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4.2 SM30 basic modules
On delivery the rear panel of the SM30
Control Centre (fig.5.1) contains the Line
Output Module and the Power Supply
Module, as well as the removable blank
module panels. (The last only in LBB
1280/30). Both modules are essential
components, without which the SM30
system will not function.
Line Output Module
As its name implies, the Line Output
Module terminates line level audio signals
for the ‘Call’ output (fig.4.2D) and ‘Music’
output (fig.4.2A).
These feed the inputs of their respective
amplifiers. Both signals are terminated on 5-
pole 180° DIN sockets, see fig.4.2 for wiring
details. For amplifier surveillance purposes,
it is possible to activate the built-in pilot
tone generator by means of a switch
(fig.4.2E) and to adjust the volume level
(fig.4.2F).
The module is fitted on the frontpanel with
two potentiometers; Alarm Volume Control
(fig.4.2C) and Attention Tone Volume
Control (fig.4.2B).
These allow the installer to set the output
volume of the internal signal generator to
the desired level for each of the two types of
signal tone.
The output volume level of the Call signal
has no preset (setting is done on both the
Microphone Input Module and the Call
Station Input Module).
Power Supply Module
This module contains the terminations for
both the mains power and emergency +48
VDC supply. The mains power socket
(fig.4.3A) is of the standard “Europlug”
type, and has a mains fuse holder built in.
To remove the mains fuse (fig.4.3B), first
remove the mains power cable (cord) from
the socket, and carefully insert a medium
sized screwdriver under the small lip of the
fuse cover (nearest the socket pins), and
gently twist the screwdriver to lever the fuse
holder out. A ‘Mate-N-Lok’ emergency
supply socket (fig.4.3D) is provided to allow
a +48 VDC supply to be connected.
An Earth terminal (fig.4.3C) is mounted on
the Power Supply Module to allow an extra
earth (ground) wire to be connected for use
with the Emergency Power Supply, or when
the mains power earth is inadequate.
Fig. 4.3
Fig. 4.2
+48
A
B
C
D
1
4
2
5
3
1
4
2
5
3
SM30 relay not active
during Call.
F
E
D
C
B
A
symmetric
Call Out
symmetric
Music out
Test signal
20 kHz
GB/SM 30 user manual 5/26/98 10:18 AM Page 10