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Electrical alignment
This method involves monitoring the output signals of two readheads mounted 180 degrees apart
and adjusting the disc to minimise the difference in count between the two heads.
NOTE: Due to spacing it is not possible to use this method on discs smaller than 22 mm diameter.
This requires:
A DSi interface
u
A digital counter
u
The clock frequency of the DSi, readheads and digital counter must be matched to ensure there is no
miscounting. For more information on choosing appropriate DSi and readheads for your system contact
your local Renishaw representative. For more information on the DSi refer to the TONiC DSi data sheet
(L-9517-9466).
1
Connect system as shown above.
2
Set the orientation switch on the reverse of the DSi to 'difference' mode.
Factory
setting
3
Power the system.
ATOM DX
rotary installation guide
INPUT 1
DSi
INPUT 2
Difference mode
or
4
Restore factory defaults on both ATOM DX readheads by obscuring the readhead windows whilst
switching the system on. This can be done individually or whilst the readheads are plugged into the DSi.
See page 12
for more information.
5
Using a custom designed bracket adjust both readheads to maximise the signal strength for
a complete rotation of the axis (readhead set-up LED should be flashing Green on both readheads)
6
Rotate the axis until the count displayed on the customer counter is at its minimum.
NOTE: If the count continues to increase then the orientation switch on the DSi is not in the
correct position.
7
Rotate the axis to the minimum count position and reset the counter to zero.
8
Rotate the axis until a maximum count is displayed. This should be ~180° from the position when
the count is minimum.
9
Gently move the disc relative to the hub in a radial direction at 90° to the readheads, as shown below,
until the count displayed on the customer counter is reduced by approximately half.
Customer
counter
Direction of
movement
10
Repeat steps 6 to 9 until the difference in (maximum count) – (minimum count) is within
the design specifications.
11
Cure the adhesive.
12
Recheck the run-out.
Contact your local Renishaw representative for more information on aligning the disc.
7
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