HEIDENHAIN ND 760 User Manual

User’s Manual

ND 760 E

Position Display Units
for EDM

English (en)
1/2002

Status display:

SET = Datum setting
REF = Blinking:

Traverse the
reference points.
On continuously:
Reference points

have been traversed.
D = SHIFT function
1 2 Datum 1 or 2

Inch = Display in inches
SCL = Scaling factor

->II<- = Touch-off / Centerline

ND 760 E Position Display Unit
(for 3 axes)

HEIDENHAIN

Keys

• Select coordinate axis

• Select axis-specific operating
parameters

Trigger points 1 and 2 before reaching the erosion
depth

Trigger point with respect to MIN position

Keys

Numerical input

• Select datum 1 or 2

• Page backward in the list of special functions

• Page backward in the parameter list

• Cancel entry

• Reset the operating mode

• Zero the selected axis (if activated with P80)

• Select parameter: CL plus two-digit number

• Select the special functions

- Probe for center line

- mm/inch switchover

- Parameter entry

• Page forward in the list of special functions

Add key for the erosion depth

TP3, TP4
Additional switching points, defined with
respect to the top of the workpiece = 0

Trigger point for start position (HOME)

Trigger point for the erosion depth

Switchover from actual position display to MIN
position display

• Change algebraic sign

• Call the most recent dialog

• In the parameter list: change the parameters

SHIFT key
Use of double-function keys

• Confirm entry

• Page forward in the parameter list

3

4

This Manual describes the ND 760 E position display
unit with the following software number or higher:

Part I Operating Instructions

ND 760 E for three axes 366 590-01

About this manual

This manual is divided into two parts:

Part I: Operating Instructions

 Fundamentals of positioning
 ND functions

Part II: Installation and Specifications

 Description of operating parameters
 Switching inputs, switching outputs

Fundamentals 6

Switch-on, Traversing the Reference Marks 12

Datum Setting 13

Working with a Scaling Factor 16

MIN Position Display in the EDM Axis 17

Programming the Trigger Points 18

Add Key 19

Description of Switching Output Functions 20

Error Messages 23

Part II
Installation and Page 25
Specifications and following

Part I Operating Instructions

5

Fundamentals

The ND 760 E position display unit was conceived for use on
electrical discharge machines (EDM).

The following functions support operation with EDMs:

 7 switching outputs for the EDM axis

Fundamentals

 Display of the MIN position, the distance-to-go, and the

total depth in the EDM axis. Because of the quick up-and­down motion of the EDM axis, HEIDENHAIN
recommends displaying only the last minimum position
value.

 Simple compensation of the erosion depth with the aid of an

add key.

 Simple setup function for finding the center line between

two edges.

6

You can skip this chapter if you are already familiar with
coordinate systems, incremental and absolute dimensions,
nominal positions, actual positions and distance-to-go.

+Y

+Z

Graduation

Coordinate system

To describe the geometry of a workpiece, the Cartesian* coordinate
system is used. The Cartesian coordinate system consists of three
mutually perpendicular axes X, Y and Z. The point of intersection of these
axes is called the datum or origin of the coordinate system.

Think of the axes as scales with divisions (usually in millimeters) which
allow us to fix points in space referenced to the datum.

To determine positions on a workpiece, the coordinate system is laid
onto the workpiece.

The machine axes are parallel to the axes of the coordinate system.
The Z axis is normally the tool axis.

*) Named in honor of the French mathematician and philosopher

René Descartes (1596 to 1650)

Y

–X

+X

Datum or
origin

–Z

–Y

Fundamentals

Z

X

7

Datum setting

The workpiece drawing is used as the basis for machining the workpiece.
To enable the dimensions in the drawing to be converted into traverse
distances of machine axes X, Y and Z, each drawing dimension requires
a datum or reference point on the workpiece (since a position can only be
defined in relationship to another position).

Fundamentals

The workpiece drawing always indicates one absolute datum (the datum
for absolute dimensions). However, it may contain additional relative
datums.

In the context of a numerical position display unit, datum setting means
bringing the workpiece and the tool into a defined position in relation to
each other and then setting the axis displays to the value which
corresponds to that position. This establishes a fixed relationship
between the actual positions of the axes and the displayed positions.

You can set up to 9 absolute datum points and store them in
nonvolatile memory.

1225

750

320

Absolute
datum

0

700

125

216,5

900

950

250

216,5
125

0

-125

-216,5

Relative
datums

250

-250

-250

-125

-216,5

150

0

-150

0

300±0,1

0

0

325

450

8

Absolute workpiece positions

Each position on the workpiece is uniquely defined by its absolute
coordinates.

Z

Example Absolute coordinates of position

X = 10 mm
Y = 5 mm
Z = 0 mm

If you are working according to a workpiece drawing with absolute
dimensions, you are moving the tool to the coordinates.

