System Calibration; Restoring Factory Defaults - Renishaw TONiC T20 1 Series Installation Manual

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, install the readhead to maximise the signal strength along the full axis travel.
NOTE: CAL routine maximum speed <100 mm/s (all Ti/TD interface models)
Step 1 – Incremental signal calibration
u Ensure Automatic Gain Control is switched off
(CAL LED on readhead is not illuminated)
before beginning calibration.
u Press and release the CAL button on the end of the
interface using a 2 mm allen key or similar tool.
u The CAL LED will now periodically single-flash
to indicate that it is in incremental signal
calibration routine.
u Move the readhead along the axis, ensuring you do
not pass the selected reference mark, until the
CAL LED starts double-flashing, indicating the
incremental signal is now calibrated and the
new settings are stored in the readhead memory.
u The system is now ready for reference mark phasing.
For systems without reference mark, go to 'Calibration routine - manual exit'
Step 2 – Reference mark phasing
u Move the readhead back and forth over the selected reference mark until the CAL LED stops
flashing and remains off. The reference mark is now phased.
u The system automatically exits the CAL routine and is ready for operation.
Calibration routine - manual exit
u To exit the calibration routine at any stage press the CAL button.
u 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 (>100 mm/s), exit the calibration routine, restore factory defaults and check the
readhead installation and system cleanliness before repeating the calibration routine.
u If the reference mark is not being used, exit the calibration routine after step 1 is completed.
u If the readhead continues double flashing after passing the chosen reference mark many times,
it is not detecting the reference mark. Ensure that the correct head is being used.
Heads can either output all reference marks or only output a reference mark where a reference
selector magnet is fitted.

Restoring factory defaults

When re-installing the system, or in the case of continued calibration failure, factory defaults
should be restored.
To restore factory defaults;
u
Switch system off.
u
Press and hold the CAL button whilst switching the system on. The CAL LED on the readhead
will flash several times, indicating that the factory defaults have been restored.
u
Release CAL button.
u
Check the 'Readhead mounting/installation' and re-calibrate the system.
NOTE: System must be re-calibrated after restoring factory defaults.
Switching Automatic Gain Control on or off
AGC can be switched on or off via the interface.
u Press and hold the CAL button on the interface for >3 seconds to switch AGC on or off.
The CAL LED on the readhead will be illuminated when AGC is active.
NOTE: The system must be calibrated before switching AGC.
T20x1 readhead LED diagnostics
LED Indication
Set-up
Green
Orange
Incremental
Red
*
Green (flash)
Reference mark Orange (flash)
Red (flash)
CAL On
Operating
Off
Single flashing
Calibration
Double flashing
Flashing at
Reset
power-up (<2s)
* Flash will effectively be invisible when incremental signal level is
Ti0004 to Ti20KD and TD4000 to TD0040 interface LED diagnostics
Signal Indication
Purple Normal setup; signal level 110% to 135%
Blue Optimum setup; signal level 90% top 110%
Green Normal set-up: signal level 70% to 90%
Incremental
Orange Acceptable set-up; signal level 50% to 70%
Poor set-up; signal may be too low for reliable operation;
Red
signal level <50%
Purple / blank - flashing Over signal; system in error
Blue / blank - flashing Over speed; system in error
Red / blank - flashing Poor set-up; signal level <20%; system in error
Reference mark detected (speed <100mm/s only)
Reference mark Blank flash
* -Alarm output will take the form of 3-state or line driven E signal depending on interface configuration.
Also, some configurations do not output overspeed alarm. See product nomenclature for details.
-Momentary status only, while fault condition remains.
-Alarm may result in axis position error, re-datum to continue.
Status
Normal set-up: signal level 70% to 135%
Acceptable set-up; signal level 50% to 70%
Poor set-up; signal may be too low for reliable operation; signal level <50%
Normal phasing
Acceptable phasing
Poor phasing; recalibrate
Automatic Gain Control – On
Automatic Gain Control – Off
Calibrating incremental signals
Calibrating reference mark
Restore factory defaults
>70% when passing reference mark.
Status Alarm output*
No
No
No
No
No
Yes
Yes
Yes
No