System Calibration - Renishaw QUANTiC RTLC40-S Installation Manual

System calibration

NOTE: The functions described below can also be carried out by using the optional ADTi-100
and ADT View software. See www.renishaw.com/adt
Before system calibration:
1. Clean the scale and readhead optical window.
2. If reinstalling, restore the factory defaults (see
3. Maximise the signal strength along the full length of travel (set-up LED is flashing green).
NOTE: During calibration the speed should not exceed 100 mm/s or the readheads'
maximum speed, whichever is slowest.
Incremental signal calibration
1. Cycle the power to the readhead or connect the 'Remote CAL' output pin to 0 V for
< 3 seconds. The readhead will then periodically single-flash blue to indicate it is in calibration
mode as detailed in 'Readhead mounting and alignment'
only enter calibration mode if the LED is flashing green.
2. 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.
3. 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.
4. 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
page 21) and check the readhead installation and system cleanliness before repeating the
calibration routine.
NOTE: For analogue variants of QUANTiC ensure the correct termination of output signals
(see 'Recommended signal termination'
20 QUANTiC RKLC40-S incremental linear encoder system
™
for more information.
'Restoring factory defaults' on page 21).
on page 19. The readhead will
'Restoring factory defaults' on
on page 30).
Reference mark phasing
1. Move the readhead back and forth over the selected 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.
2. The system automatically exits the calibration routine and is ready for operation.
3. AGC and AOC are automatically switched on once calibration is complete. To switch off AGC
refer to 'Switching Automatic Gain Control (AGC) on or off'
4. If the LED continues double-flashing after repeatedly passing the chosen reference mark it is
not being detected.
• Ensure that the correct readhead configuration is being used. Readheads can either
output all reference marks or only output a reference mark where a reference selector
magnet is fitted depending on the options chosen when ordering.
• Check that the reference mark selector magnet is fitted in the correct location relative to
readhead orientation (see 'RTLC40-S scale installation drawing'
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 stop flashing.
LED status during system calibration
LED
Blue single-flashing
Blue double-flashing
Blue (auto-complete)
on page 21.
on page 12).
Settings stored
None, restore factory defaults and recalibrate
Incremental only
Incremental and reference mark