Relative workpiece positions

A position can also be defined relative to the previous nominal position.
The datum for the dimension is then located at the previous nominal
position. Such coordinates are termed incremental coordinates or chain
dimensions. Incremental coordinates are indicated by a preceding I.

Example Relative coordinate of position 2 referenced to

position 1

If you are working according to a workpiece drawing with incremental
dimensions, you are moving the tool by the dimensions.

Sign for incremental dimensioning

A relative dimension has a positive sign when the axis is moved in the
positive direction, and a negative sign when it is moved in the negative
direction.

:

IX = 10 mm
IY = 10 mm

:

1

Y

X

1

5

10

Fundamentals

Z

Y

10

1

5

2

10

1

10

X

9

Nominal position, actual position and distance-to-go

The position to which the tool is to move is called the nominal position

S

). The position at which the tool is actually located at any given

(

moment is called the actual position (I).

The distance from the nominal position to the actual position is called the

distance-to-go (

).

R

Fundamentals

Sign for distance-to-go

When you are using the distance-to-go display, the nominal position
becomes the relative datum (display value 0). The distance-to-go is
therefore negative when you move in the positive axis direction, and
positive when you move in the negative axis direction.

Y

Z

I

S

R

X

10

Position encoders

The position encoders on the machine convert the movements of the
machine axes into electrical signals. The ND display unit evaluates these
signals, determines the actual position of the machine axes, and displays
the position as a numerical value.

Z

Workpiece

Y

If the power is interrupted, the relationship between the machine axis
positions and the calculated actual positions is lost. The reference marks
on the position encoders and the REF reference mark evaluation feature
enable the ND to quickly re-establish this relationship again when the
power is restored.

Reference marks

The scales of the position encoders contain one or more reference
marks. When a reference mark is crossed over, a signal is generated
which identifies that position as a reference point (scale datum =
machine datum).

When these reference marks are crossed over, the ND's reference
mark evaluation feature (REF) restores the relationship between axis
slide positions and display values which you last defined by setting the
datum. If the linear encoders have distance-coded reference marks,
you need to move the machine axes a maximum of only 20 mm to do
this.

X

Position
encoder

Scale in Distance-coded
linear encoder reference marks

Reference marks

Fundamentals

11

Switch-on, Traversing the Reference Marks

12

0 è 1

ENT...CL

ENT

Crossing over the reference marks stores the most recently defined
assignment of display values to axis slide positions for datum points 1
and 2 in nonvolatile memory.

Note that if you choose not to traverse the reference marks (by clearing
the dialog ENT ... CL with the CL key), this relationship will be lost if the

Switch-on, Traversing the Reference Marks

power is interrupted or when the unit is switched off.

If you wish to use multipoint axis error compensation, you
must traverse the reference marks (see Multipoint axis error
compensation)!

Turn on power (switch located on rear panel). REF
in the status display starts blinking.

Confirm reference traverse mode. REF indicator
stops blinking and stays on. Decimal points blink.

Cross over the reference marks in all axes (in any
sequence). Each axis display becomes active when
its reference mark is crossed over.

Datum Setting

If you want to save the datum points in nonvolatile
memory, you must first cross over the reference
marks.

Only after crossing over the reference marks can you set new
datums or activate existing ones.

In P70, you can select:
 Two datum points: The selected datum point

is displayed via 1 or 2

 Nine datum points: The selected datum point

is displayed in the uppermost axis via d1 to d9.

You set a datum by first pressing the corresponding axis key
and then entering a numerical value. To transfer the new
datum, press the ENT key. The CL key can be used to clear
an incorrect entry.

To call a datum you have set, proceed as follows:

You have set two datum points in P70:

Select datum 1 or 2.

You have set nine datum points in P70:

Press the datum key (d starts
blinking).

ENT

1

Enter a datum number (1 to 9).

Datum Setting

13

Probing workpiece edges to find a centerline datum

The edges to be probed run parallel to the Y axis.

Follow the procedure below for all centerlines between two edges.

Z

Datum Setting

PROBE MIDP.

1ST POS X (appears only briefly)

14

SPEC

FCT

ENT

X

Select a datum number (see page 13).

Select the special functions.

Confirm the probe centerline
function. SET lights.

Select the X axis (if not already selected).
The >❘❘<- status symbol starts blinking.

Touch the workpiece edge 1 with the tool.

Y

2

1

M

X = 0

X

ENT

The first position value 1 is captured.

Retract the tool from the workpiece.

2ND POS X (appears only briefly)

Touch the workpiece edge 2 with the tool.

Datum Setting

ENT

The second position value 2 is captured.

After the second position has been transferred, the center line
between the two edges is calculated and set as a datum. The current
position (2nd position probed) in relation to the center line is
displayed. Then the function is automatically terminated.

