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System calibration
Calibration is an essential operation that completes readhead set-up, with the optimum incremental and reference mark signal settings stored in the readhead's non-volatile memory.
Before system calibration:
Clean the scale and readhead optical window (contamination around the reference mark may result in reference mark dephasing).
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If reinstalling, restore factory defaults
('Restoring factory defaults', page
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Ensure Automatic Gain Control (AGC) is switched off (CAL LED on readhead is not illuminated)
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Maximise the signal strength along full axis of travel.
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NOTE: CAL routine maximum speed: < 100 mm/s or less than the readhead maximum speed, whichever is slowest (all Ti / TD interface models). TD interface can be calibrated in either resolution.
Step 1 – Incremental signal calibration
Press the CAL button on the end of the interface for < 2 seconds using a 2 mm allen key or similar tool.
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WARNING! Activating the CAL switch only requires 2.5 N force. Applying excess force may permanently damage the switch.
The CAL LED will now periodically single‑flash to indicate that it is in incremental signal calibration routine.
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Move the readhead along the axis, ensuring you do not pass the selected reference mark until the CAL LED starts double‑flashing.
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This indicates the incremental signal is now calibrated and the new settings are stored in the readhead memory.
The system is now ready for reference mark phasing.
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For systems without reference mark, go to 'Calibration routine - manual exit '
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If the system does not automatically enter the reference mark phasing stage (no double‑flashing of the CAL LED) the calibration of
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the incremental signals has failed. After ensuring failure is not due to overspeed (> 100 mm/s, or exceeding the readhead maximum speed),
exit the calibration routine, restore factory defaults
cleanliness before repeating the calibration routine.
Step 2 – Reference mark phasing
Move the readhead back and forth over the selected reference mark until the CAL LED stops flashing and remains off. The reference mark is now phased.
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NOTE: Only the chosen reference mark that has been used in the calibration routine is guaranteed to remain phased.
The system automatically exits the CAL routine and is ready for operation.
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If the CAL LED continues double‑flashing after repeatedly passing the chosen reference mark it is not being detected.
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‑ Ensure that the correct readhead configuration is being used. Readheads can either output all reference marks or only output a reference mark where a reference selector magnet is fitted
depending on the options chosen when ordering.
‑ Check reference mark selector magnet is fitted in the correct location relative to readhead orientation
Calibration routine manual exit
To exit the calibration routine at any stage, press the CAL button. The CAL button will stop flashing.
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CAL LED
Single flashing
None, restore factory defaults and recalibrate
Double flashing
Incremental only
Off (auto-complete)
Incremental and reference mark
TONiC RKLC20-S linear installation guide
15).
('Restoring factory defaults', page 15)
and check the readhead installation and system
Settings stored
('RKLC20-S scale installation drawing', page
5).
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