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Functional description
Two independent control loops are mounted on the mother board.
First control loop:
It supplies the central unit and the connected readers.
- protected with 2.0 AF (including external consumers)
-
Second control loop:
It is used to charge the batterys. The charging current is limited to 120 mA.
The battery charging current is monitored and tracked depending on the temperature by means of an
NTC resistor.
The end-of-charging voltage of the battery charging unit is correctly set in the factory for
Sonnenschein batterys of the A500 series.
If it is necessary to change the setting, proceed as described in the chapter "Adjusting the end-of-
charging
voltage".
-
Not stabilized powersupply U
A not stabilized direct current voltage is available for external consumers.
The suppy voltage for the central unit and the external consumers need not be adjusted.
Switching the power supply off:
If, during battery operation, the battery voltage falls below 9.5V, the power supply to the central unit and the
external consumers is switched off (cutoff relay).
Thus, unpredictable reactions in case of undervoltage are avoided and the battery is protected against total
discharge.
Faults:
The messages are issued via the outputs
Fault (ST1/3), HIGH active
The following fault causes are possible:
Power / ext. consumers / charging controller defective /
Battery defective or missing
Power supply (ST1/6), output , HIGH active.
This output is active when the power is on.
ext
Installation instructions / ACS-2 plus
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