The function is always effective for the currently active axis (it is
possible to switch the axis before the 1st position has been
transferred).

SPEC

FCT

or

Exit the probing functions.

CL

15

Working with a Scaling Factor

Scaling factors enable you to increase or decrease the display values
based on the actual traverse distance. The display values are changed
symmetrically about the datum.

Enter scaling factors separately for each axis in parameter P12.

Parameter P11 activates and deactivates the scaling factors in all axes

Scaling Factor

(see Operating Parameters).

Example for enlarging a workpiece:

P12.1 3.5
P12.2 3.0
P11 ON

This results in a larger workpiece as shown in the illustration at right:
1 is the original size, 2 is with axis-specific scaling factors.

If a scaling factor is active, SCL lights in the status display.

Y

∗ 3.0

1

0

2

∗ 3.5

X

0

16

MIN position display in the EDM axis:

Since the EDM axis moves up and down very rapidly during
the EDM process, it is difficult to read the attained erosion
depth from the position display. The ND 760 E therefore
allows you to select an operating mode which displays the
last position value in the EDM axis.

Sequence of keys:

Call the MIN position display.

The MIN position display is active if the leftmost decimal
points light in all axes. The MIN position is internally updated
every 5 ms. However, the display is updated only approx.
every 30 ms in the MIN position display mode.

In this operating mode, the two other axes indicate the final
erosion depth and the distance-to-go (with respect to the
final erosion depth).

EDM axis X Y Z (standard)

Distance-to-go in EDM axis
(probe symbol lights) Y X X

In this operating mode, you cannot set any datums.

Exit the MIN position display mode.

MIN Position Display in the EDM Axis

Final erosion depth Z Z Y

Display value

MIN position of
EDM axis X Y Z

17

Programming the Trigger Points

18

Programming the Trigger Points:

1st trigger point before MIN position:

MIN. TP. 1

Switching output A1
Input range: 0 to 99 999.9999 mm

1st trigger point before reaching the erosion depth:

TRIG. PNT. 1

Switching output A3
Input range: 0 to 99 999.9999 mm

2nd trigger point before reaching the erosion depth:

TRIG. PNT. 2

Switching output A4
Input range: 0 to 99 999.9999 mm

Additional trigger point TP3:

TRIG. PNT. 3

Switching output A6 (depends on
parameter P21)
Input range: -99 999.9999 to
99 999.9999 mm

Additional switching point TP4:

TRIG. PNT. 4

Switching output A7 (depends on
parameter P21)
Input range: -99 999.9999 to
99 999.9999 mm

Trigger point for erosion depth:

ER. DEPTH

Switching output A5
Input range: -99 999.9999 to
99 999.9999 mm

Start position (HOME position):

START POS.

Switching output A6 (depends on
parameter P21)
Input range: -99 999.9999 to
99 999.9999 mm

After the respective trigger point has been called, the
currently valid value is displayed in the Y axis. You can enter a
new value with the numerical keys and transfer it with the
ENT key. To cancel this operating mode, press the SHIFT or
the CLkey.

The second trigger point before the MIN position is
programmed in parameter P17 (or P18).

Add key

COMP. DEPTH

Input range: -99 999.9999 to
99 999.9999 mm

After the compensation value has been called, the currently
valid value is displayed in the Y axis. You can enter a new
value with the numerical keys and transfer it with the ENT
key.

The compensation value is used to calculate a new erosion
depth. If no value is entered, the displayed value is used for
the calculation.

To cancel this operating mode, press the SHIFT or the CL key
(the displayed value is then not used for the calculation).

Add Key

19

Description of Switching Output Functions
(Settings in parameter P21: STANDARD)

After an EDM process, the transistors A1, A2, A3, A4 and A6
are locked. A5 is conductive.

A1, A2, A5, A6 switch whenever the the trigger point is
traversed.
A3, A4 switch only once, i.e. when the trigger point is
traversed for the first time.

Description of Switching Output Functions

20

The transistors A1, A2, A3 and A4 are locked, A5 and A6 are conductive.

START

Workpiece surface = 0

conductive

All transistors

= transistor conductive

= transistor locked

Start position (HOME) referenced to display value 0,
programmable with the keys.

Trigger points before MIN position

1st trigger point before MIN position, programmable with

the keys.

2nd trigger point before MIN position, programmable in

parameter 17 which is protected by a code number.

Trigger points with respect to erosion depth

1st trigger point before reaching the erosion depth,

programmable with the keys.

2nd trigger point before reaching the erosion depth,

programmable with the keys.

Trigger point for erosion depth, programmable with the

keys.

Description of functions:

Start position (HOME)

After an EDM process, when the EDM axis has returned to
the start position, the transistors A1, A2, A3, A4 and A6 are
locked (high-level outputs). A5 is conductive (low-level
output). The start position is referenced to the defined
workpiece datum of the EDM axis and is programmable with
the keys.

