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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.
Calibration must be carried out for both of the TONiC readheads before connecting them to
the DSi.
Before system calibration:
•
Ensure the ring and readhead optical window are clean.
•
If reinstalling, restore factory defaults (see
•
Ensure Automatic Gain Control is switched off (CAL LED on readhead is not illuminated)
before beginning calibration (see
'Switching Automatic Gain Control (AGC) on or off'
page 28).
•
Ensure the signal strength has been optimised over the full axis of rotation; the readhead
LED will be green.
Incremental signal calibration
1. Press and release the CAL button on the end
of the interface 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.
2. The CAL LED will now periodically single-flash to indicate that it is in incremental signal
calibration mode.
3. 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 CAL
LED starts double-flashing. This indicates that the incremental signals are now calibrated and
the new settings are stored in the readhead memory.
'Restoring factory defaults'
on page 28).
on
4. The system is now ready for reference mark phasing.
5. 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.
•
Ensure the failure is not due to overspeed (> 100 mm/s or exceeding the readhead
maximum speed)
•
Exit the calibration routine and restore factory defaults (see
on page 28).
•
Check the readhead installation and system cleanliness and repeat the
calibration routine.
Reference mark phasing
1. Rotate the axis back and forth ensuring the reference mark passes the readhead until the
CAL LED stops flashing and remains off. The reference mark is now phased.
2. The system automatically exits the CAL routine and is ready for operation.
3. If the CAL LED continues double-flashing after passing the chosen reference mark many
times, it is not detecting the reference mark.
•
Ensure that the correct readhead configuration is being used (T20x1).
Calibration routine manual exit
To exit the calibration routine at any stage press the CAL button. The CAL button will
stop flashing.
LED status during system calibration
CAL LED
Single flashing
Double flashing
Off (auto-complete)
'Restoring factory defaults'
Settings stored
None, restore factory defaults and recalibrate
Incremental only
Incremental and reference mark
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