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System calibration
NOTE: System calibration (CAL), can also be carried out using the optional ADTi-100 and ADT View software. See
Before system calibration:
Clean the scale and readhead optical window
If reinstalling, restore factory defaults
('Restoring factory defaults', page 24)
Maximise the signal strength along full length of travel (readhead set-up LED is flashing Green)
NOTE: Maximum calibration speed 100 mm/s or less than the readhead maximum speed, whichever is slowest.
Step 1 – Incremental signal calibration
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. The readhead will only enter calibration mode if the
LED is flashing Green.
Move the readhead at slow speed along the axis, 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.
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.
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, see
Step 2 – Reference mark phasing
Move the readhead back and forth over the chosen reference mark until the LED stops flashing and remains solid Blue. 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.
The system automatically exits the calibration routine and is ready for operation.
AGC is automatically switched on once calibration is complete. To switch off AGC refer to the
If the LED continues double-flashing after repeatedly passing the chosen reference mark it is not being detected.
- Ensure that the readhead orientation and lateral offset are correct.
Calibration routine manual exit
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
Incremental and reference mark
ATOM DX
linear installation guide
Settings stored
www.renishaw.com/adt
page 24
and check the readhead installation and system cleanliness before repeating the calibration routine.
'Switching Automatic Gain Control (AGC) on or off', page
for more information.
24.
23
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