User manual

Chapter Two Installation
man_905-105_2.9 Page 15
2.3 Power Supply
The 905U/105S power supply is a switch-mode design which will accept either AC or DC supply. The
module may also be powered from a solar panel without an external solar regulator.
The module accepts supply voltages in the following ranges :
12 - 24 volts AC RMS or 15 - 30 volts DC at the “supply” terminals, or
10.8 -15 volts DC at the “battery” terminals.
The power supply should be rated at 1.5 Amps and be CSA Certified Class 2.
2.3.1 AC Supply
The AC supply is connected to the "SUP1" and "SUP2" terminals as shown below.
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The AC supply should be "floating" relative to earth.
2.3.2 DC Supply
For DC supplies, the positive lead is connected to "SUP1" and the negative to "GND". The positive
side of the supply must not be connected to earth. The DC supply may be a floating supply or
negatively grounded.
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The module may also be powered from an external 11 - 15 VDC battery supply without the need for a
"normal" supply connected to "SUP1". This external battery supply is connected to "BAT+" and
"GND" terminals. The positive lead of the external supply should be protected by a 2A fuse.
905U