HEIDENHAIN ND 520 - Manual (Page 2)

The ND 520, ND 560 and NDP 560 are designed for use with HEIDENHAIN linear
encoders with sinusoidal output signals.
The linear encoders have one reference mark or several (preferably distance-coded)
reference marks. When a reference mark is crossed over, a signal is generated which
identifies that position as a reference point.
After switch-on, crossing over the reference marks restores the relationship between
axis slide positions and display values last established by datum setting. With
encoders which have distance-coded reference marks, this requires a traverse of no
more than 20 mm.
Switch-On
Turn on the power
➤ Switch on the display unit with the power switch on the rear panel.
The display shows and REF blinks.
Switch on reference mark evaluation
➤ Press ENT.
The display shows the value last assigned to the reference mark position.
REF glows and the decimal point blinks.
Cross over the reference mark in each axis
➤ Move the axes one after the other until the display becomes active and the
decimal point glows steadily.
The display unit is now ready for operation.
If you do not wish reference mark evaluation, press CL instead of ENT.
Datum Setting
The datum setting procedure assigns a specific axis
position to the associated display value.
You can set two separate datum points and switch
from one to the other with the touch of a key. Use
datum 2 when you want to display incremental
dimensions.
➤ Select the datum.
➤ Select the coordinate axis in which the tool
moves (for example, the X axis).
➤ Touch the workpiece with the tool.
➤ Enter the position of the tool center using the
numeric keypad (for example, X = –5 [mm]). A
minus sign cannot be entered until at least one
digit is in the display.
➤ Press ENT.
This stores the value for the tool position.
Follow same procedure for the other axes.
Y
X
Z
Touching the workpiece