The second trigger point before the MIN position value is
defined in parameter P17 (or P18). This trigger point can be
used for functions whose trigger point must not be changed
by the operator. It could be used, for example, for changing
the switching functions for the speed controller for the EDM
axis so that the electrode retracts rapidly during the cyclic
retraction process in order to enable the controller to switch
back to the standard speed before the MIN position value has
been reached.

If the EDM generator and the start position are traversed in
the negative direction, the transistors for the outputs A1, A2,
A3, A4 and A6 become conductive (low-level outputs).

Trigger points before MIN position:

The ND 760 E can be switched from the standard actual
value display mode to the MIN position display mode, i.e. the
EDM axis always displays the minimum position value. Due
to the quick up-and-down motion of the EDM axis,
HEIDENHAIN recommends using this display mode for EDM
processes. You can define two trigger points that are
referenced to the MIN position value. The first trigger point is
defined with the keys.

The user can easily change this trigger point. The trigger
point can be used as a signal for reversing the direction of
movement during cyclic retraction (used to improve the
flushing process).

The transistors for both switching outputs are locked when
the electrode is retracted along the programmed path.
The transistor becomes conductive again as soon as the
electrode is located within the programmed path during the
downward motion.

Trigger points with respect to the erosion depth:

Before the erosion depth is reached, two trigger points can
be entered with the following keys:

and

Description of Switching Output Functions

These trigger points refer to the erosion depth. If the
electrode reaches the programmed distance from the
erosion depth, the corresponding transistor is locked. The
transistor remains locked even if the electrode is retracted
along the programmed path by the controller.

21

Trigger point for erosion depth

The trigger point for the erosion depth switches the EDM
generator off. The electrode automatically moves up to the
start position.

End of the EDM process

As soon as the start position (HOME) has been reached or
crossed over in the positive direction, the transistor for the
start position is locked (depends on P21). All transistors,
except A5, are then locked and the initial condition is
restored. At this stage, a new EDM process can be started.

Example of input for switching outputs

Switching output: Input:

Start position (HOME) + 10.000 mm

1st trigger point before MIN position 3.000 mm
2nd trigger point before
MIN position (P17 or P18) 0.100 mm

1st trigger point before reaching

Description of Switching Output Functions

the erosion depth 2.000 mm
2nd trigger point before reaching
the erosion depth 1.000 mm

Trigger point for erosion depth (END) - 20.000 mm

22

Error Messages

Message Cause and Effect

SIGNAL X Encoder signal is too weak,

e.g. when an encoder is
contaminated.

ERR. REF. X The spacing of the reference

marks as defined in P43 is not
the same as the actual spacing.

FRQ. X The input frequency for this

encoder input is too high. This
can occur when the scale is
moved too fast.

ERR. MEMORY Checksum error: Check the

datum, operating parameters and
compensation values for
multipoint axis error
compensation. If the error recurs,
contact your service agency!

To erase error messages:

After you have removed the cause of error:
➤ Press the CL key.

Error Messages

23

Part II Installation and

Specifications

Items Supplied 26

Connections on Rear Panel 27

Power Connection 28

Connecting the Encoders 29

Operating Parameters 30

Entering/changing operating parameters 30
List of operating parameters 31

Linear Encoders 35

Setting the display step 35
Compatible HEIDENHAIN linear encoders 36

Multipoint Axis Error Compensation 38

Switching Inputs/Switching Outputs 41

Specifications 43

Dimensions of ND 760 E 44

Part II Installation and Specifications

25

Items Supplied

 ND 760 E

 Power connector Id. Nr. 257 811-01

Items Supplied

 User's Manual

Connections on Rear Panel

ID label

Power switch

Power input

Switching inputs/
Switching outputs

Connections on Rear Panel

Protective ground Encoder inputs X1 to X3

The interfaces X1, X2, X3, and X10 comply with the requirements for electrical separation according to EN 50 178!

27

Power Connection

Power leads: and ,

L

N

Connect protective ground to !
Power supply: 100 Vac to 240 Vac (-15 % to +10 %)

50 Hz to 60 Hz (± 2 Hz)

A voltage selector is not necessary.

 Danger of electrical shock!

Power Connection

Connect a protective ground. This connection must never
be interrupted.

 Unplug the power cord before opening the housing.

To increase the noise immunity, connect the ground terminal
on the rear panel to the central ground point of the machine.
(Minimum cross-section: 6 mm

2

).

Connecting the Encoders

Your display unit will accept all HEIDENHAIN linear encoders with
sinusoidal output signals (7 to 16 mA
reference marks.

