System Calibration - Renishaw VIONiC RTLC20-S Installation Manual

System calibration

NOTE: The functions described below can also be carried out using the optional ADTi-100 and ADT View
software. See www.renishaw.com/adt for more information.
Ensure signal strength has been optimised along the full axis of travel; the LED will be flashing Green.
Cycle the power to the readhead or connect the 'Remote CAL' output pin to 0 V for < 3 seconds. The readhead
will then single flash Blue to indicate it is in calibration mode as detailed in
on page 8. The readhead will only enter calibration mode if the LED is flashing Green.
Step 1 – Incremental signal calibration
X Move the readhead along the axis at slow speed (< 100 mm/s or less than the readhead maximum
speed, whichever is slowest), ensuring it does not pass a reference mark, until the LED starts
double‑flashing indicating the incremental signals are now calibrated and the new settings are stored in
the readhead memory.
X The system is now ready for reference mark phasing. For systems without a reference mark, cycle the
power to the readhead or connect the 'Remote CAL' output pin to 0 V for < 3 seconds to exit
calibration mode.
X If the system does not automatically enter the reference mark phasing stage (LED continues single
flashing) the calibration of 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 as detailed below, and check the readhead installation and system cleanliness before
repeating the calibration routine.
Step 2 – Reference mark phasing
X Move the readhead back and forth over the selected reference mark until the LED stops flashing and
remains solid Blue (or Green if AGC is disabled). The reference mark is now phased.
X The system automatically exits the calibration routine and is ready for operation.
X AGC is automatically switched on once calibration is complete. To switch off AGC refer to the
'Enabling/disabling AGC' section.
X If the 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 'RTLC20-S scale installation drawing' on page
Calibration routine manual exit
X To exit the calibration routine at any stage cycle the power to the readhead or connect the 'Remote CAL'
output pin to 0 V for < 3 seconds. The LED will then stop flashing.
LED
Blue single flashing None, restore factory defaults and recalibrate
Blue double flashing Incremental only
Blue (auto-complete) Incremental and reference mark
VIONiC RTLC20-S installation guide
'Readhead mounting and alignment'
4).
Settings stored
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:
X Switch system off.
Obscure the readhead optical window (using the spacer supplied with the readhead ensuring the cut-out
X
is NOT under the optical window) or connect the 'Remote CAL' output pin to 0 V.
X Power the readhead.
X Remove the spacer or, if using, the connection from the 'Remote CAL' output pin to 0 V.
X The LED will start continuously flashing indicating factory defaults have been restored and the readhead
is in installation mode (flashing set‑up LED).
X Repeat 'Readhead set-up' procedure on
Enabling/disabling AGC
The AGC is switched on once the system has been calibrated indicated by a Blue LED. AGC can be
manually switched off by connecting the 'Remote CAL' output pin to 0 V for > 3 seconds < 10 seconds.
The LED will then be solid Green.
page 8.
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