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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 over the full axis of rotation; 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
and alignment', page
10. The readhead will only enter calibration mode if the LED is flashing Green.
Step 1 – Incremental signal calibration
X
Rotate the axis at slow speed (< 100 mm/s or less than the readhead maximum speed, whichever is
slowest), ensuring the readhead does not pass a reference mark, until the LED starts double‑flashing.
This indicates that 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 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 and AOC are automatically switched on once calibration is complete. To switch off AGC refer to
'Enabling/disabling AGC', page
12.
X
If the LED continues double‑flashing after repeatedly passing the reference mark it is not being detected.
Ensure correct readhead alignment.
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 REXM20/REXT20 installation guide
'Readhead mounting
Settings stored
11
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