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72 Fault tracing
Control unit LEDs
￭
LED
Color
BATT OK
Green
PWR OK
Green
FAULT
Red
WRITE
Yellow
R8i module LEDs
￭
LED
Color
FAULT
Continuous red
ENABLE / STO
Continuous green
ENABLE / STO
Continuous yellow
POWER OK
Continuous green
7-segment display of the brake control unit
See the control unit description.
Warning and fault messages
See ACS880 brake unit control program firmware manual [3AXD50000020967 (English)].
Indication
Battery voltage of the real-time clock is OK (higher than 2.8 V).
When the LED is not lit,
• battery voltage is below 2.8 V,
• the battery is missing, or
• the control unit is not powered.
Internal voltage is sufficient.
The control program indicates that the equipment is faulty.
See the appropriate firmware manual.
Writing to SD card in progress.
Indication
There is an active fault in the module.
The module is ready for use.
XSTO connectors are de-energized.
Supply voltage of the internal circuit boards is OK (> 21 V).
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