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NPL 20, NPL 30
Quick Reference Guide: Functions
Reference Mark Evaluation
The NPL 20/30's reference mark evaluation feature
automatically re-establishes the relationship between
axis slide positions and display values that you last
defined by setting the datum.
If the axis encoder has reference marks, the REF
indicator will flash. After crossing over the reference
marks, the indicator will stop flashing and change to
non-flashing REF.
Working without reference mark evaluation
You can also use the NPL 20/30 without crossing over
the reference marks. Press the NO REF soft key to exit
the reference mark evaluation routine and continue.
You can still cross over reference marks at a later
time, if it becomes necessary to define datums that
can be re-established after a power interruption. Press
the ENABLE REF soft key to activate the reference mark
evaluation routine.
If an encoder is setup without reference
marks, then the REF indicator will not be
displayed, and datums will be lost once
power is turned off.
ENABLE/DISABLE REF function
The toggling ENABLE/DISABLE soft key, that is present
during the Reference Mark Evaluation routine, allows
the operator to select a specific Reference Mark on an
encoder. This is important when using encoders with
Fixed Reference Marks. When the DISABLE REF soft
key is pressed, the evaluation routine is paused and
any reference marks that are crossed during encoder
movement are ignored. When the ENABLE REF soft key
is then pressed, the evaluation routine once again
becomes active and the next crossed reference mark
will be selected.
Once reference marks for all desired axes are
established, press NO REF soft key to cancel out of
routine. You do not have to cross over the reference
marks of all the encoders, only those that you need. If
all reference marks have been found the NPL 20/30
will return to the DRO display screen automatically.
If you do not cross over the reference marks,
NPL 20/30 does not store the datum points.
This means that it is not possible to re-
establish the relationship between axis slide
positions and display values after a power
interruption (switch-off).
Help Screen
The integrated operating instructions provide
information and assistance in any situation. To call the
operating instructions:
Press the HELP soft key.

 Information relevant to the current operation will be
displayed.
 Use the UP/DOWN ARROW keys if the explanation is
spread over more than one screen page.
To view information on another topic:
 Press the list of topics soft key.
 Press the UP/DOWN ARROW keys to scroll through the
index.
Press the ENTER key to select the item you need.

To leave the operating instructions:
Press the C key.

List of Topics under HELP mode
Datums
The workpiece drawing identifies a certain point on
the workpiece (usually a corner) as the absolute
datum and perhaps one or more other points as
relative datums.
The datum setting procedure establishes these points
as the origin of the absolute or relative coordinate
systems. The workpiece, which is aligned with the
machine axes, is moved to a certain position relative
to the tool and the display is set either to zero or to
another appropriate value (e.g., to compensate for tool
radius).
Datum Hard key
The easiest way to set datum points is to use the
NPL 20/30's probing function when you probe the
workpiece with an edge of a tool.
Of course, you can also set datum points in the
conventional manner by touching the edges of the
workpiece, one after the other with a tool and
manually entering the tool positions as datum points.
The datum table can hold up to 10 datum points. In
most cases this will free you from having to calculate
the axis travel when working with complicated
workpiece drawings containing several datums.
Tool Hard Key
This hard key opens the tool table and provides access
to the TOOL form for entering a tool's parameters.
The NPL 20/30 can store up to 16 tools within the tool
table.
Tool Table in Milling
Graphic Positioning Aid
When you are traversing to display value zero (in the
incremental mode), NPL 20/30 displays a graphic
positioning aid.
NPL 20/30 displays the graphic positioning aid in a
narrow rectangle underneath the currently active axis.
Two triangular marks in the center of the rectangle
symbolize the nominal position you want to reach.
A small square symbolizes the axis slide. An arrow
indicating the direction appears in the square while
the axis is moving. Note that the square does not
begin to move until the axis slide is near the nominal
position.
Operating Modes
The NPL 20/30 has two operating modes: Distance-
To-Go (INCREMENTAL) and Actual Value (ABSOLUTE).
The Distance-To-Go feature (which will be referred to
as incremental in this manual) enables you to
approach nominal positions simply by traversing to
display value zero. When working within the
incremental mode you can enter nominal coordinates
as either incremental or absolute dimensions. The
Actual Value feature (which will be referred to as
absolute in this manual) always displays the current
actual position of the tool, relative to the active datum.
In this mode, all moves are done by traveling until the
display matches the nominal position that is required.
While in the Absolute Mode, if the NPL 20/30 is
configured for Milling applications, only the tool length
offsets are active. Both the radius and length offsets
are used in the Distance-To-Go mode to calculate the
amount of "distance-to-go" required to get to the
desired nominal position relative to the edge of the
tool that will be doing the cutting. If the NPL 20/30 is
configured for a lathe, all tool offsets are used in both
the Incremental and Absolute modes.
Press the INCREMENTAL/ABSOLUTE hard key to toggle
between these two modes.
The turning application provides a quick method for
coupling the Z axes position on a 3 axis system.
Nominal position S, actual position I and distance-to-
go R
Circle and linear Patterns (Milling)
Press the CIRCLE PATTERN or LINEAR PATTERN hard
keys to select the desired hole pattern function and
enter the required data. This data can usually be taken
from the workpiece drawing (e.g. hole depth, number
of holes, etc.). With hole patterns, the NPL 20/30 then
calculates the positions of all the holes and displays
the pattern graphically on the screen.The View
Graphic enables verification of the hole pattern before
you start machining. It is also useful when selecting
holes directly, executing holes separately, and
skipping holes.
R (Radius/Diameter) Soft Key
X
Drawings for lathe parts usually give diameter values.
NPL 20/30 can display either the radius or the
diameter for you. When the diameter is being
displayed, the diameter symbol (¬) is shown next to
the position value.
Example: Radius display, position 1 X = 20 mm
Diameter display, position 1 X = ¬ 40 mm
Press the R soft key to switch between radius display
X
and diameter display.