Renishaw TONiC T20x1 REXM20 Installation Manual page 31

Readhead orientation
IMPORTANT: Select the correct head orientation switch position.
This switch can be found on the rear of the DSi. The DSi must be recalibrated if the switch
position is changed.
Encoder forward
rotation direction
Option 1: recommended
Output
count
INPUT 1
direction
Factory
default
INPUT 2
propoZ
position
Option 2: alternative
Output
count
INPUT 1 direction
Factory
default
INPUT 2
propoZ
position
Factory
setting
FWD - - REV
A - - B
- FWD REV -
- A B -
Calibration
Calibration is an essential operation that completes system set-up. The system must be
recalibrated if the installation is disturbed or if the DSi has been moved to a different axis.
Using a small hex-key (or other suitable implement) press
and hold the recessed propoZ button on the front of the DSi
as the power is switched on. The LED on the DSi will go red,
release the button and the LED will go orange, then start to
flash green. The initialisation status, 'K', will be 'low'.
For complete rotation:
1. Rotate the axis in one direction until the LED on the DSi stops flashing (the initialisation
status, 'K', will go 'high').
NOTE: The axis may need up to two full rotations to achieve this.
2. The DSi has now memorised the number of counts per revolution and determined the factory
default propoZ position.
For partial rotation:
1. Ensure the ring is installed so the reference marks are positioned correctly
(see 'Mounting the REXT (partial rotation)'
2. Rotate the axis in both directions to its maximum travel until the LED on the DSi stops
flashing (the initialisation status, 'K', will go 'high').
3. The factory default propoZ position has now been determined.
NOTE: For optimum system accuracy and performance at higher speeds, ensure that the AGC is
switched off (see 'Switching Automatic Gain Control (AGC) on or off'
on page 18).
on page 28).
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