System Calibration - Renishaw T101 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:
Clean the scale and readhead optical window (contamination around the reference mark
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may result in reference mark dephasing).
If re-installing restore factory defaults.
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Maximise the signal strength along full axis of travel.
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NOTE: CAL routine maximum speed <100 mm/s (all Ti/TD interface models).
TD interface can be calibrated in either resolution.
Step 1 – Incremental signal calibration
Ensure Automatic Gain Control is switched off
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(CAL LED on readhead is not illuminated) before beginning calibration.
Press and release the CAL button on the end of the interface using
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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.
The CAL LED will now periodically single-flash to indicate that
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it is in incremental signal calibration mode.
Move the readhead along the axis, ensuring you do not pass
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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.
The system is now ready for reference mark phasing.
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For systems without reference mark, go to 'Calibration routine - manual exit'
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If the system does not automatically enter the reference mark phasing stage (no double-flashing of the
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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.
Step 2 – Reference mark phasing
Move the readhead back and forth over the selected reference mark until the CAL LED stops flashing
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and remains off. The reference mark is now phased.
The system automatically exits the CAL routine and is ready for operation.
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If the CAL LED continues double-flashing after passing the chosen reference mark many times,
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it is not detecting the reference mark. 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.
Calibration routine – manual exit
To exit the calibration routine at any stage press the CAL button. The CAL button will then stop flashing.
u
CAL LED
Single flashing None, restore factory defaults and re-calibrate
Double flashing Incremental only
Incremental and reference mark
Off (auto-complete)
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;
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Switch system off.
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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.
TONiC RSLM/RELM installation guide
Settings stored
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 (AGC) on or off
AGC can be switched on or off via the interface.
Press and hold the CAL button on the interface for >3 seconds to switch AGC on or off. The CAL LED on
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the readhead will be illuminated when AGC is active.
NOTE: The system must be calibrated before switching AGC on.
T101 readhead LED diagnostics
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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
Incremental
Purple Normal setup; signal level 110% to 135%
Blue Optimum setup; signal level 90% to 110%
Green Normal set-up: signal level 70% to 90%
Orange Acceptable set-up; signal level 50% to 70%
Poor set-up; signal may be too low for reliable operation;
Red
signal level <50%
Red / blank - flashing Poor set-up; signal level <20%; system in error
Over speed; system in error
Blue / blank - flashing
Purple / blank - flashing Over signal; system in error
Reference mark Blank flash Reference mark detected (speed <100 mm/s only)
* 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%
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; clean scale and recalibrate if required
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
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