Installation; Operation - MEDC DB18 Anleitung

English
1. INTRODUCTION
This loudspeaker, intended for use in potentially explosive gas atmospheres, has a power rating of up to 15 watts
and is suitable for use in all gas groups including hydrogen.

2. INSTALLATION

General
When installing and operating explosion-protected equipment, requirements for selection, installation and
operation should be referred to eg. IEE Wiring Regulations 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 listed or certified stopping plugs are used to blank off unused gland entry points and
that the NEMA/IP rating of the unit is maintained.
The DB18 is mounted via 2 off Ø7mm (Ø0.28") fixing holes in the 'U' shaped stirrup/mounting bracket. If
required, the unit can be initially placed via the Ø13mm (Ø0.51") central hole in the stirrup. The unit can be
rotated to the required position and fixed via the two other holes.
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 2 off screws holding the cover assembly to the base. Keep in a safe, accessible
location.
Remove cover to gain access to the interior.
Cable termination should be in accordance with specifications applying to the required application. MEDC
recommends that all cables and cores should be correctly identified. Please refer to the wiring diagram provided
with the product.
Ensure that only the correct listed or certified 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 speaker 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 con-nection where local codes or authorities permit or require such a
connection.
Once termination is complete, carefully push the cover assembly back onto the base, avoiding damage to the
mating surfaces. Please Note: The cover should be fitted in the orientation as supplied by MEDC to avoid the
cover fouling on the internal components. Replace the 2 off screws into the holes in the cover assembly and
tighten evenly.

3. OPERATION

The operating voltage of the unit is stated on the unit label.
The speaker is available as a 15W version only.
Different sound levels can be obtained by selecting the transformer tappings in the unit (see table below)
TRANSFORMER
TAPPINGS
1:2
2:3
3:4
1:3
2:4
1:4
© MEDC 2003
POWER
15W
15
7.5
5
4
2
0.8
11/07