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Ii – 2 installation set u p – HEIDENHAIN ND 287 User Manual User Manual

Page 75

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ND 287

75

II – 2 Installation Set

u

p

Analog sensor with ±10 V interface, preferably a temperature
sensor

In the COUNT DIRECTION field, select the count direction by

pressing the POSITIVE/ NEGATIVE soft key. If the encoder's count

direction matches the user's traverse direction, select POSITIVE. If

the directions do not match, select NEGATIVE.

In the four following fields, enter any two voltage/measured-value

pairs for the correct definition of the analog sensor: At first, enter the

values in the VOLTAGE 1 and MEASURED VALUE 1 fields, and then

in the VOLTAGE 2 and MEASURED VALUE 2 fields. The ND 287

uses the values to calculate a linear relationship between input

voltage and measured value in the range from –10 V to +10 V. To

ensure the highest possible measuring accuracy, enter the voltage

values with an accuracy of 5 mV.

If you have selected COMPENSATION for INPUT X2 in the

ENCODER TYPE field in the ENCODER SETUP menu, two further

parameters for defining temperature-dependent axis-error

compensation are displayed.

In the COEF. OF EXPANSION field, enter a value for the coefficient

of expansion E in µm/mK.

In the REF. TEMPERATURE field, enter the temperature T

R

to be

deducted from the measured temperature.

The axis-error compensation is calculated according to the following

formula:

L_1 = L_0 * (1 + E * (T - T

R

))

L_1: Compensated linear value of the encoder at input X1 after

axis-error compensation

L_0: Displayed linear value of the encoder at input X1 without

compensation

E: Coefficient of expansion in µm/mK

T: Temperature measured in °C

T

R

: Defined reference temperature in °C

Press ENTER to confirm your entry.

The ND 287 constantly displays the measured temperature on the

left side of the message line.

Fig. II.19 Analog sensor form

Fig. II.20 Analog sensor form

Fig. II.21 Temperature sensor form

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