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Troubleshooting (continued)
Fault
LED on the readhead appears white with
flashes of other colours as the readhead
is moved along the axis
LED on the readhead is double flashing
Blue even after moving it past the
reference mark several times
No reference mark output
Reference mark is not repeatable
LED on the readhead is flashing Red or
blank over the reference mark
Multiple reference marks output
ATOM linear installation guide
Cause
AGC is switched on and the signal level
is < 70%
The readhead is not seeing
a reference mark
Only the chosen reference mark that has
been used in the calibration sequence is
repeatable, other reference marks may
not be phased
The reference mark is not phased
Unused reference marks have not been
deselected or FPC is damaged
Possible solutions
Check the readhead optical window and scale are clean and free from contamination
Restore factory defaults
(page 29)
then check the LED is Green along the full axis and recalibrate the system
If it is not Green check the alignment of the readhead.
Ensure you are moving the readhead past your chosen reference mark several times
Check the scale / readhead orientation
Check the scale / readhead alignment
Check the readhead optical window and scale are clean and free from contamination
Check that the readhead variant is the correct type for the chosen scale
(see the ATOM
miniature encoder system data sheet (Renishaw part no. L-9517-9563) for details of readhead configuration).
™
Ensure you are not over-speeding the readhead during calibration mode (maximum speed < 100 mm / sec)
Calibrate the system
(page 28)
– 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 you are using the reference mark that has been calibrated for referencing your system
The readhead bracket must be stable and not allow any mechanical movement of the readhead
Check any unused reference marks have been deselected
Clean the scale and readhead optical window and check for damage then recalibrate the system over the chosen reference mark.
Ensure you are using the reference mark that has been calibrated for referencing your system as only this reference mark will
be guaranteed to remain phased
The LED may flash blank or Red when passing other reference marks if they have not been deselected
Clean the scale and readhead optical window and check for scratches then recalibrate the system over the chosen
reference mark
(page 28).
All unused reference marks should be deselected
Check alignment of deselection stickers
Replace damaged FPC (if applicable).
(page 13)
as only the calibrated reference mark will be repeatable
(page
28).
(page 13)
32
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