
00100
International Evacuation Alarm
29
Fast whoop
500-1000
0.15
11000
30
Slow whoop
500-1200
4.5
01000
Evacuation Alarm, Netherlands
31
Reverse sweep
1200-500
1
10000
Evacuation Alarm, GERMANY
32
Siren
500-1200
3.0
00000
Pre-vital Message, SWEDEN
switch settings: ON=1 and OFF=0
The PFEER sound signals recommended by UKOOA are:General Alarm
Sound Signal 15
Interrupted tone 1000 Hz
PAPA
Sound Signal 31
Reverse Sweep 1200-500 Hz
Toxic Gas
Sound Signal 11
Continuous Tone 1000 Hz.
Page - 11 -
D7324/3
DC ALARM CONNECTION AND SOUND SIGNAL SELECTION
Sounder
+24v dc
Strobe
0v
Strobe
0v +24vdc
Earth
Sounder
0v +24vdc
x
3
3
2
TB1
2
TB1
1
1
x
resistor (E.O.L)
4
4
LK1 removed
(link 0v)
LK1 (link 0v)
LK2 removed
(link +24v dc)
1
1
4
4
2
3
TB2
2
3
TB2
1
1
LK2 (link 24v dc)
resistor (E.O.L)
Earth
Connection
TB3
3
Pressure Unit Connector
(On other side of PCB)
Earth
Connection
4
4
3
TB3
2
2
resistor (E.O.L)
Pressure Unit Connector
(On other side of PCB)
Earth
Sound Selection
(On other side of PCB)
Sound Selection
(On other side of PCB)
Line monitoring by supply reversal
Single Stage Alarm, Sounder and Strobe
operate together
Line monitoring by supply reversal
Single Stage Alarm, Sounder and Strobe
operate separately
Strobe
+24v dc
0v
Sounder
& Strobe
Sounder
+24v dc
Earth
2
TB1
1
x
3
y
4
LK1 (link 0v)
LK2 removed (link 24v dc)
3
Earth
Connection
4
Pressure Unit Connector
(On other side of PCB)
TB3
2
1
4
3
2
TB2
1
to next strobe
Sound Selection
(On other side of PCB)
A. Two stage alarm by third core
Strobe shown with common 0v, with sounder
Line monitoring by supply reversal
Select alarm stage 1 on SW1
Select alarm stage 2 on SW2
To Next Sounder
NOTE: That the two stage control always operates as follows:The first stage sounds by supplying volts to a unit via control switch ‘x’,
This switch remains on and the second stage signal is controlled by
switching volts to the third terminal via switch ‘y’.
Page - 12 -
D7324/3
To Next Sounder
to next strobe
Strobe
+24v dc
Earth
Connection
0v +24v dc
(stage 1)
Earth
+24v dc 0v
(stage 2)
DC ALARM CONNECTION AND SOUND SIGNAL SELECTION
Line monitoring by threshold method (<1V)
Select alarm stage 1 on SW1
Select alarm stage 2 on SW2
Strobe operated from separate supply.
B. Two stage alarm by Supply reversal
Sound Selection
(On other side of PCB)
Pressure Unit Connector
(On other side of PCB)
LK2 removed (link 24v dc)
1
3
4
1
LK1 removed (link 0v)
0v
Line monitoring by supply reversal
Select alarm stage 1 on SW1
Select alarm stage 2 on SW2
Common supply to Sounder and Strobe
C. Two stage alarm by third core
Strobe flashes for both 1st and 2nd stages of
sound alarm.
Sound Selection
(On other side of PCB)
Pressure Unit Connector
(On other side of PCB)
LK2 (link 24v dc)
LK1 (link 0v)
4
1
2
TB1
TB2
TB3
2
3
4
1
2
3
4
1
3
2
TB1
TB2
To Next Sounder
& Strobe
x
Earth
Earth
Connection
y
Sounder & Strobe
0v
+24v dc
The first stage sounds by supplying volts to a unit via control
switch ‘x’, This switch remains on and the second stage signal is
controlled by switching volts to the third terminal via switch ‘y’.
NOTE: That the two stage control always operates as follows:-
TB3
2
3
4
1
2
3
4
Page - 13 -
D7324/3
To Next Sounder
& Strobe
x
+24v dc
Earth
Connection
y
Earth
DC ALARM CONNECTION AND SOUND SIGNAL SELECTION
Line monitoring by supply reversal
Select alarm stage 1 on SW1
Select alarm stage 2 on SW2
Common supply to Sounder and Strobe.
D. Two stage alarm by Third core
Strobe flashes for 2nd stage of sound alarm, link TB2/3 to TB1/2
Sound Selection
(On other side of PCB)
Pressure Unit Connector
(On other side of PCB)
LK2 removed (link 24v dc)
1
3
4
1
LK1 (link 0v)
0v
Line monitoring by supply reversal
Select alarm stage 1 on SW1
Strobe shown with common 0v, with Sounder
E. Single stage alarm
Sound Selection
(On other side of PCB)
Pressure Unit Connector
(On other side of PCB)
LK2 removed (link 24v dc)
LK1 (link 0v)
4
1
2
TB1
TB2
TB3
2
3
4
1
2
3
4
1
3
2
TB1
TB2
TB3
2
3
4
1
2
3
4
Page - 14 -
D7324/3
Earth
Earth
Connection
The first stage sounds by supplying volts to a unit via control
switch ‘x’, This switch remains on and the second stage signal is
controlled by switching volts to the third terminal via switch ‘y’.
NOTE: That the two stage control always operates as follows:-
To Next Sounder
x
0v
Sounder Sounder
& Strobe +24v dc
to next strobe
Strobe
+24v dc