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The ND 221 is designed primarily for use with HEIDENHAIN MT Length Gauges.
MT gauges feature one reference mark. When the reference mark is crossed over,
it generates a signal identifying that position as a reference point.
After switch-on, simply crossing over the reference mark re-establishes the relation-
ship between axis positions and display values as it was last defined by datum
setting.
It is also possible to use other photoelectric linear encoders (see "Parameter Settings
for HEIDENHAIN Linear Encoders"). These encoders have one or more reference
marks, which may also be distance-coded . With distance-coded reference marks, a
maximum traverse of only 20 mm after switch-on suffices to re-establish the datum.
Switch-On
0
1
Ent...CL
5 , 6 9 7
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 221 allows you to set two separate datum points.
4 0
You can switch from one datum to the other at any time.
Use datum 2 when you want to display incremental dimensions.
Turn on the power (switch located on rear panel)
• Display shows
• REF blinks.
Switch on reference mark evaluation
• The display shows the value last assigned to the
reference mark position.
• REF indicator glows.
• Decimal point blinks.
Cross over reference mark
Move the axis until the display becomes active and the
decimal point no longer blinks.
Select datum 1 or 2.
Enter a value, such as 40.
Confirm entered value.
.
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