Appendix-3 stored leadscrew error compensation – Yaskawa J50M Instructions User Manual

Page 247

APPENDIX-3 STORED LEADSCREW ERROR COMPENSATION

This function automatically compensates for
screw error on each axis according to the compen-
sation data set by parameter and is effective after
completion of reference point return.

The compen

sation data are made on the distances between the

reference point on each axis and specified points.

Compensation axes : X-, Y-, Z- and 4th-axes.

(including rotary axis)

No. of correction points: 512 Max.

Compensation base point: Reference point

Compensation interval:

10000 pulses or more

However, if the following conditions are satisfied,
compensation interval can be less than 10000 pulses.

—

X 8 X 1 0

- 3

X N + 1 0 0

o r m o r e

F : Maximum feeding speed

(quicker between rapid traverse or cutting

N : Compensation magnification

(by parameter

(Example) 15

compensation magnification : 2

—

x 8 x 10

- 3

X 2 + 100

4 1 0 0 p u l s e s

Note : With 6000 pulse interval at 24

for

multiplication, on the contrary to the above example,
position is shifted by improper pulse counting.

Data setting system:

Absolute /incremental

(Set by Parameter

Compensation value:

Minimum compensation unit: 1

pulse ( least out-

put increment)

Compensation multiplication: X3 max.
One-time-compensation value:

15 pulses max.

(Compensation multiplication)

Note 1:

Regardless of absolute/incremental setting, the
difference between neighboring compensation
values should be ( 15 pulses x compensation

m u l -

tiplication ) and below.

Note 2:

Maximum set value in case of absolute setting is

pulses.

Compensation multiplication is taken

on this value.

Note 3:

of correction points on each axis can be

arbitrary as far as the total compensation points
are within 512.

Note 4:

Where the 4th and 5th axis is a rotary axis ,
operation is possible within

revolution

maximum.

Note 5:

For the axis requiring no

error com-

pensation, set the parameter for compensation
multiplication factor at “O. “

Note 6:

Setting at base point is to be made in such a

manner that the pitch error compensation
value will not occur. In the example shown
below, the incremental set point of #8002

should be zero. Ales, set the absolute set

point in such a manner that the difference
between #8001 and #8002 becomes “O. ”

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