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Siemens DRIVE-CLiQ dual head installation
Accuracy
The dual head interface is designed for use with two RESOLUTE
readheads and REXA30 ring only. It compensates for the effect of
bearing wander and eliminates all odd error harmonics including
eccentricity. However, 'even' error harmonics such as ovality
remain. This results in high angular accuracy to ±1 arc second, as
shown in the accompanying table.
For optimum accuracy performance, the readheads should be diametrically opposite each other so that the
optical centre lines are 180° apart. However if this is not possible due to mounting constrictions, or for partial
arc applications, the readheads should be mounted as close to this as possible; contact your local Renishaw
representative to find out what accuracy you can expect if this is the case.
Interface output
For readheads (RH1 and RH2) mounted such that the angle between them is θ.
RH1
1
θ / 2
Output
The dual head DRIVE-CLiQ interface takes simultaneous readings from both readheads and calculates
the mean of them. The output is therefore at an angle of θ
is orientated with increasing count as shown.
1
The readheads can be mounted in any orientation
46
RESOLUTE™ Functional Safety Installation guide and safety manual Siemens DRIVE-CLiQ encoder system
REXA30
Total installed accuracy
diameter
(with 2 readheads)
≥ 100 mm
±1 arc second
75 mm
±1.5 arc second
≤ 57 mm
± 2 arc second
Ring rotation to give
increasing count
θ
RH2
1
/
2 and is in the position shown when the scale
Summary of procedure
Install both readheads on mounting surfaces.
Connect both readheads to dual head interface and connect interface to controller.
Supply power to the controller and interface, adjust each readhead such that both
readheads have good signal levels around the ring (green or blue indication).
Acknowledge any errors on the controller that may have occurred during installation.
Original instructions
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