Renishaw ATOM Installation Manual page 22

Troubleshooting
(continued)
Fault
LED on the readhead appears Purple
LED on the readhead appears white with
flashes of other colours as the readhead is
moved around the disc
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
rotary installation guide
Cause
This is Blue and Red combined
AGC is switched on and
signal level is <50%
AGC is switched on and
the signal level is <70%
The readhead is not seeing a
reference mark
The reference mark is not phased
FPC is damaged
Possible solutions
u Check the readhead optical window and disc are clean and free from contamination
u Restore factory defaults (see page 17) then check the LED is Green around the full axis of rotation and recalibrate
the system (see page 17). If it is not Green check the alignment of the readhead
u
Check the readhead optical window and disc are clean and free from contamination
u
Restore factory defaults (see page 17) then check the LED is Green around the full axis of rotation and recalibrate
the system (see page 17). If it is not Green check the alignment of the readhead
Check the readhead orientation
u
Check the readhead alignment
u
Check the readhead optical window and disc are clean and free from contamination
u
u Check that the readhead variant is the correct type for the chosen scale
(see the ATOM data sheet (L-9517- 9563) for details of readhead configuration)
Ensure you are not over-speeding the readhead during calibration mode (maximum speed <100 mm/sec)
u
Calibrate the system (see page 17)
u
– If the system completes calibration mode then it has successfully seen and calibrated the reference mark
If you still don't see a reference mark then check the system wiring
– If the system does not calibrate the reference mark (readhead set-up LED double flashes Blue)
see above for possible solutions
Ensure the reference mark has been calibrated (see page 17)
u
The readhead bracket must be stable and not allow any mechanical movement of the readhead
u
u Clean the disc and readhead optical window and check for scratches then recalibrate the system
Ensure that the reference mark has been calibrated (see page 17)
u
Clean the disc and readhead optical window and check for scratches then recalibrate the system (see page 17)
u
Replace damaged FPC (if applicable)
u
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