HEIDENHAIN ND 520 User Manual
HEIDENHAIN
Working with the position display units
ND 520 ND 560 NDP 560
For two axes For three axes For panel mounting
Actual value and input display
(7-segment LED, 8 decades with
sign); top to bottom: X axis,
Y axis, ND 560 / NDP 560 only:
Z axis
• Select coordinate axis
(Z axis only with ND 560 and NDP 560)
• Select axis-specific operating parameters
Numeric keypad
and decimal point
1
REF
HEIDENHAIN
Status indicators
2
in. SCL
• Select datum
• Page backward in
parameter list
X
7
4
Y
1
Z
1
0
2
SPEC
CL
FCT
• Clear entry
• CL plus two-digit number:
select parameter
• Clear parameter entry
MOD
9
8
5
6
3
2
ENT
• Sign
• Change parameter
Confirm entry
• Call operating
parameters
• Page forward in
parameter list
Datum setting
Indicator Meaning
REF Reference mark crossed over – datum points are now stored in
nonvolatile memory.
Blinking: Waiting for confirmation from operator.
1 / 2 Datum point 1 / Datum point 2 currently active
in. Position values displayed in inches
SCL Scaling factor active
→→
→
→→
Set workpiece edge as datum.
Blinking: Waiting for confirmation from operator.
←←
→→
←
→
←←
→→
Set centerline between two workpiece edges as datum.
Blinking: Waiting for confirmation from operator.
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.
Touching the workpiece
Z
Y
X
Datum Setting with an Edge Finder
The special functions of your display unit enable you to use a HEIDENHAIN KT edge
finder to set a workpiece edge or the centerline between two workpiece edges as a
datum. The position displays take into account the edge finder diameter which you
entered in operating parameter P25.
If you are using the NDP 560 (which has no edge finder input) or if you want to use
the special functions with a tool, please see the instructions on the next page.
Workpiece edge as datum
➤ Select the datum.
➤ Press the SPEC FCT key once.
The indicator "Workpiece edge as datum" blinks.
➤ Press ENT.
The indicator glows steadily.
➤ Select the coordinate axis in which the tool
moves. The selected axis glows more brightly.
➤ Probe the workpiece with the edge finder until
the LEDs in the edge finder light up and the
display shows the position of the workpiece edge.
➤ Enter the new coordinate value for the probed
edge.
➤ Press ENT.
The workpiece edge is set to the new value, and the display shows the position of
the edge finder relative to the new datum.
This function ends automatically.
Z
Y
Workpiece edge as datum
X
X?
Centerline between two workpiece edges as datum
➤ Select the datum.
➤ Press the SPEC FCT key twice. The indicator
"Centerline as datum" blinks.
➤ Press ENT.
The indicator glows steadily.
➤ Select the coordinate axis in which the tool
Z
moves. The selected axis glows more brightly.
➤ Probe the workpiece with the edge finder until
the LEDs in the edge finder light up and the
Y
decimal point blinks.
➤ Probe the second workpiece edge with the edge
finder until the LEDs in the edge finder light up
X?
and the display shows the position of the
centerline. The decimal point glows steadily.
➤ Enter the new coordinate value for the
centerline.
Centerline as datum
➤ Press ENT.
The centerline is now set to the new value and the display shows the position of
the edge finder relative to the new datum.
This function ends automatically.
To cancel the datum setting function:
➤ When the indicator for the function is blinking: press CL
➤ When the indicator for the function is glowing steadily: press SPEC FCT
X
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