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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.
Before system calibration:
1. Ensure the scale and readhead optical window are clean (contamination around the
reference mark may result in reference mark dephasing).
2. If reinstalling, restore factory defaults (see
3. 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'
on page 49).
4. Ensure signal strength has been optimised around the full rotation of the ring; the readhead
LED will be green.
NOTE: CAL routine maximum speed: < 100 mm/s or less than the readhead maximum
speed, whichever is slowest.
Incremental signal calibration
1. Press and release 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.
Ti interface
48
TONiC™ FS RESM20 Functional Safety installation guide and safety manual
'Restoring factory defaults'
on page 49).
DOP interface
2. The CAL LED will now periodically single-flash to indicate that it is in incremental signal
calibration mode.
3. Move the readhead around the ring, ensuring you do not pass the 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.
4. The system is now ready for reference mark phasing.
5. For systems without a reference mark, go to
6. 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, exit the calibration routine, restore factory defaults
(see 'Restoring factory defaults'
on page 49) and check the readhead installation and
system cleanliness before repeating the calibration routine.
'Calibration routine – manual exit'
on page 49.
Original instructions
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