Assignment of the encoder inputs

Encoder input X1 is for the X axis
Encoder input X2 is for the Y axis
Encoder input X3 is for the Z axis

Encoder monitoring system

Your display unit features a monitoring system for checking the
amplitude and frequency of the encoder signals. If it detects a faulty
signal, one of the following error messages will be generated:

SIGNAL X

FRQ. X

Encoder monitoring can be activated with parameter P45.

If you are using linear encoders with distance-coded reference marks,
the encoder monitoring system also checks whether the spacing of
the reference marks as defined in parameter P43 is the same as the
actual spacing on the scales. If it is not, the following error message
will be generated:

) and distance-coded or single

pp

Connecting the Encoders

Z Y X

ERR. REF. X

29

Operating Parameters

Entering and changing operating parameters

Operating parameters allow you to modify the operating
characteristics of your display unit and define the evaluation
of the encoder signals. Operating parameters that can be
changed by the user are called user parameters, and can be
accessed with the SPEC FCT key and the dialog PARA­METER (user parameters are identified as such in the
parameter list). The full range of parameters can only be
accessed through the dialog CODE and by entering 95148.

Operating parameters are designated by the letter P and a

Operating Parameters

number. Example: P11. The parameter designation is shown
in the X display when you select it with the DATUM and ENT
keys. The parameter setting is shown in the Y display.

Some operating parameters have separate values for each
axis. Such parameters have an additional index number from
1 to 3

Example: P12.1 scaling factor, X axis

P12.2 scaling factor, Y axis
P12.3 scaling factor, Z axis

The operating parameters are preset before the unit leaves
the factory. These factory default settings are indicated in the
parameter list in boldface type.

To access the operating parameters

➤ Press the SPEC FCT key.
➤ Press the SPEC FCT key or 1 2 , until

PARAMETER appears in the X display.

➤ Confirm your selection by pressing ENT.

To select protected operating parameters

➤ Press the 1 2 key to select the

P00 CODE user parameter.

➤ Enter the code number 95148.
➤ Confirm with the ENT key.

To page through the operating parameters

➤ Page forwards by pressing the ENT key.
➤ Page backwards by pressing the 1 2 key.

To change parameter settings

➤ Press the minus key or enter the value and confirm

with the ENT key.

To correct an entry

➤ Press CL: the old value reappears in the input line and

becomes effective again.

To exit the operating parameters

➤ Press the SPEC FCT or CL key.

To exit the operating parameters

➤ Press the SPEC FCT or CL key.

List of operating parameters

P00 CODE Enter code number

9 51 48: Change protected operating parameters
66 55 44: Display the software version (in the X axis)

Display the date of release (in the Y axis)

10 52 96: Multipoint axis error compensation

P01 Unit of measure

1)

Display in millimeters MM
Display in inches INCH

P03.1 to P03.3 Radius/diameter display

1)

Display position value as radius RADIUS
Display position value as diameter DIAMETER

P11 Activate scaling factor

1)

Active SCALING ON
Not active SCALING OFF

P12.1 to P12.3 Define scaling factor

1)

Enter a scaling factor separately for each axis:
Entry value > 1: workpiece will grow
Entry value = 1: workpiece will remain the same size
Entry value < 1: workpiece will shrink
Input range: 0.100000 to 9.999999
Default setting: 1.000000

P13.1 to P13.3 Shrinkage compensation

Input range (µm): -99999 to +99999
Default setting: 0

Example: Input value = 2% corresponds to 20 000 µm/m
Please note: If you use the shrinkage compensation in
addition to the linear compensation, the compensation
values will superimpose each other multiplicatively.

P17 MIN.P2.1

2nd trigger point before MIN position, switching output A2
Input range: 0 to + 99999.9999 mm
Default setting: 0

P 18 MIN.P2.2

2nd trigger point for output A2
Input range: 0 to + 99999.9999 mm
Default setting: 0

In parameter P20, you select the trigger point to be effective
for output A2 (trigger point defined in P17 or P18).

Operating Parameters

1)

User parameter

31

P20 E1-E3

Define the functions of the switching inputs E1, E2, E3.

EXT. SET TO ZERO (default setting)

The axes X, Y, or Z are set to zero with a switching pulse
(0V at inputs E1, E2 or E3).

AXIS SELECTION

Depending on the condition of the switching inputs E1 and
E2, the EDM axis varies.

E1 E2 EDM axis
Low Low Z

Operating Parameters

High Low Y
Low High X
High High Z

The input E3 allows you to select the trigger point to be
effective for the output A2 (trigger point defined in P17 or
P18).

E3 Trigger point off
Low P18
High P17

The axes can no longer be set to zero.

P21 DEF.TP

Define the functions of the trigger points.

STANDARD (default setting)

Standard switching function
(switching functions TP3 and TP4 are not used)

TP3 + 4

The output A6 is assigned to switching point TP3 (no longer
to HOME). The output A7 is assigned to switching point TP4.
Both trigger points are referenced to workpiece datum = 0
(they can be used, for example, to change the generator
settings).

