Honeywell ACS-8 Installation Instructions Manual page 73

Installation Instructions / ACS-8
Functional description
Two independent supplies are mounted on the mother board.
- First output:
This supplies the central unit and the external circuits.
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- Second output:
This is used to charge the batteries. The charging current is limited to 1.5A.
The battery charging current is monitored and its temperature tracked using an NTC resistor.
The fully charged voltage of the battery charging unit is factory set for Sonnenschein A500 series
batteries.
If it is necessary to change the setting, proceed as described in the chapter "Setting the fully
charged voltage".
The supply voltage for the central unit and the external consumers must not be adjusted. These are tied
to the battery charging current in order to avoid the large fluctuations that are liable to occur in the event
of power failure.
Overvoltage protection:
The power supply unit is equipped with overvoltage protection. This is activated if the output voltage or the
battery charging voltage exceeds 17V DC in case of a fault
Low voltage cut-off:
If, during battery operation, the battery voltage falls below 10.5V, the power supply to the central unit and
the external consumers is switched off (cutoff relay).
This prevents unexpected operation due to undervoltage and the battery is protected from deep discharge.
The "!U<" warning signal is activated before the power supply is turned off (see description below).
Common faults:
The messages are issued via the outputs
- "Fault" (ST1/3), HIGH active and
-"Fault" (ST1/2), LOW active.
The following causes of faults are possible:
Power/ext. consumers/charging controller defective/
battery defective or missing/SE input
The type of fault is shown by the state of the LEDs located on the power supply board.
Central unit supply output, protected with 2.5A fuse (incl. external circuits)
External circuits output, protected with 2x1A fuses
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