TONiC RKLC20-S linear installation guide
11
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:
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Clean the scale and readhead optical window (contamination around the reference mark
may result in reference mark dephasing).
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If re-installing restore factory defaults.
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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.
NOTE: CAL routine maximum speed <100 mm/s (all Ti / TD interface models).
TD interface can be calibrated in either resolution.
Step 1 – Incremental signal calibration
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Press the CAL button on the end of the interface for < 2 seconds
using a 2 mm allen key or similar tool.
WARNING! Activating the CAL switch only requires 2.5 N force.
Applying excess force may permanently damage the switch.
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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. This indicates the incremental signal is now
calibrated and the new settings are stored in the
readhead memory.
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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 the incremental signals has failed. After ensuring failure is not due to overspeed
(>100 mm/s), exit the calibration routine, restore factory defaults and check the readhead installation and
system cleanliness before repeating the calibration routine.
Step 2 – Reference mark phasing
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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.
NOTE: Only the chosen reference mark that has been used in the calibration routine is guaranteed to
remain phased.
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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.
‑ 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
(see ‘RKLC20-S scale installation drawing’).
CAL LED
Settings stored
Single flashing
None, restore factory defaults and recalibrate
Double flashing
Incremental only
Off (auto-complete)
Incremental and reference mark
Restoring factory defaults
When re-installing the system or in the case of continued calibration failure,
factory defaults should be restored.
To restore factory defaults:
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Switch system off.
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Press and hold the CAL button whilst switching the system on. The CAL LED on the readhead will flash
several times, indicating that the factory defaults have been restored.
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Release CAL button.
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Check the ‘Readhead mounting / installation’ and recalibrate the system.
NOTE: System must be re-calibrated after restoring factory defaults.
Enabling /disabling AGC
AGC can be switched on or off via the interface.
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Press and hold the CAL button on the interface for >3 seconds to switch AGC on or off. The CAL LED on
the readhead will be illuminated when AGC is active.
NOTE: The system must be calibrated before switching AGC on.
Calibration routine manual exit
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To exit the calibration routine at any stage, press the CAL button. The CAL button will stop flashing.