TP3 + 4 CODE

Function as described above (TP3 + 4).
The trigger points at the outputs A3, A4, A6, and A7 are
transmitted in coded form:

Output Code Value
A3 Bit 0 2
A4 Bit 1 2
A6 Bit 2 2
A7 Bit 3 2

0

1

2

3

= 8

= 1
= 2
= 4

The assignment of code values to trigger points is described
in parameters P22 to P25.

P22 CODE 1

Code value for trigger point TP3.
Input range: 0 to 15
Default setting: 0

P23 CODE 2

Code value for trigger point TP4.
Input range: 0 to 15
Default setting: 0

P24 CODE 3

Code value for trigger point A3 (1st trigger point before
erosion depth)
Input range: 0 to 15
Default setting: 0

P25 CODE 4

Code value for trigger point A4 (2nd trigger point before
erosion depth)
Input range: 0 to 15
Default setting: 0

Example: 1st trigger point before erosion depth P24 = 10;

Value 8421
Binary value 1010= decimal value 10

Output A7 A6 A4 A3
Transistor conductive X X
Transistor locked X X

Definition: Bit = 0 ........output transistor conductive

Bit = 1 ........output transistor locked

P30. 1 to P30.3 Counting direction

Positive counting direction with
positive direction of traverse DIRECT. POS

P31.1 to P31.3 Signal period of the encoder

Input range: 0.00000001 to 99999.9999 µm
Default setting: 10 µm

P33.1 to P33.3 Counting mode

0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9

0 - 2 - 4 - 6 - 8
0 - 5

P38.1 to P38.3 Decimal places

2 / 3 / 4 / 5 / 6 / 7 / 8 (up to 8 with inch display)

P40.1 to P40.3 Select type of axis error compensation

No axis error compensation COMP. OFF

Linear error compensation active,
multipoint error comp. not active COMP. LIN

Multipoint error compensation active,
linear error compensation not active COMP. MULTI

Operating Parameters

Negative counting direction with
positive direction of traverse DIRECT. NEG

33

P41.1 to P41.3 Linear axis error compensation

Input range (µm): -99999 to +99999
Factory default setting: 0

Example: Displayed length Ld = 620.000 mm

Actual length (as determined for example with
the VM 101 from HEIDENHAIN)

La = 619.876 mm

Difference DL = L

 Ld =  124 µm

a

Compensation factor k:
k = DL/Ld =  124 µm/0.62 m =  200 [µm/m]

P43.1 to P43.3 Reference marks

Operating Parameters

One reference mark SINGLE REF. M.
Distance-coded with 500  SP 500 SP
Distance-coded with 1000  SP 1000 SP
Distance-coded with 2000  SP 2000 SP
Distance-coded with 5000  SP 5000 SP
(SP: signal period)

P44.1 to P44.3 Reference mark evaluation

Evaluation REF. X ON
No evaluation REF. X OFF

P45.1 to P45.3 Encoder monitoring

Amplitude and frequency
monitoring ALARM ON
No monitoring ALARM OFF

P48.1 to P48.3 Activate axis display

Axis display active AXIS ON
Not active AXIS OFF

P70 Number of datum points

2 datum points 2 DATUM PT.
9 datum points 9 DATUM PT.

Function of the CL key

Set to zero with CL CL....RESET

No set to zero with CL CL......OFF

P98 Conversational language

1)

German LANGUAGE DE
English LANGUAGE EN
French LANGUAGE FR
Italian LANGUAGE IT
Dutch LANGUAGE NL
Spanish LANGUAGE ES
Danish LANGUAGE DA
Swedish LANGUAGE SV
Finnish LANGUAGE FI
Czech LANGUAGE CS
Polish LANGUAGE PL
Hungarian LANGUAGE HU
Portuguese LANGUAGE PT

1)

User parameter

Linear Encoders

The display unit is designed for connection of photoelectric
encoders with sinusoidal signals of 7 µA

Selecting the display step with linear encoders

To select a certain display step, you must define the following
operating parameters:

 Signal period (P31)
 Counting mode (P33)
 Decimal places (P38)

Example

Linear encoder with a signal period of 10 µm

Desired display step ................ 0.000 5 mm

Signal period (P31) ................... 10

Counting mode (P33) ............... 5

Decimal places (P38) ............... 4

The following tables will help you select the parameters.

to 16 µAPP.

