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Troubleshooting
(continued)
Fault
During calibration the 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
over the reference mark
Multiple reference marks output
ATOM DX
linear installation guide
Cause
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
Possible solutions
Ensure you are moving the readhead past your chosen reference mark several times
u
Check the scale/readhead orientation
u
Check the scale readhead alignment
u
Check the readhead optical window and scale are clean and free from contamination
u
Check that the readhead variant is the correct type for the chosen scale
u
(see the ATOM DX data sheet (L-9517- 9736) 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 remains double flashing Blue)
see above for possible solutions
Ensure you are using the reference mark that has been calibrated for referencing your system
u
The readhead bracket must be stable and not allow any mechanical movement of the readhead
u
Check any unused reference marks have been deselected
u
Clean the scale and readhead optical window and check for damage then recalibrate the system over
u
the chosen reference mark
Ensure you are using the reference mark that has been calibrated for referencing your system as only this
u
reference mark will be guaranteed to remain phased.
The LED may flash Red when passing other reference marks if they have not been deselected
u
Clean the scale and readhead optical window and check for scratches then recalibrate the system over the
chosen reference mark
(see page 17)
All unused reference marks should be deselected
u
Check alignment of deselection stickers
u
(see page 8)
as only the calibrated reference mark will be repeatable
(see page 8)
19
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