MEDC PAS1 User Manual

Technical Manual for the

Horn – DB1P UL

DB1HP UL

Please note that every care has been taken to ensure the accuracy of our
technical manual. We do not, however, accept responsibility for damage,
loss or expense resulting from any error or omission. We reserve the right
to make alterations in line with technical advances and industry standards.

© MEDC 2003 02/10

1. INTRODUCTION
These horn units have been designed for use in harsh environmental conditions.

2. INSTALLATION

General

When installing and operating explosion-protected electrical equipment, require­ments for selection, installation and operation should be referred to eg. IEC
60079-14 worldwide and the ‘National Electrical Code’ in North America.
Additional national and/or local requirements may apply.

Ensure that all nuts, bolts and fixings are secure.

Ensure that only the correct UL listed stopping plugs are used to blank off unused
gland entry points and that the NEMA/IP rating of the unit is maintained.

The unit is mounted via 2 x Ø 0.31” (8 mm) fixing holes in the base. The fixing
holes have been designed to accept an M6 screw or bolt. MEDC recommend the
use of stainless steel screws.

Cable Termination

CAUTION: Before removing the cover assembly, ensure that the power to the
unit is isolated.

Unscrew and remove the 4 off screws holding the cover assembly to the base.
Keep in a safe, accessible location.

Twist the cover gently clockwise and anti-clockwise, whilst pulling it away from the
unit. Remove to gain access to the interior of the base.

Cable termination should be in accordance with specifications applying to the
application. MEDC recommend that all cables and cores should be fully identified.

Ensure that only correct UL Listed cable glands are used and that the assembly is
shrouded and correctly earthed.

All cable glands should be of an equivalent NEMA/IP rating to that of the unit
and integrated with the unit such that this rating is maintained.

The internal earth terminal (where fitted), must be used for the equipment ground­ing connection and the external terminal is for a supplementary bonding connec­tion where local codes or authorities permit or require such a connection.

Once termination is complete, carefully push the cover back onto the unit, avoid­ing damage to the mating surfaces. Replace & tighten the 4 off cover screws
evenly, to ensure maintenance of the required gap between the cover and enclo­sure.

02/10 © MEDC 2003

GENERAL ARRANGEMENT

/8" / 79mm

1

3

/2" / 140mm FIXING CRS

1

5

2 - HOLES 5/16" / 8mm

5 1/2" / 140mm FIXING CRS

1

/8" / 79mm

3

7

/8" / 175mm DIA

6

6 3/4" / 171mm DIA

/2") / 168mm (216mm)

1

/8" (8

5

6

/8" (6") / 105mm (152mm)

1

/16"

3

4

1

30mm

ALL DIMENSIONS IN INCHES AND MILLIMETERS

© MEDC 2003 02/10

SWITCH TONE
TONE FREQ/DESCRIPTION SETTING DESCRIPTION
12345

1 Alt Tones 800/970 Hz at 1/4 sec 11111
2 Sweeping 800/970 Hz at 7Hz 11110 Fast Sweep(LF)
3 Sweeping 800/970 Hz at 1 Hz 11101 Med Sweep(LF)
4 Continuous at 2850 Hz 11100
5 Sweeping 2400-2850 Hz at 7 Hz 11011 Fast Sweep
6 Sweeping 2400-2850 Hz at 1 Hz 11010
7 Slow Whoop 11001 Slow Whoop
8 Sweep 1200-500 Hz at 1 Hz 11000 Din Tone
9 Alt Tones 2400/2850 Hz at 2 Hz 10111
10 Int Tone of 970 Hz at 1 Hz 10110 Back-Up Alarm(LF)
11 Alt Tones 800/970 Hz at 7/8 Hz 10101
12 Int Tone at 2850 Hz at 1Hz 10100 Back Up Alarm(HF)
13 970Hz at 1/4 sec on 1 sec off 10011
14 Continuous at 970 Hz 10010
15 554Hz for 100mS / 440 Hz for 400mS 10001 French Fire Sound
16 Int 660 Hz 150 mS on 150 mS off 10000 Swedish Fire Alarm
17 Int 660 Hz 1.8 sec on 1.8 sec off 01111 Swedish Fire Alarm
18 Int 660 Hz 6.5 sec on 13 sec off 01110 Swedish Fire Alarm
19 Continuous 660 Hz 01101 Swedish Fire Alarm
20 Alt 554/440 Hz at 1 Hz 01100 Swedish Fire Alarm
21 Int 660 Hz at 7/8 Hz 01011 Swedish Fire Alarm
22 Int 2850 Hz 150 mS on 100 mS off 01010 Pelican Crossing
23 Sweep 800-970 Hz at 50 Hz 01001 Low Freq Buzz
24 Sweep 2400-2850 Hz at 50 Hz 01000 High Freq Buzz
25 3 970Hz pulses 0.5on/0.5off, 1.5 off 00111
26 3 2850Hz pulses 0.5on/0.5off, 1.5 off 00110
27 Int 3100 Hz 0.32s on / 0.68s off 00101