PP

Linear Encoders

35

Parameter settings for HEIDENHAIN linear encoders with 11 µA

Model

Linear Encoders

CT
MT xx01
LIP 401A/401R

LF 103/103C
LF 401/401C
LIF 101/101C
LIP 501/501C
LIP 101

MT xx 10 Single 0.0005

LS 303/303C
LS 603/603C

P 31 P 43

2

4

20 Single/1000 0.01

Reference
mark

Signal period

[µm]

Single 0.0005

Single

Single/5000

Single

Millimeters Inches

Display
step
[mm]

0.0002

0.0001

0.00005
Recommended only for LIP 401

0.00002

0.00001

0.000005

0.001

0.0005

0.0002

0.0001

0.00005
Recommended only for LIP 101

0.00002

0.00001

0.0002

0.0001

0.005

Counting

mode

Decimal

P 33 P 38

5
2
1
5

2
1
5

1
5
2
1
5

2
1

5
2
1

1
5

4
4
4
5

5
5
6

3
4
4
4
5

5
5

4
4
4

2
3

PP

Display
step
[inch]

places

0.00002

0.00001

0.000005

0.000002

0.000001

0.0000005

0.0000002

0.00005

0.00002

0.00001

0.000005

0.000002

0.000001

0.0000005 15

0.00002

0.00001

0.000005

0.0005

0.0002

Counting

mode

Decimal

P 33 P 38

2
1
5
2

1
5
2

5
2
1
5
2

2
1
5

5
2

5
5
6
6

6
7
7

5
5
5
6
6

6
7

5
5
6

4
4

places

Parameter settings for HEIDENHAIN linear encoders with 11 µA

(continued)

Signal period

[µm]

Reference
mark

Single/1000

-

Millimeters Inches

Display
step
[mm]

Counting

mode

Decimal

P 33 P 38

0.001

0.0005

0.005

0.002

0.001

0.0005
Recommended only for LB 302

0.0002

0.0001

0.002

0.001

0.01

0.05

1
5

5
2
1
5

2
1

5
2
1

1
1
5

3
4

3
3
3
4

4
4

3
3
3

1
2
2

Model

P 31 P 43

LS 106/106C
LS 406/406C
LS 706/706C

ST 1201

LB 302/302C

LIDA 10x/10xC

LB 301/301C 100 Single/1000 0.005

LIM 501 10240 Single 0.1

20

40 Single/2000

PP

Display
step
[inch]

places

0.00005

0.00002 52

0.0002

0.0001

0.00005

0.00002

0.000001

0.0000005 15

0.0002

0.0001

0.00005

0.005

0.0005

0.002

Counting

mode

Decimal

P 33 P 38

5
5

2
1
5
2

2
1
5

5
5
2

4
4
5
5

5
6

4
4
5

3
4
3

places

Linear Encoders

37

Multipoint Axis Error Compensation

Entries in the compensation-value table

If you want to use the multipoint axis error
compensation feature, you must
 activate this feature with operating parameter 40

(see "Operating Parameters"),

 traverse the reference marks after switching on the

display unit,

 enter a compensation value table.

Your machine may have a nonlinear axis error due to factors
such as axis sag or drivescrew errors. Such deviations are
usually measured with a comparator measuring system (such
as the HEIDENHAIN VM 101).

You can, for example, determine the screw pitch error X=F(X)
for the X axis.

An axis can only be corrected in relation to one axis that has
an error. In each axis, a compensation value table with
64 compensation values can be generated. You can select

Multipoint Axis Error Compensation

the compensation table with the SPEC FCT key and the
PARAMETER\CODE dialog.

To determine the compensation values (e.g. with a VM 101),
the REF display must be selected after selecting the
compensation-value table.

Select the REF display.

The decimal point in the left display field indicates that the
displayed values are referenced to the reference point. If the
decimal point blinks, the reference marks have not been
traversed.

 Axis to be corrected: X, Y or Z

 Axis causing the error: X, Y or Z

 Datum for the axis to be corrected:

Here you enter the point starting at which the axis with
error is to be corrected. This point indicates the absolute
distance to the reference point.

Do not change the datum point after measuring the
axis error and before entering the axis error into the
compensation table.

 Spacing of the compensation points

The spacing of the compensation points is expressed as

x

2

[µm].

Enter the value of the exponent x into the compensation
value table.
Minimum input value: 6 (= 0.064 mm)
Maximum input value: 20 (= 1048.576 mm)

23 (= 8388.608 mm)

Example: 900 mm traverse and 15 compensation points

results in 60.000 mm spacing between points.
Nearest power of two: 2

16

[µm] = 65.536 mm

Entry in compensation value table: 16

 Compensation value

You enter the measured compensation value (in
millimeters) for the displayed compensation point.
Compensation point 0 always has the value 0 and
cannot be changed.

Selecting the compensation table, entering an axis correction

SPEC

FCT

SPEC

or

FCT

PARAMETER

CODE

AXIS X

X FCT. X

ENT

ENT

Select the special functions.

Select the "parameter" function if
required, by repeatedly pressing the
1 2 key.

