Medc Ex ResistTel User Manual download pdf (Page 12)

Intrinsically safe terminals:

Protruding from the compound (see connecting diagram on page 17), a

12-pole intrinsically safe terminal row is intended for connecting the

receiver, which is permanently connected with the telephone housing,

terminals 1 to 4, as well as the intrinsically safe accessories, terminals 5

to 12.

The terminals 7 and 8 are intended for the connection of dynamic

receiver insets, like the ones used in second earpieces and headsets.

This output thus can be used for connecting a second earpiece or a

headset, which means that a second earpiece and a headset cannot be

connected simultaneously.

Terminal

Note Use

1 Dynamic receiver inset connection 1

2 Dynamic receiver inset connection 2

Receiver inset

3 Electret-foil microphone connection (+)

4 Electret-foil microphone connection (-)

Receiver

microphone

5 Electret-foil microphone connection (+)

6 Electret-foil microphone connection (-)

Headset

Microphone, not for

ZB version

7 Dynamic receiver inset connection 1

8 Dynamic receiver inset connection 2

Headset or

second earpiece

Jumper between the terminals 9 and 10

is identified by the telephone as

headset connected.

– in case of the ZB version – as

external loudspeaker connected.

Headset

identification or

–ZB version

–identification of

external

loudspeaker

11 Dynamic loudspeaker connection 1

12 Dynamic loudspeaker connection 2

External

loudspeaker

To connect accessories, you must replace the blind plugs screwed into

the telephone housing by explosion-proof cable glands (M20x1.5).

Before connecting intrinsically safe accessories, and if a system

certificate for the intended connection does not exist, the constructor

should perform an evaluation of the intrinsic safety according to the PTB

report “Zusammenschaltung nichtlinearer und linearer eigensicherer

Stromkreise“ (Interconnection of non-linear and linear intrinsically safe

electrical circuits), PTB-ThEx-10, from November 1999 (ISBN 3-89701-

440-9).

The technical data for the evaluation of the intrinsic safety can be found

in the chapter “Explosion protection – characteristic data”.

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Medc Ex ResistTel User Manual Page 12

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