28 Spare/Customer Tone 00100
29 Spare/Customer Tone 00011
30 Spare/Customer Tone 00010
31 Spare/Customer Tone 00001
32 Spare/Customer Tone 00000

02/10 © MEDC 2003

3. OPERATION

3.1 The unit is initiated directly from the power source.
The DB1P & DB1HP units include two 5-way DIL switches to select any two

tones from the list. Use SW2 to select tone 1 & SW1 to select tone 2.

3.2 Single Stage Alarm (d.c. version only)

To operate as a single stage alarm, set the appropriate tone using SW1 and

connect input wires to TB1 (+ve) (red) and TB5 (–ve) (blue). Loop in and loop
out is then TB2 and TB6.

To operate in supervisory mode, reverse the voltage between TB1 and TB5

(such that TB1 is -ve and TB5 +ve).

Note that there is a diode mounted on the PCB which will inhibit the operation

of the sounder in the supervisory (reverse voltage) mode.

3.3 Two Stage alarm (d.c. version only)

To operate as a two stage alarm, set the required tones using SW2 for tone 1

and SW1 for tone 2.

3.3.1 Reverse Polarity Set Up
Connect input wires to TB1 (+ve) (red) and TB3 (–ve) (black), tone 1

will sound. Reverse the voltage so that TB3 is +ve and TB1 is –ve, tone
2 will sound.

3.3.2 Common +ve Set Up
Connect input wires to TB1 (+ve) and separate –ve’s to TB3 and TB5.

When TB3 is –ve tone 1 will sound, when TB5 is –ve tone 2 will sound.

3.4 Single Stage Alarm (a.c. version)

When the unit is powered with a.c. only a single stage alarm is available.

Tones should be selected using SW1. Connect input wires between TB1 and
TB3.

Note: In all set ups, loop in and loop out is facilitated by TB2, TB4 and TB6 as
appropriate.

4. MAINTENANCE

During the working life of the unit, little or no maintenance is required. However,
if abnormal or unusual environmental conditions occur due to plant damage or
accident etc., then visual inspection is recommended.

If a fault should occur, it is recommended that the unit be returned to MEDC for
repair. All parts are replaceable.

If you have acquired a significant quantity of units, it is recommended that spares
are also made available. Please discuss your requirements with the Technical
Sales Engineers at MEDC.

© MEDC 2003 02/10

5. CERTIFICATION/APPROVALS

Please refer to marking on the unit for specific approval details.

• ULlistedforusein Class1,Division1,GroupsC&D

USA (USL) Class 1, Zone 1, Groups IIA & IIB.

• ULStandards UL1203&UL464.

• Suitableforhazardouslocationre-alarmapplications.

6. CERTIFIED TEMPERATURE

–25°C to +55°C
–13°F to +131°F

02/10 © MEDC 2003

© MEDC 2003 02/10

MEDC Ltd, Colliery Road, Pinxton, Nottingham NG16 6JF, UK.
Tel: [phone] Fax: [phone]
Sales Enq. Fax: [phone] Sales Orders Fax: [phone] MEDC Stock No.
E-mail: [e-mail] Web: www.medc.com TM107-ISSB