LT0186 Issue 2.80
27 July 2012
Page 5 of 10
3
INPUT WIRING DETAILS
3.1 Auto/Isolate/Evac Switch.
The use of the Auto/Isolate/Evac switch is not recommended in fire panels compliant with AS 4428.1 or AS 7240.2, as
the isolate facility on this switch is a duplication of the AS 4428 Warning System Isolate or AS 7240 Alarm Devices
Disable function already provided on these panels, and there is no indication of the Isolate position.
However, the switch may be useful with older AS1603.4 fire panels, in which case the Isolate position should be
indicated.
An LED (and resistor) could be wired to turn on in the Isolate position via a spare switch contact (Figure B), or a fault
could be generated on the fire panel when the switch is in the Isolate position. For example, wire the ELD 0V connection
through the Auto and Evacuate switch contacts so a fault is generated in the Isolate position (Figure C).
Alternatively, if the Isolate position is to be disabled (but the Auto and Evacuate positions retained) remove the 10k
resistor from the Isolate switch and blank off the word
“Isolate” on the l
abel.
ISOL
+24V
AUTO
Yellow
LED
2K7
0V
EVAC
ISOL
AUTO
ELD
0V
EVAC
COM
A/I/E- Switch Wiring
Figure A
Isolate Indication via Spare Switch Pole
Figure B
Using Isolate Position to Generate Fault
Figure C
3.2 Background Music/Remote Paging
An external audio source can be connected to the T-GEN MUSIC input, J9, for background music, external paging, etc.
This source must have an isolated output, otherwise an audio isolating transformer, e.g. the ALIM9706 (part number
PA0646), must be used. Refer to LT0372 for the ALIM wiring arrangement.
A background music loom adapter consisting of a 2 way plug with red (SIG) and black (GND) wires is supplied with the
T-GEN.
Remote paging (non-emergency) can be achieved by using the PA0688 microphone preamp board. Refer to LT0371 for
details.
3.3 Microphone
An emergency PA microphone (part number ME0290) can be connected to J1 on the T-GEN.
For a remote emergency PA microphone, refer to LT0371 for using a PA0688 microphone preamp.
T-GEN 50
Master
Music
J9
Sound System
SIG
2.5Vrms max
GND
Mic Preamp
(see LT0371)
1
2
Screened cable
J1-1 MIC-
J1-2 MIC+
J1-3 PTT
J1-4 PTT
T-GEN 50
MASTER
A/I/E-
0V
10k
ISOL
EVAC
AUTO
RED
BLACK
