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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
('Restoring factory defaults', page 29)
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.
Step 1 – Incremental signal calibration
Initiate calibration routine.
No interface
ACi interface
Ground the CAL pin
Connect the CAL pads
for < 2 seconds
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
The system is now ready for reference mark phasing.
For systems without reference mark, go to 'Calibration routine - manual exit'.
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.
ATOM linear installation guide
Ri interface
Ti interface
Press the CAL button
Press the CAL button
on the side of the
on the end of the
interface for
interface for
< 2 seconds
< 2 seconds
CAL
using a
using a
button
2 mm
2 mm
allen key or
allen key or
similar tool.
similar tool.
WARNING: Activating the CAL
WARNING: Activating the CAL
switch only requires 2.5 N force.
switch only requires 2.5 N force.
Applying excess force may
Applying excess force may
permanently damage the switch.
permanently damage the switch.
) will be a nominal 0 V.
X
) will be a nominal 1.65 V.
X
Step 2 – Reference mark phasing
Slowly move the readhead back and forth over the chosen reference mark until the readhead set-up
LED stops flashing and remains Green. The reference mark is now phased. The set-up signal (V
be a nominal 3.3 V depending upon system set-up
NOTE: Only the chosen reference mark that has been used in the calibration routine is guaranteed
to remain phased.
The system automatically exits the CAL routine and is ready for operation.
If the readhead set-up LED continues double-flashing Blue after passing the chosen reference mark
many times, it is not detecting the reference mark. Ensure that the readhead orientation and lateral
offset are correct.
Calibration routine – manual exit
The calibration routine can be exited at any stage. Depending upon the interface used follow the relevant
section in the table below to exit CAL mode.
No interface
ACi interface
Ground the CAL pin for
Connect the CAL pads
< 2 seconds.
together or ground the
remote CAL line (pin 8) for
< 2 seconds.
On successful exit the readhead set-up LED will stop flashing Blue and remain Green or Red.
('Output specifications', page
46).
Ri interface
Ti interface
Press and hold the CAL
Press the CAL button on
button on the side of the
the end of the interface for
interface for < 2 seconds.
< 2 seconds.
) will
X
28
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