HEIDENHAIN ND 287 - GUIDE Bedienungsanleitung

ND 287

Centering

with Two Scanning Heads

English (en)

7/2018

Centering of graduation carriers with two scanning heads |

2HEIDENHAIN | ND 287 | User's Manual | 7/2018

1 Centering of graduation carriers with two scanning

heads

Centering with two scanning heads is considered to be the most accurate

centering method for the graduation carriers (circular scale or scale drum) of

modular angle encoders. With this centering method, the angle position is

directly used for centering; there is no need for any mechanical or optical auxiliary

geometry.

You can use this centering method with all HEIDENHAIN modular angle encoders

with 1 VPP or EnDat interface.

For more information, you can download an instructional video from the

download area at www.heidenhain.de.

Aids and requirements | 2

HEIDENHAIN | ND 287 | User's Manual | 7/2018 3

2 Aids and requirements

The following aids are needed for centering with two scanning heads:

Two scanning heads of the same design with the corresponding adapter cables

(one scanning head is needed only for the centering process)

ND 287 evaluation unit

Encoder module for the ND 287 evaluation unit for connection of an additional

HEIDENHAIN encoder to the X2 axis

Current product software

The current version of the product software

is available at www.heidenhain.de under

Software > Filebase > Evaluation Electronics > ND 287 > Software

The following additional requirements must be fulfilled:

Mounting option (threaded hole and installation space) for the second scanning

head directly opposite (180°)

Accessibility for removal of the second scanning head after centering

Preparing the graduation carrier of the angle encoder |

4HEIDENHAIN | ND 287 | User's Manual | 7/2018

3 Preparing the graduation carrier of the angle encoder

To perform centering, you have to roughly align the graduation carrier (circular scale

or scale drum) and mount the second scanning head.

Mount the graduation carrier according to the mounting instructions

Pre-center the graduation carrier mechanically or optically to a radial runout of

less than approx. 50 µm

Mount the scanning heads approximately directly opposite (180° ±5°) from

each other and align them as follows:

Rough alignment using a spacer shim or mounting aid

No fine adjustment necessary (signal amplitudes of approx. 0.7 VPP are

sufficient)

No adjustment of the reference mark signals required

Connect the scanning heads by means of the adapter cables to the encoder

inputs X1 and X2 of the ND 287 evaluation unit

Preparing the evaluation electronics (1 VPP interface) | 4

HEIDENHAIN | ND 287 | User's Manual | 7/2018 5

4 Preparing the evaluation electronics (1 VPP interface)

To perform centering, you have to configure the settings for the scanning heads

and the screen display on the ND 287 evaluation unit.

Product software V1.09 is required for centering via the 1 VPP interface.

Switch on the product

Press the Ckey

Press the SETUP ►INSTALLATION SETUP soft key

Enter the code number 95148, if required.

Make the following settings in the submenus:

In COUNTER SETTINGS, select the 2 AXES mode by pressing the 1 AXIS / 2

AXES soft key

In ENCODER SETUP ► INPUT X1 ►ENCODER TYPE, select LINEAR by

pressing the TYPE soft key

The ENCODER SETUP (X1) form allows you to define the following settings:

In the SIGNAL PERIOD field, press the COARSER or FINER soft keys

to select the corresponding value for the encoder (see "Signal period

settings", Page 6)

In the REFERENCE MARK field, select NONE by pressing the REF MARK

soft key

In the COUNT DIRECTION field, select the POSITIVE mode by pressing

the POSITIVE/ NEGATIVE soft key

Repeat the encoder settings for INPUT X2

In DISPLAY CONFIGURATION ►INPUT X1 ►DISPL. RESOLUTION, set the

display resolution to 0.0005 by pressing the COARSER or FINER soft keys

Repeat the display settings for INPUT X2

In COUNTER SETTINGS, open the FORMULA FOR FUNCTION f(X1,X2) form

by pressing the FUNCTION f(X1,X2) soft key

Enter the formula f(X1,X2)=(X1-X2)/2 in the FORMULA FOR FUNCTION

f(X1,X2) form and confirm with the ENTER key

In ERROR COMPENSATION ►INPUT X1, select the OFF mode by pressing

the ERROR COMP. soft key

Repeat the error compensation settings for INPUT X2

Press the SETUP ►JOB SETUP soft key

Make the following settings in the submenus:

In UNIT OF MEASURE, select mm by pressing the mm/inch soft key

In SCALING FACTOR, select OFF by pressing the ON/OFF soft key

Use the NAVIGATION key to switch to soft-key level 3

Press and hold the X1 soft key until the display value f(X1,X2) is shown

The evaluation unit's display shows the radial runout of the graduation carrier in

µm

The algebraic sign shows the direction of the radial runout

Preparing the evaluation electronics (1 VPP interface) |

6HEIDENHAIN | ND 287 | User's Manual | 7/2018

Settings for the 1 VPP interface

Press the SETUP ►INSTALLATION SETUP soft key

2 AXES

COUNTER

SETTINGS APPLICATION FUNCTION

f(X1,X2) f(X1,X2)=

(X1-X2)/2

SIGNAL PERIOD

see "Signal

period

settings",

Page 6

REFERENCE MARK NONE

ENCODER SETUP INPUT X1

INPUT X2 ENCODER TYPE LINEAR

COUNTING

DIRECTION POSITIVE

DISPLAY

CONFIGURATION

INPUT X1

INPUT X2

DISPLAY

RESOLUTION 0.0005

ERROR

COMPENSATION

INPUT X1

INPUT X2 OFF

SETUP ►JOB SETUP soft key

UNIT OF

MEASURE LINEAR mm

SCALING FACTOR INPUT X1

INPUT X2 OFF

Signal period settings

Encoder Signal period (µm)

