MEDC Ex ResistTel - Manual (Page 12)

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
9
10
Jumper between the terminals 9 and 10
is identified by the telephone as
headset connected.
or
– 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”.