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System calibration
Calibration (CAL) 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:
•
Clean the scale and readhead optical window
•
If reinstalling, restore factory defaults (see
•
Ensure AGC is switched off (readhead set-up LED is green, red or orange)
•
Maximise the signal strength along full length of travel (readhead set-up LED is green)
NOTE: Maximum calibration speed 100 mm/s or less than the readhead maximum speed,
whichever is slowest.
'Restoring factory defaults'
on page 47)
Step 1 – Incremental signal calibration
•
Initiate calibration routine.
No interface
ACi interface
Ground the CAL pin
Connect the CAL
for < 2 seconds.
pads together or
ground the remote
CAL line (pin 8) for
< 2 seconds.
Two
CAL
pads
•
The readhead set-up LED will now periodically single-flash blue to indicate that it is in the incremental
signal calibration routine. The set-up signal (V
•
Slowly move the readhead along the axis, ensuring you do not pass a reference mark, until the
readhead set-up LED starts double-flashing blue. This indicates the incremental signal is now
calibrated and the new settings are stored in the readhead memory. The set-up signal (V
nominal 1.65 V.
•
The system is now ready for reference mark phasing.
•
For systems without a reference mark, go to
•
If the system does not automatically enter the reference mark phasing stage (no double-flashing
blue of the readhead set-up LED) the calibration of the incremental signals has failed. After ensuring
failure is not due to overspeed (> 100 mm/s), exit the calibration routine, restore factory defaults and
check the readhead installation and system cleanliness before repeating the calibration routine.
Ri interface
Ti interface
Press the CAL button
Press the CAL button on
on the side of the
the end of the interface
interface for < 2 seconds
for < 2 seconds using
using a 2 mm
a 2 mm Allen key or
Allen key or similar tool.
similar tool.
CAL
button
WARNING: Activating the CAL switch only requires
2.5 N force. Applying excess force may permanently
damage the switch.
) will be a nominal 0 V.
X
'Calibration routine – manual exit'
on page 46.
www.renishaw.com
) will be a
X
45
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