Adcon A725 addSDI, User Manual

Page: 11 / 43

CHAPTER 2
Maintaining and servicing the RTU
9
5.6 volts but over 5.2 volts)—this is called the misery state. In this
state, an addSDI RTU reduces its activities to a minimum. The
radio unit is switched off, the sensor sampling ceases, and no data
is stored in the internal memory. Only the internal real-time clock is
maintained and the power management functions are performed.
If the battery level drops below 5.2 volts, the system switches off
completely, effectively decoupling itself from the battery in order
to protect it. In this case the LED tool stays permanently off. An
addSDI RTU in such a situation will restart only after connecting it
to an external power supply (even a solar panel under low light
conditions).
Note: New addSDI RTUs are delivered with their internal batteries
unformatted, meaning they are completely discharged, and
you should install them only on sunny days. The battery will
be fully charged after two consecutive sunny days, but you
should get an LED light-up after several minutes of charging
in the sunlight.
Configuring an addSDI RTU in the addVANTAGE software
To configure the addSDI RTU with an A840 Telemetry Gateway
and the addVANTAGE Pro software, check the
Base Station,
Telemetry Gateway A840 and Wireless Modem A440 User Guide
.
Maintaining and servicing the RTU
The A725 unit needs virtually no maintenance. It is waterproof and
designed to withstand harsh environmental conditions (-30 to
+70 °C, or -22 to 158 °F), high RH values, water, and other noncor-
rosive liquids. It conforms to the European protection class IP65.
This applies also to the connectors, as long as they are mated.
Don’t let unmated connectors on either the addSDI RTU or the
sensors be exposed to the environment for extended periods of
time.
The RTU battery
The internal NiMH rechargeable battery pack supplies 6.2 volts.
The internal electronics manage the battery charging/discharging
process, ensuring it a long life. This approach, coupled with a
remarkably low average consumption, allows an addSDI RTU to