rechargeable battery voltage exceeds 3,5V . Only then can a GSM connection be established again and the
device resumes normal operation.
When an external supply or charging voltage (V IN) is used, the charge control ensures that the rechargeable
battery of the power supply unit is charged. The following operating states are possible:
l
Active energy saving mode (i.e. Device Logic inactive) or no Device Logic installed:
The charge control tries to charge the rechargeable battery to 3,8V or to maintain the voltage at this
level.
l
Device Logic active but the charge control was not configured via the "PM_SetChargingMode"
function:
The charge control is activated and the rechargeable battery is charged to the maximum voltage if the
state of charge of the rechargeable battery for the power supply unit falls below 50%. The charge
control is then deactivated again. This is designed to optimise the service life of the rechargeable
battery.
l
Device Logic active and the charge control was configured via the Device Logic:
The functionality of the charge control can be configured via the "PM_SetChargingMode" function.
There are three options available:
l
PM_CHARGING_OFF: Charge control deactivated
l
PM_CHARGING_NORMAL: The charge control is activated and the rechargeable battery is
charged to the maximum voltage if the state of charge of the rechargeable battery for the power
supply unit falls below 50%. The charge control is then deactivated again. This is designed to
optimise the service life of the rechargeable battery.
l
PM_CHARGING_SOLAR: The rechargeable battery of the power supply unit is charged to the
maximum voltage if the supply or charging voltage V IN exceeds 16V . The charge control then
remains deactivated for 12 hours unless the state of charge of the rechargeable battery for the
power supply unit drops below 95%. This charge strategy is recommended if a solar field is used
to charge the rechargeable battery.
The charge control reads out any additional information that is required, such as the maximum voltage and
ambient temperature at which charging is permitted, directly from the memory of the power supply unit. In
both charge strategies, recharging is only completed if the ambient temperature does not exceed the
permissible range of the charging temperature. The permissible charging temperature is specified in the
factsheet for the relevant power supply unit. Chapter "Power supply units" on page 264 contains an overview
of the temperature ranges of the power supply units.
7.6.10 Technical details about the energy supply
Schematic diagram of the energy supply
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