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SMRA - SSI and BiSS
7 - Diagnostic LED
One LED is installed in the side of the sensor and is designed to show visually
the operating or fault status of the device, as explained in the following table.
The operating or fault status of the device is also communicated through the
error bit, refer to the section “5.4 Error bit” on page 20 (SSI interface) or to the
section “Error (nE)” on page 24 (BiSS interface).
LED Description
OFF
The sensor is working properly, there are no active
errors.
ON lit red
Position calculation error, invalid position value; the
sensing electronics is not able to read the ring; this
problem may be caused, for instance, by an excessive
distance between the sensor and the ring, by a
wrong/reversed assembly of the elements, by a
damage to the magnetic surface of the ring; see the
section “3.3.2 Mounting the sensor“ on page 12.
The power supply is not as required, please refer to
the order code.
EEPROM error.
For further information refer also to the sections “8 - Error and fault
diagnostics” on page 34 and “10 - Troubleshooting” on page 36.
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