Vigilant ALIM9706 User manual

LT0372 Issue 1.10 21 March 2011 Page 1 of 4
PA0646
QE90 Audio Line Isolator Module ALIM9706
Installation and Operating Instructions
Description
The Vigilant® Audio Line Isolator Module ALIM9706 is an audio isolation and balancing/matching device
with variable or fixed gain. It was designed for use with QE90 and Microvac systems, and also for general
audio isolation purposes.
The ALIM9706 provides independent isolation of two audio signals (channels), with the gain separately
selectable for each channel.
The ALIM9706 can be used for various purposes, including:
As an isolation and/or line balancing transformer (with optional volume control) for background
music inputs connecting to the Local Inputs of QE90 Amplifiers, music input of T-GEN 50, etc. Refer
Fig.1 below.
To allow spurs on the WIP speech and PA speech busses in a networked QE90 system. Refer Fig.
4 and 5 below.
To provide the isolation and voltage reduction required when connecting the amplifier primary or
100V line output of a QE90, T-GEN 50 or similar system into the low level input of another amplifier
(or vice versa). Refer Figure 3 below.
Music Source 1
Music Source 2
ALIM9706
( See text for link
settings )
IN +
IN +
IN -
IN -
OUT +
OUT +
OUT -
OUT - IN
Amplifier 1
Amplifier 2
IN
IN
Figure 1 –Typical Use of ALIM for Background Music Isolation
Gain Settings
Each audio channel of the ALIM9706 can be set for one of four different gains (refer to Table 1 below):
If no volume control is required, links LK1 and LK2 on the ALIM9706 should be installed, and LK3
not installed. In this mode the ALIM9706 has unity gain.
When volume control is required, links LK1 and LK2 should be removed, and link LK3 installed in
the 2-3 position. In this mode the ALIM9706 has a maximum gain of about 0.3, but it can be
adjusted down to zero.
If one of links LK1 or LK2 is fitted and LK3 is installed in the 1-2 position, then a fixed gain of 0.04 is
selected.
If neither links LK1 nor LK2 are fitted and LK3 is installed in the 1-2 position, then a fixed gain of
0.02 is selected. This is suitable for fixed attenuation for 100W Microvac systems from amplifier
primary outputs to feed into another amplifier.
Figure 2 –ALIM 9706 Schematic

LT0372 Issue 1.10 21 March 2011 Page 2 of 4
Link Settings Summary Table 1 –Gain Settings
LK1
LK2
LK3 –1-2
LK3 –2-3
Gain
Max Input Voltage
fitted
fitted
not fitted
not fitted
1
3 Vrms
not fitted
not fitted
not fitted
fitted
Variable 0-0.3
10 Vrms
not fitted
not fitted
fitted
not fitted
0.02
15 Vrms
fitted
not fitted
fitted
not fitted
0.04
10 Vrms
not fitted
fitted
fitted
not fitted
0.04
10 Vrms
NOTE
On circuit board encoding;
Links LK1A, LK2A, LK3A apply to Channel A.
Links LK1B, LK2B, LK3B apply to Channel B.
Other link settings should generally not be used.
100V Line Coupling/Attenuation
The ALIM9706 can be used to couple an existing 100V speaker line into the low-level input of another
amplifier.The best method of achieving this is to use a capacitively-coupled 100V: 0.5 –2.0W 8 ohms line-
matching transformer (e.g. off a 100V line loud speaker) to reduce the voltage first, and feed this into the
ALIM9706 to provide volume control, as shown in Figure 3A.
The links on the ALIM9706 should be: LK1 and LK2 not fitted, LK3 in position 2-3 to provide volume control.
Figure 3A - 100V Line Coupling Using Transformer
However, by modifying the ALIM9706 and using external resistors a similar effect can be obtained, as shown
in Figure 3B below:
Modify the ALIM as follows:
(ALIM Revision 1 only). Remove D1A and D2A for Channel A, and/or remove D1B and D2B for
channel B. Not required on ALIMs Revision 2or later.
Set the links as follows:
Remove LK1 and LK2
Insert LK3 in position 2-3. This link must be installed even if you don’t need the volume control.
Figure 3B - 100V Line Coupling Using Resistors

