Install peripheral devices Galaxy Flex Installer Manual
24
Peripheral power supply considerations
Data bus peripherals can be powered from the control panel via additional cores in the data
bus cables. If you choose this method, ensure there is sufficient spare power capacity in the
panel’s power supply, and consider the voltage drop along the cable.
The voltage at every peripheral must not be allowed to fall below 10V d.c. under maximum
load conditions, even when the system is running on the backup battery. However, a safer
working minimum is 12.5V d.c. If you have any concerns about maintaining voltage levels,
consider powering data bus peripherals from a separate power supply (see Figure 9).
Note: Do not connect power supplies in parallel. Do not connect +12 V terminals between
the control panel and remote power supplies. However, connect the 0 V (negatives)
of all power supplies at a common reference point.
Figure 9 Connecting a PSU to power peripherals
Camera PIR power supply considerations
Maintaining voltage is especially important for camera PIRs because of their significant
current draw (~260 mA) when night illumination is used during an alarm activation. You
can extend the usable distance by adding multiple cable cores together for the +12V and 0V
line pairs. The table below shows the maximum practical distances allowed between the
power supply and a Camera PIR (Cat 5 cable).
No. of pairs Cable length
1 100 m
2 200 m
3 300 m
If two camera PIRs are connected to a cable chain, reduce the maximum distances for the
+12V supply as indicated in Figure 10.
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