Siemens SLI-5310 Instruções de Operação descarregar pdf (Página 31)

31

The following relationship exists between

the eccentricity e, the mean graduation

diameter D and the measuring error M

(see illustration below):

M = ± 412 ·

M = Measuring error in ” (angular

seconds)

e = Eccentricity of the radial grating to

the bearing in μm

D = Graduation centerline diameter

in mm

Model Mean

graduation

diameter D

Error per

1 μm of

eccentricity

ERO 1420

ERO 1470

ERO 1480

D = 24.85 mm ± 16.5”

ERO 1225

ERO 1285

D = 38.5 mm ± 10.7”

e

D

3. Error due to radial runout of the

bearing

The equation for the measuring error M is

also valid for radial deviation of the bearing

if the value e is replaced with the eccentric-

ity value, i.e. half of the radial deviation (half

of the displayed value). Bearing compliance

to radial shaft loading causes similar errors.

4. Position error within one signal

period M

u

The scanning units of all HEIDENHAIN en-

coders are adjusted so that without any

further electrical adjustment being neces-

sary while mounting, the maximum posi-

tion error values within one signal period

will not exceed the values listed below.

Model Line

count

Position error within

one signal period M

u

TTL 1 V

PP

ERO

2 048

1 500

1 024

1 000

512

i ± 19.0”

i ± 26.0”

i ± 38.0”

i ± 40.0”

i ± 76.0”

i ± 6.5”

i ± 8.7”

i ± 13.0”

i ± 14.0”

i ± 25.0”

The values for the position errors within

one signal period are already included in

the system accuracy. Larger errors can

occur if the mounting tolerances are

exceeded.

Rotary encoders with inductive

scanning

All with all rotary encoders without integral

bearing, the attainable accuracy for those

with inductive scanning is dependent on

the mounting and application conditions.

The system accuracy is given for 20 °C and

low speed. The full use of all permissible

tolerances for operating temperature, shaft

speed, supply voltage, scanning gap and

mounting are to be calculated for the

typical total error.

Thanks to the circumferential scanning of

the inductive rotary encoders, the total

error is less than for rotary encoders

without integral bearing but with optical

scanning. Because the total error cannot

be calculated through a simple calculation

rule, the values are provided in the

following table.

Model System

accuracy

Total

deviation

ECI 1100

EQI 1100

EnDat01/21

± 280” ± 480”

ECI 1100

EBI 1100

EnDat22

± 120” ± 280”

ECI 1300

EQI 1300

EnDat22

± 65” ± 120”

ECI 1300

EQI 1300

EnDat01

± 180” ± 280”

ECI 100

EBI 100

± 90” ± 180”

Measuring error M as a

function of the mean

graduation diameter D

and the eccentricity e

M Center of graduation

M "True" angle

M‘ Scanned angle

Scanning unit

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