700 – Axiom - H1 Overview– Rev 7 - 03 Aug 2017
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1.2
Power connections
Power connections for the Axiom H1 Datalogger comprise the
SOLAR PANEL
input and the
BATTERY
input.
The
BATTERY
input is the power source for the Datalogger while the
SOLAR PANEL
input is used by the
internal power management system to charge the 12-volt battery.
Solar panel
1.2.1
The
SOLAR PANEL
input is colour coded on the Datalogger front panel with a black ring around the
connector. The connector is a three terminal, pin (male), bayonet, military style connector which can
accept a solar panel array up to a maximum of 100 Watts. The
SOLAR PANEL
input has an internal
blocking diode to prevent battery voltage from running back through the power management system
and discharging through the solar panel at night.
Normally solar panels are provided by FTS with the appropriate mating connector; however, if required,
details for the solar panel connection can be found in the Specifications section of this manual.
1.2.1.1
Solar charge operation
The
SOLAR PANEL
input provides power directly to the battery charge control circuits. This allows the
internal power management system to begin to charge the battery attached to the
BATTERY
input even
when there is not enough battery capacity to run the Datalogger (i.e. a completely discharged battery).
In addition, once the Datalogger is powered, battery charging is temperature compensated for optimal
battery charging.
Battery
1.2.2
The
BATTERY
connector is colour coded on the Datalogger front panel with a black ring around the
connector. The connector is a seven terminal, pin (male), bayonet, military style connector which is
designed to connect to a 12 V, absorbed glass mat, deep cycle battery. The cable connection to the
battery includes the main battery connection as well as voltage sensing leads and a temperature
sensing element. This set of connections enables the Datalogger’s power management system to
optimize battery charging as it is able to accurately measure the battery voltage and to temperature
compensate the battery charging algorithm.
Details of the battery connection can be found in the Specifications section of this manual.
1.3
Sensor inputs
The Axiom H1 Datalogger has two independent SDI-12
1
connection ports, as well as several internal
sensors. Some models have a dedicated rain sensor.
SDI ports
1.3.1
The Axiom H1 Datalogger has two fully independent front panel SDI-12 ports (SDI A and SDI B). The SDI
ports are special dedicated sensor connectors as the SDI-12 is a multi-drop interface (more than one
1
SDI-12 is a serial digital interface standard for microprocessor based sensors (for more information, see
http://www.sdi-12.org
.)
