4. Connect power to the controller
The power supply comes pre-installed in the cabinet. It can power the electrical hardware and
charge up to two 7 Ah 12 V batteries. It provides a battery charging current of 3.5 A.
The power supply provides two alarm outputs for monitoring battery low voltage and mains
failure alarms. Both the alarm outputs have on-board 4k7 EOL resistors fitted as standard.
Note: Do not apply voltage directly to the Battery Low or Mains Failure outputs, as this will
damage the monitoring circuitry, rendering the power supply unusable.
1. Connect the earth wire from the power supply to the cabinet door.
2. Using the battery lead provided, connect one or two 7 Ah 12 V batteries to the power
supply. The batteries must be connected in parallel. The red wire connects to the red/
positive battery terminal. The black wire connects to the black/negative battery terminal.
The batteries are not provided. The batteries are used as standby batteries, should the
mains power supply fail.
3. Connect an IEC power lead from the mains wall socket to the power supply unit. The IEC
power lead is not provided with the kit.
4. Ensure all equipment operates correctly, both with mains power ON/batteries ON, and
with mains power OFF/batteries ON.
Calculating battery life
The cabinet supports up to two 7 Ah 12 V batteries. To know how long your batteries will
support your cabinet, calculate the following:
(combined battery capacity*) ÷ (total current draw in amps**) = (battery life in hours)
*To find the combined battery capacity, add the Ah values of all your batteries.
**To find the total current draw, add the current draw of the individual units in your cabinet.
Refer to the end of this installation note and separate hardware installation notes for current
draw values.
Battery Low alarm
The Battery Low system alarm will be triggered when the battery charge falls below 10.8 V.
If no battery is connected the Battery Low alarm will not activate. This output is connected to
Input 15 in the default configuration.
