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14 BCU-01/11 control units
Fault tracing
LEDs
LED
BATT OK
When on, the battery voltage of the real time clock is OK (higher than 2.8 V).
When off,
• battery voltage is below 2.8 V,
• battery is missing, or
• control unit is not powered.
PWR OK
When on, internal voltage is OK.
FAULT
When on, the control program indicates that the equipment is faulty. See the
appropriate firmware manual.
WRITE
When on, writing to the SD card is in progress.
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