Renishaw QUANTiC RTLC40-S Installation Manual page 23

Fault
During calibration the LED on the
readhead remains single-flashing
blue even after moving it along the
full axis length
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
Cause
The system has failed to calibrate the
incremental signals due to the signal
strength being < 70%
Incorrect termination
(analogue variant only)
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
• Exit CAL mode and restore factory defaults (see page 21)
• Check the readhead set-up and alignment (see page 19)
• Check the output signal termination (see page 30)
• When using the readhead with the ADTi-100 in stand-alone mode ensure the Termination tool (A-6195-2132)
is connected
• Exit CAL mode and restore factory defaults (see page 21)
• Check the readhead set-up and alignment (see page 19)
• Ensure correct position of the reference mark selector magnet
• Ensure you are moving the readhead past your chosen reference mark several times
• Check the readhead /selector magnet orientation
• Check the readhead optical window and scale are clean and free from contamination
• Ensure you are not moving the readhead too fast during calibration mode (maximum speed < 100 mm/sec)
• Calibrate the system (see page 20)
• If the system completes the calibration mode, it has successfully seen and calibrated the reference mark.
If you still do not see a reference mark, check the system wiring.
• If the system does not calibrate the reference mark (LED on the readhead remains double-flashing 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
• Clean the scale and readhead optical window and check for damage then recalibrate the system over the
chosen reference mark (see page 20)
Possible solutions
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