Ascotel® IntelliGate® 2025/2045/2065 as of I7.9
Installation
137
sy
d-
020
4/1.
7
– I7.
9
– 1
2
.2009
•
If the door intercom interface is DC-free and has a high input impedance (
≥
600
Ω
) connect the output path (in the loudspeaker direction) to Ta and signal
ground SGND.
•
If the door intercom interface is not DC-free and if it has a low input impedance
(< 600
Ω
), connect the output path (in the loudspeaker direction) to LS and sig-
nal ground SGND. In this case power the interface at the AC and AC' connections
via an external bell-ringing transformer with 8...12 VAC and set the volume con-
trol to minimum.
Connecting a loudspeaker system
The loudspeaker system is connected via a line input (e.g. audio input for advertis-
ing texts) or a microphone input. The input should have a priority circuit and a sep-
arate volume control. The priority circuit is used to fade out the background music
when an announcement is being made.
[1]
Jumper (1-2) for asymmetric input
R1, R2, R3 voltage divider when using a microphone input
Fig. 76
Schematic circuit diagram of the connection variant for a loudspeaker system
•
When using a microphone input on the loudspeaker system:
– Since microphone inputs are usually designed for low signal levels only, use a
voltage divider to reduce the signal from the door intercom interface (R1, R2,
R3).
– Use a screened cable for the microphone wires for the connection between
the PBX and the loudspeaker system.
– Connect the cable screening to the loudspeaker system only, not to the PBX
or else ground loop humming will occur.
•
Connect the loudspeaker system input to Ta and Tb.
•
Connect the priority circuit to TS and TS'.
R
1
330
Ta
Tb
TS
TS'
R
2
330
R
3
10
[1]
Loudspeaker system
Microphone input (Pin 3)
1
4
2
5
3
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