ERP 4000/ERP 8000 1

ERP 1000 7.3

ERA 4200/ERO 2000 20

ERA 4400 40

ERA 4800 80

ERO 6000 25

ERO 6100 50

ERM 2200 200

ERM 200/ERM 2400 400

ERM 2900 1000

Preparing the evaluation electronics (EnDat interface) | 5

HEIDENHAIN | ND 287 | User's Manual | 7/2018 7

5 Preparing the evaluation electronics (EnDat interface)

To perform centering, you have to configure the settings for the scanning heads

and the screen display on the ND 287 evaluation unit.

Product software V0.36 (special version) is required for centering via the

EnDat interface.

Switch on the product

Press the Ckey

Press the SETUP ►INSTALLATION SETUP soft key

Enter the code number 95148, if required

Make the following settings in the submenus:

In COUNTER SETTINGS, select the 2 AXES mode by pressing the 1 AXIS /

2AXES soft key

In DISPLAY CONFIGURATION ►INPUT X1 ►DISPL. RESOLUTION, set the

display resolution to 0.0001 by pressing the COARSER or FINER soft keys

In DISPLAY CONFIGURATION ►INPUT X1 ►ANGLE DISPLAY, set the value

to +/-180°

Repeat the display settings for INPUT X2

In ERROR COMPENSATION ►INPUT X1, select the OFF mode by pressing

the ERROR COMP. soft key

Repeat the error compensation settings for INPUT X2

Press the SETUP ►JOB SETUP soft key

Make the following settings in the submenus:

In UNIT OF MEASURE ►ANGLE, select the value RADIAN MEASURE by

pressing the ANGLE soft key

In SCALING FACTOR ►INPUT X1,enter the value calculated by means of the

formula SCALING FACTOR = 4 / drum diameter [mm] using the keyboard

Example: Outside diameter of scale drum 127 mm →

scaling factor = 4 / 127 = 0.031

Repeat the scaling factor settings for INPUT X2

Use the NAVIGATION key to switch to soft-key level 3

Press and hold the X1 soft key until the display value X1 - X2 is shown

Use the NAVIGATION key to switch to soft-key level 2

Check whether the values are displayed in rad and change them, if necessary

The evaluation unit's display shows the radial runout of the graduation carrier in

The algebraic sign shows the direction of the radial runout

Preparing the evaluation electronics (EnDat interface) |

8HEIDENHAIN | ND 287 | User's Manual | 7/2018

Settings for the EnDat interface

Press the SETUP ►INSTALLATION SETUP soft key

COUNTER SETTINGS APPLICATION 2 AXES

DISPLAY RESOLUTION 0.0001

DISPLAY CONFIGURATION INPUT X1

INPUT X2 ANGLE DISPLAY +/- 180°

ERROR COMPENSATION INPUT X1

INPUT X2 OFF

SETUP ►JOB SETUP soft key

UNIT OF MEASURE ANGLE RADIAN MEASURE

SCALING FACTOR INPUT X1

INPUT X2 4 / drum diameter [mm]

Performing centering | 6

HEIDENHAIN | ND 287 | User's Manual | 7/2018 9

6 Performing centering

Centering of the graduation carrier (circular scale or scale drum) is performed

iteratively in multiple runs and becomes more accurate with every repetition.

Check the torque of the mounting screws on the graduation carrier. All screws

must be tightened with the same torque

Press Cto set the position display unit to zero

Performing centering:

Rotate the graduation carrier by at least one rotation and define the

minimum position value

Keep the graduation carrier in this position and press Cto set the position

display to zero

Rotate the graduation carrier by at least one rotation and find the maximum

position value

Keep the graduation carrier in this position and remember the position value

By tapping lightly perpendicularly to the scanning heads, move the

graduation carrier halfway to the position value displayed before

Pay attention to the direction of movement, the position value

being displayed must become smaller

Always move the graduation carrier perpendicularly to the

scanning heads

Repeat the centering process until the desired centering accuracy has been

reached

Centering is completed

Finish mounting of the graduation carrier according to the mounting instructions

Verify the centering accuracy again after mounting

Remove the second scanning head again

Adjust and mount the other scanning head in its final position according to the

mounting instructions

DR. JOHANNES HEIDENHAIN GmbH

Dr.-Johannes-Heidenhain-Straße 5

83301 Traunreut, Germany

+49 8669 31-0

+49 8669 32-5061

E-mail: [email protected]

Technical support +49 8669 32-1000

Measuring systems +49 8669 31-3104

E-mail: [email protected]

NC support +49 8669 31-3101

E-mail: [email protected]

NC programming +49 8669 31-3103

E-mail: [email protected]

PLC programming +49 8669 31-3102

E-mail: [email protected]

APP programming +49 8669 31-3106

E-mail: [email protected]

www.heidenhain.de

Original document

1259987 · 00 · 02 · 07/2018 · PDF *I1259987*

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