
Fabius
®
Function Description
2-49
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10.3.10 LED Control
The LEDs (LED_MAN, LED_IPV, LED_SBY, LED_SIL, LED_WAR and LED_ALA) are
triggered by the transistors BCX17.
10.3.11 2-Min Silence Timer
The 2-min silence timer has a timer IC (74HC4060). The timer IC enables
suppression of the audible alarm for two minutes.
10.3.12 Buzzer and Buzzer Control
During operation, the buzzer is powered with 24 V. If a power failure occurs, the
built-in 9 V rechargeable battery on the Control PCB powers the buzzer. (Later
models have a Goldcap capacitor instead of a battery.) In the event of a failure, the
buzzer is triggered by the microcontroller.
10.3.13 Contrast Control
The operational amplifier TL072D generates the contrast voltage for the graphics
display. The contrast voltage is approximately –7 VDC to –8 VDC.
10.3.14 9V Rechargeable Battery or Goldcap Capacitor
In the event of a power failure, the 9 V rechargeable battery supplies the operating
voltage for the buzzer. The 24 V operating voltage supplies a charging circuit which
charges the rechargeable battery during normal operation.
Later models have a Goldcap capacitor instead of a battery.
Rev. A
Содержание Fabius 4116029
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