HEIDENHAIN ND 261 v.2 - Manual (Page 2)

The ND 261 is designed for use with HEIDENHAIN angle encoders with sinusoidal
output signals: either ND 261 A for 11 µA
PP
(Id. Nr. 283 482 ..) or ND 261 V for 1 V
PP
(Id. Nr. 322 352 ..). 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
restores 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°
suffices to restore the datum.
Switch-On
If you do not wish reference mark evaluation, press CL instead of ENT.
Switch on reference mark evaluation
• 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.
5 , 6 9 7
Turn on the power (switch located on rear panel).
• Display shows
.
• REF blinks.
Ent...CL
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.
0 ➤1
Select datum 1 or 2.
Enter a value, such as 40.
You can switch from one datum to the other at any time.
Use datum 2 when you want to display incremental dimensions.
4 0
Confirm entered value.