Renishaw ATOM Installation Manual page 39

Fault Cause
LED on the readhead appears
AGC is switched on and the signal
white with flashes of other level is < 70%
colours as the readhead is
moved along the axis
LED on the readhead is double The readhead is not seeing
flashing blue even after moving
a reference mark
it past the reference mark
several times
No reference mark output
Reference mark is not
repeatable
LED on the readhead is The reference mark is not phased
flashing red or blank over
the reference mark
Multiple reference marks output FPC is damaged
Possible solutions
• Check the readhead optical window and disc are clean and free from contamination.
• Restore factory defaults (page 36) then check the LED is green around the full axis of rotation and recalibrate the system
(page 34). If it is not green check the alignment of the readhead.
• Check the readhead orientation.
• Check the readhead alignment.
• Check the readhead optical window and disc are clean and free from contamination.
• Check that the readhead variant is the correct type for the chosen disc (see the ATOM
data sheet (Renishaw part no. L-9517-9563) for details of readhead configuration).
• Ensure you are not moving the readhead too fast during calibration mode (maximum speed < 100 mm / sec).
• Calibrate the system (page 34)
• If the system completes calibration mode, then it has successfully seen and calibrated the reference mark. If
you still cannot see a reference mark then check the system wiring.
• If the system does not calibrate the reference mark (LED on the readhead double flashes blue), see above for
possible solutions.
• Ensure the reference mark is calibrated (see page 35).
• The readhead bracket must be stable and not allow any mechanical movement of the readhead.
• Clean the disc and readhead optical window and check for damage then recalibrate the system (see page 34).
• Ensure the reference mark is calibrated (see page 35).
• Clean the disc and readhead optical window and check for scratches then recalibrate the system (see page 34).
• Replace damaged FPC (if applicable).
miniature encoder system
™
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