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5-8
AS 1670.1 requires fire alarm warning systems to produce sounds complying with
AS 2220 or ISO 8201. One way of meeting this requirement in a 4100U system is to use
a T-GEN 50 tone generator, which is capable of driving up to 50W of load on a 100V
speaker line.
The recommended version of the T-Gen 50 for use in 4100U-S1 is available as part 4100-
0766K (see PID information in Chapter 1). This consists of a T-Gen 50 mounted on a
metal bracket which is mounted into the expansion bay in the same way as a legacy 4100
motherboard. This part code includes the necessary mounting hardware.
The best place to mount this bracket is in the right-most free slot in the expansion bay,
next to the mains socket bracket. The bracket should be installed with the T-Gen 50
faccing to the left - this is “upside down” compared to some other uses of this bracket.
Note also that the heat sink of the T-Gen 50 intrudes slightly into the space above the next
slot to the left. This will probably clash with other motherboards or modules and make
this slot unusable.
The T-Gen 50 must be continuously powered from 24VDC, i.e. not just during Alarm
conditions, so that it can supervise the 100V speaker line.
If the T-GEN 50 is powered from one of the outputs of the Fused Distribution Board
PA0915, the maximum speaker load is reduced to 20W. More load than this will run the
risk of blowing the 1A fuse on the Distribution Board. Do not fit a higher rated fuse to
the Distribution Board, since this will not provide proper protection due to other
protection devices in the power supply.
If more output is required, power the T-GEN 50 directly from the AUX POWER
terminals of the SPS power supply. This output is rated at 2A, which is just sufficient to
drive one fully loaded T-GEN 50. However, this leaves no reserve for any other
equipment to be powered from these terminals, e.g., a brigade signalling device.
Using T-Gen 50 with 4100U-S1
Overview
Powering the T-Gen 50