BilgMon488 Instruction Manual vAD 30(38)
BRANNSTROM SWEDEN AB
www.brannstrom.se
16 REAL TIME CLOCK (RTC)
The timekeeping mechanism in Bilgmon488 is referred to as the Real Time Clock (RTC). The RTC is
essentially a crystal oscillator backed up by at battery and a capacitor. The RTC keeps track of the
UTC time and date and is essential for keeping the log of Bilgemon488 correct.
16.1 LOCAL TIME
In the settings of each Bilgmon488 there is a possibility to adjust the displayed time. This affects how
time and date are displayed on the display (main menu, log items etc.). This setting is stored and
used as an offset to the internal time (RTC-time).
The internal UTC time and date can be checked in one of the cycles of the master info menu (see
10.8.1 Master info).
16.2 BATTERY REPLACEMENT
The RTC backup battery is coupled in parallel with a backup capacitor. This means that the
Bilgemon488 can keep its RTC running for a couple of hours without the battery present.
The RTC battery (type CR1225) is located on the backside of the master unit lid (see illustration).
Illustration 10: Master unit lid backside
Battery replacement procedure:
1. Disconnect the power supply.
2. Open the lid of the master unit (loosen 4 screws in the corners of the lid).
3. Push on the metal clip (holding the battery) and pull the battery out of the socket.
4. Replace with new battery of type CR1225 as soon as possible (within a couple of hours).
16.3 RTC MALFUNCTION
In the event of the RTC stopping the following message will appear:
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