Setting The Datum - HEIDENHAIN ND 261 Manual

The ND 261 is designed for use with HEIDENHAIN angle encoders with sinusoidal
output signals. These angle encoders have one reference mark or several
distance-
coded
reference marks.
When a reference mark is crossed over, it generates a signal identifying that position
as a reference point. After switch-on, simply crossing over a reference mark re-
stores the relationship between axis positions and display values as it was last
defined by datum setting.
With distance-coded reference marks, a maximum traverse of only 10" or 20" suf-
fices to restore the datum.
Switch-On
Turn on the power (switch located on rear panel).
l
Display shows -1
l
REF blinks.
~ me...CL
Switch on reference mark evaluation
l
Display shows the value last assigned to the
reference mark position.
l
REF indicator glows.
5,697
l
Decimal point-blinks.
-
1
Cross over reference mark
\I
Move the axis until the display becomes active and the
decimal point no longer blinks.
If you do
not
wish reference mark evaluation, press CL instead of ENT.
Setting the Datum
The datum setting procedure assigns a display value to a specific axis position
The ND 261 allows you to set two separate datum points.
Select datum 1 or 2.
pm1
Enter a value, such as 40,
I
40
-
J
Confirm entered value,
You can switch from one datum to the other at any time.
Use datum 2 when you want to display incremental dimensions.