HEIDENHAIN ND 287 User Manual - Manual (Page 81)

ND 287
81
II – 2 Installation Set
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Non-linear error compensation
Non-linear error compensation should be applied if the results of the
comparison with a reference standard show an alternating or
oscillating deviation. The ND 287 supports up to 200 correction
points per axis
. The error value between two entered adjacent
correction points is calculated with linear interpolation. The required
correction values must be calculated and entered in an error
compensation table.
For rotary encoders, 180 correction points spaced every 2° are
predefined by the ND 287.
Selecting non-linear error compensation
 In the INSTALLATION SETUP menu, select ERROR
COMPENSATION.

If you have configured the ND for two axes in the APPLICATION
field under COUNTER SETTINGS, you can define error
compensation for the two possible encoder inputs, labelled INPUT
X1 and X2.

Select the input you want to define.
 Press the ERROR COMP. soft key to select NON-LINEAR.
 Non-linear error compensation is available for encoders
with reference marks
, for absolute encoders and for
analog sensors.
 If non-linear error compensation has been defined, no
error compensation will be applied until the reference
marks have been crossed
.
Fig. II.32 Non-linear error compensation form