Enclosure Sealing
When fitting the enclosure cover, please ensure that both clips are snapped into place to
guarantee IP67 sealing.
Power requirements
The AT240 operates from a DC Voltage between 7 and 36 Volts. We recommend that a
permanent ‘live’ power source is used to supply the AT240. If current drain is of concern, please
refer to the power management section for options to minimise vehicle battery drain when
stationary for long periods.
Back-up Battery (option)
The AT240 operates from the external voltage source. If the optional back-up battery is fitted,
the AT240 will maintain optimum charge level and automatically switch to battery power should
the external voltage source fail or fall outside of the permitted range. Note that the operating
temperature range of the AT240 is reduced when the battery option is fitted (see Specifications
section). Please also note the handling precautions for lithium polymer batteries as outlined in
the AT240 Installation Guide.
Fuse Recommendations
Typical current drain is 25mA @ 13.8VDC and 14mA @ 27.6VDC, although maximum peak
current can be around 1.5A for very short periods. We recommend the use of 3A fuses in the
power feeds and ignition sense wires.
