MEDC DB12 User Manual

Technical Manual for the

Sounder – DB12

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 2002 01/02

1. INTRODUCTION

These sounder units have been designed for use in harsh environmental
conditions.

2. INSTALLATION
General

When installing and operating electrical equipment, requirements for selection,
installation and operation should be referred to.

Additional national and/or local requirements may apply.

Ensure that all nuts, bolts and fixings are secure.
The DB12 Sounder should be positioned using the two available fixing holes in

the base. MEDC recommend that stainless steel nuts and bolts be used, if the
environment is corrosive.

The Sounder will operate in any attitude – from horizontal to vertical. However, it
is important to note that the alignment of the Sounder should ensure that:-

– Dust or debris cannot lodge or settle in the cover apertures.
– Water from hoses, jets or rain cannot settle in the cover apertures.

Cable Termination

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

Remove the cover/horn of the Sounder by unscrewing the 3 fixing screws, and
pulling the cover/horn gently away from 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 the correct 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
sounder.

In order to maintain the NEMA/IP rating of the unit, the cable glands should be
sealed to the unit using a suitable sealing washer.

Once termination is complete, replacing the cover/horn is a reverse process of
the removal, but care should be ataken to ensure that the seal is securely located
in its groove during re-assembly.

01/02 © MEDC 2002

GENERAL ARRANGEMENT

3. OPERATION

The unit is initiated directly from the power source.
For all versions, a 5-way DIL switch selects the tone required from the list shown.

The DB12P unit can only be switched between any of the two tones listed by
either:-

• Reversing the polarity of the power supply, or

• By a wire common +ve system, switching between the two –ve lines.

4. MAINTENANCE

During the working life of the sounder, it should require little or no maintenance.
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 recommmended 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.

5. OPERATING TEMPERATURE

–40°C to +55°C.
–40°F to +131°F.

© MEDC 2002 01/02

SWITCH TONE Nom O/P

TONE FREQ/DESCRIPTION SETTING DESCRIPTION (dB(A)

12345 @1M)
1 Alt Tones 800/970 Hz at 1/4 sec 11111 99
2 Sweeping 800/970 Hz at 7Hz 11110 Fast Sweep(LF) 98
3 Sweeping 800/970 Hz at 1 Hz 11101 Med Sweep(LF) 99
4 Continuous at 2850 Hz 11100 109
5 Sweeping 2400-2850 Hz at 7 Hz 11011 Fast Sweep 107
6 Sweeping 2400-2850 Hz at 1 Hz 11010 110
7 Slow Whoop 11001 Slow Whoop 99
8 Sweep 1200-500 Hz at 1 Hz 11000 Din Tone 99
9 Alt Tones 2400/2850 Hz at 2 Hz 10111 109

10 Int Tone of 970 Hz at 1 Hz 10110 Back-Up Alarm(LF) 99
11 Alt Tones 800/970 Hz at 7/8 Hz 10101 99
12 Int Tone at 2850 Hz at 1Hz 10100 Back Up Alarm(HF) 109
13 970Hz at 1/4 sec on 1 sec off 10011 99
14 Continuous at 970 Hz 10010 100
15 554Hz for 100mS / 440 Hz for 400mS 10001 French Fire Sound 95
16 Int 660 Hz 150 mS on 150 mS off 10000 Swedish Fire Alarm 93
17 Int 660 Hz 1.8 sec on 1.8 sec off 01111 Swedish Fire Alarm 93
18 Int 660 Hz 6.5 sec on 13 sec off 01110 Swedish Fire Alarm 93
19 Continuous 660 Hz 01101 Swedish Fire Alarm 93
20 Alt 554/440 Hz at 1 Hz 01100 Swedish Fire Alarm 95
21 Int 660 Hz at 7/8 Hz 01011 Swedish Fire Alarm 93
22 Int 2850 Hz 150 mS on 100 mS off 01010 Pelican Crossing 109
23 Sweep 800-970 Hz at 50 Hz 01001 Low Freq Buzz 95
24 Sweep 2400-2850 Hz at 50 Hz 01000 High Freq Buzz 107
25 3 970Hz pulses 0.5on/0.5off, 1.5 off 00111 100
26 3 2850Hz pulses 0.5on/0.5off, 1.5 off 00110 109
27 Int 3100 Hz 0.32s on / 0.68s off 00101 109
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

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 TM120-ISSA