ABB BCU-02, Hardware Manual

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14 Hardware description
The 7-segment display
The following table gives the indications of the 7-segment display on the control unit. Multi-
character indications are displayed as repeated sequences of characters.
LEDs
The following table gives the indications of the LEDs on the control unit.
Miscellaneous
+ Battery Real-time clock battery
“U” is indicated shortly before “o”.
The control program has been launched and is running.
Flashing character.
The firmware cannot be started: The memory unit is missing or corrupted.
The firmware download from a PC to the control unit is in progress.
At the converter power-up, the 7-segment display can show short indications of, for example,
“1”, “2”, “b” or “U”. These are normal indications immediately after powering up the converter.
If the 7-segment display ends up showing other values than described above after the
power-up, it indicates a hardware failure.
LED
BATT OK When on, the battery voltage of the real time clock is sufficient (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 sufficient.
FAULT When on, the control program indicates that the equipment is faulty. See the applicable
firmware manual.
WRITE When on, writing to the SD card is in progress.
Description