Select dialog for entering the code
number.

Enter code number 105296 and
confirm with ENT.

ENT

Select axis to be corrected, e.g. X.

Confirm with ENT.

Enter the axis causing the error, e.g. X
(screw pitch error), and confirm with
ENT.

DATUM X

SPACING X

27.000

ENT





ENT

ENT

Enter the active datum for the error on
the axis to be corrected (e.g. 27 mm)
and confirm with ENT.

Enter the spacing of the compensation
points on the axis to be corrected, for
example 2

10

mm (equals 1.024 mm) and

confirm with ENT.

Compensation point no. 1 is displayed.
Enter the associated compensation
value (e.g. 0.01 mm) and confirm with

ENT

ENT.

Multipoint Axis Error Compensation



39



Deleting a compensation-value table

28.024

or

Multipoint Axis Error Compensation

Enter all further compensation points. If
you press the minus key, the number of
the current compensation point will be
shown in the X display. Direct selection
of compensation
points: Press the minus key together
with the number (two-digit) of the
desired compensation point.

Conclude entry.

SPEC

FCT

SPEC

or

FCT

PARAMETER

CODE

AXIS X

DELETE Z

Select the special functions.

Select the parameter" function.

Select the dialog for entering the code
number.

Enter the code number 105296 and
confirm with ENT.

Select the compensation value table
(e.g., for the Z axis), and delete the table.

Confirm with ENT, or cancel with CL.

Conclude entry.

Switching Inputs/Switching Outputs X10

Outputs at the D-sub connection X10

Danger to internal components!

The voltage of external electric circuits must meet
the requirements for functional extra-low voltage
with electrical separation according to EN 50 178.
When connecting inductive loads, be sure to connect
a suppressor diode in parallel with the inductance.

Use only shielded cables!

Connect the shield to the connector housing.

Inputs at the D-sub connection X10

Pin Function

1 E1 Set X axis to zero

9 E2 Set Y axis to zero

2 E3 Set Z axis to zero

30 volt

10 0 volt

The axis that has been set to zero becomes the active axis
(SET symbol lights).

Pin Function

8 A0 Non-functional

7 A1 1st trigger point 1 before MIN position value

6 A2 2nd trigger point before MIN position value

5 A3 1st trigger point before erosion depth

15 A4 2nd trigger point before erosion depth

14 A5 Erosion depth

13 A6 Start position (Home) or TP3 (P21)

12 A7 TP4

40 volt

11 0 volt

Switching Inputs/Switching Outputs

During parameter input, it is not possible to externally set the
axis to zero.

41

Inputs

Outputs

Input signals

Internal "pull-up" resistor 1 kW, active low

Triggered by contact closure against 0 V or
low-level voltage via TTL module

Minimum pulse duration: t

> 30 ms

min

Signal level of inputs

Status Level

High + 3.9 V £ U £ + 15 V

Low  0.5 V £ U £ + 0.9 V; I £ 6 mA

Switching Inputs/Switching Outputs

E

0V

E

0V

Output signals

Open collector outputs, active low

Delay time for signal output: tv £ 30 ms

Signal level of outputs

Status Level

High U £ + 32 V; I £ 10 µA

Low U £ + 0.4 V; I £ 100 mA

t

³ 30 ms

min

t

min

Specifications

Housing ND 760 E

Cast-metal housing
Dimensions (W  H  D)
281 mm  205 mm  97.5 mm

Oper. temperature 0° to 45° C (32° to 113° F)

Storage temperature 20° to 70° C (4° to 158° F)

Weight Approx. 2.3 kg (5 lb)

Relative humidity <75% annual average

<90% in rare cases

Power supply 100 Vac to 240 Vac (-15 % to +10 %)

50 Hz to 60 Hz (± 2 Hz)

Power consumption 15 W

Protection IP40 as per EN 60 529

Encoder inputs For encoders with 7 to 16 µA

Grating period 2, 4, 10, 20, 40,
100, 200 µm and 12.8 mm
Reference mark evaluation for
distance-coded and single
reference marks

Input frequency Max. 100 kHz for 30 m (98.5 ft)

cable length

Display step Adjustable

(see Linear Encoders)

Datums 9 (nonvolatile)

Functions - 7 switching outputs

- Scaling factor

- Probing functions

- MIN position display

- Add key for erosion depth

- External set to zero

PP

Specifications

43

Dimensions in mm

Specifications

F = Opening for panel mounting M = Mounting surface

D = Complete seal

HEIDENHAIN (G.B.) Limited

200 London Road, Burgess Hill
West Sussex RH15 9RD, Great Britain

{ (0 14 44) 2477 11
| (0 14 44) 87 00 24

367 126-21 · SW366 590-01 · 3 · 1/2002 · F&W · Printed in Germany · Subject to change without notice

45