LT0372 Issue 1.10 21 March 2011 Page 3 of 4
QE90 Network Spurs
Both the input and the output of each ALIM 9706 audio channel are capacitively coupled, allowing the use of
a DC supervision signal to detect the presence of an EOL resistor. The capacitors prevent the ALIM9706’s
transformer from shorting out the DC supervision signal.
With this feature the ALIM can be used to provide spurs for PA Speech and WIP Speech in a networked
QE90 system, as shown in the following diagrams.
Location
1
Location
3
Location
4
Location
2
Location
5
Location
6
Main Bus
Spur
Figure 4 –Typical QE90 Network System (with spur)
Figure 5 shows in more detail the wiring of the ALIM9706 at the location where the spur joins the main bus
(Location 2 in Figure 4). Other locations will not have a spur and so will not require the ALIM9706.
EXT
ALARM
PA
SPEECH
MUSIC
WIP
SPEECH
AUX
PABX
SPEECH
BACKUP
COMMS
BACKUP
COMMS
BUS
FIP
BUS
SPIF
+
_
+
_
SHIELDS
GND
Connect GND terminal to Chassis
as directly as possible at all locations.
Connect Shields to SHIELDS
terminal at one location only
56k
IN +
IN -OUT+
OUT -
56k
IN -
IN +OUT -
OUT +
ALIM9706
To Paging Console
Comms
To PA Speech
at previous panel
To PA Speech
at next panel
To WIP Speech
at next panel
To WIP Speech
at previous panel
To PA Speech
on bus spur
(other end connects
directly to QE90)
To WIP Speech
on bus spur
(other end connects
directly to QE90)
ALIM 9706 link settings should be set
for unity gain
Figure 5 –Use of ALIM9706 at QE90 Network Spur

LT0372 Issue 1.10 21 March 2011 Page 4 of 4
Mounting and Earthing
The ALIM9706 may be mounted:
on a DIN rail (see Fig 6)
on a gearplate or chassis using PCB standoffs. Suitable standoffs are listed under “Ordering” at the
end of this document.
The ALIM9706 should be connected to a suitable earth stud. An earth connection is provided for this
purpose and is located at the centre of the five-way input connector on the ALIM9706. Refer to Figure 3A/3B
and to the circuit board encoding.
Figure 6 –Layout and dimensions with plastic DIN rail mounts (supplied)
Ordering
The ALIM9706 is available as:
PA0646 PCB ASSY, QE90, ALIM9706, AUDIO LINE ISOLATOR (WEB)
It is supplied with plastic PCB holders and clips suitable for mounting directly onto DIN Rails. Multiple
ALIM9706s can be used to provide a number of audio inputs in a larger module. Alternatively the plastic
PCB holders can be removed and the module mounted on metal or plastic standoffs (not supplied).
Ordering codes for suitable standoffs are as follows:
HW0130 HARDWARE, PCB STANDOFF, PBR10 (10mm)
HW0131 HARDWARE, PCB STANDOFF, PBR13 (13mm)
HW0209 HARDWARE, PCB STANDOFF, PBR06 (6mm)
ALIM9706 Specifications
Physical Size (l x h x d)
(PCB only) 94mm x 45mm x 25mm + PCB standoffs
(in plastic holder) 98mm x 48mm x 50mm
Mounting type
PCB standoffs or DIN rail adaptor
Mounting hole pattern
83mm x 34mm rectangular footprint
Operating temperature
-5° C to +45° C
Max input voltage
See Table 1
Max current
Nil
No. of channels
2
Voltage isolation
Limited by maximum common mode voltage to earth (275V protection MOVs).
Gain
Up to unity gain. Set by links LK1, LK2, LK3 & VR (See Table 1)
Accessories included with ALIM9706
DIN rail mounts (see “Mounting and Earthing”, above).
Manufactured Tyco Fire Protection Products Distributed By:
by: 17 Mary Muller Drive, Christchurch 8022
PO Box 19-545, Christchurch 8241
New Zealand
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