2N SingleTalk, Руководство пользователя

Страница: 24 / 73

Mounting
– Universal version
2.3
23
Off-Panel Microphone Mounting
By default, the microphone is placed directly on board (see drawing for microphone
position). If required, a cable-equipped microphone is available, fitted to a holder of
the size of 25×25 mm with self-adhesive foil. This helps mount the microphone behind
any hole in the wall surface (a hole with the minimum diameter of 3 mm, or a group
of smaller holes of the same total area). Board of version 5 and higher has both
onboard microphone and the connector for external one. Switching to external
microphone is automatic (external microphone is detected).
The minimum distance between the loudspeaker and microphone centers is
90 mm.
With a smaller distance an acoustic coupling might occur. A bigger distance,
however, is allowed.
Warning

Make sure that the microphone hole is sealed properly against noise
coming from the cavity behind the wall in order and thus senses the lift
car sounds only!
Off-Panel Loudspeaker Mounting
By default, the loudspeaker is panel-mounted. Since half of 2010, every speaker is
connected by cable. It allows installation of amplifier module. You can also slide the
loudspeaker out of its panel bed and place separately, if necessary.
See safety
notice in this case, see bellow!
Caution

In that case seal the loudspeaker properly to eliminate acoustic short-
circuit between the front and back loudspeaker sides (the grid may in no
case overreach the loudspeaker area to avoid acoustic short-circuit.
Safety

Keep the minimum electric isolation between the panel and the
loudspeaker of 1500 V.

Keep the minimum isolation distance between the panel and the
loudspeaker of 1.5 mm.

40 mm speaker is equipped with a rubber sealing. Do'nt
remove it!

50 mm speaker must be placed at insulating (non-metallic)
surface. Otherwise, ask manufacturer for an external panel,
as shown at right (it is n ot included).
Caution

You are not recommended to install the microphone and loudspeaker on
relatively distant places in the lift car (e.g. one on the ceiling and the
other on the wall) because the users should easily locate the loudspeaker
(its grid or perforation) and expect to find the microphone close to it.