Yaskawa J50M Instructions User Manual

Page 200

6.4 PREPARATION FOR STORED LEADSCREW
ERROR COMPENSATION AND STORED STROKE

Return to Reference Point

With an NC equipped with the stored
error compensation or the stored stroke limit func-

tions, either of the following two reference point

return motions must be performed after switching
on the power supply and before starting automatic

operation.

b .

Manual return to reference point (See 5.2.1)

E x e c u t e G 9 1

XO YO ZO ; in the MDI

mode.

This procedure is to teach the reference point
to the control, since doing so is necessary be-
cause both pitch error compensation and stored
stroke check are performed with reference to
the reference point.

Checking Parameter

When the control is equipped with the pitch error

compensation function or the stored stroke limit
function, set this parameter to “l”. With the
p a r a m e t e r

set to “l”, a return to the

reference point is required before starting cycles,
alarm codes (001 to 004 “reference point return

incomplete”) are displayed, if the CYCLE

key is

pushed without making a reference point return
immediately after turning on the power supply. Be
sure to perform the operation for return to reference
point.
Set this parameter to

“ 1“ when pitch error

compensation or stored stroke limit is provided.

6.5 PREPARATION FOR AUTOMATIC
OPERATION

The machine must be positioned properly accord-

ing to the part program prior to the start of auto-
matic operation.

After positioning the absolute

coordinate system for the machining must be set
properly by manual operation or programming.

1. When G92 is not programmed in a tape or

memory.

. Return the machine manually to the reference

point.
(Refer to 5.2.1.1 MANUAL RETURN TO REFERENCE
POINT).

. The G92 command according to the part pro-

gram should be executed by MDI .

G92

. Y.. .

;

REFERENCE

ABSOLUTE ZERO POINT (O, O)

Fig.

6.1

XO YO ZO

s e t t i n g i s r e q u i r e d ,

the coordinate of each axis

“O” easily using ORG key.

Refer to

4. 1.9

ORG

KEY.

E X A M P L E

;

GOO X...

;

When

ory.

When

Fig. 6.2

G92 is programmed in a tape or

the program requires G92 to be executed at

the reference point, return the machine to the
reference point by manual return to reference point
return.

EXAMPLE :

EOR ;

. ;

Fig. 6.3

When G28 and G92 are programmed .

When the program begins with G28 and with

and G92, move the machine manually in-

to the area where return to reference point

can

be performed.

EXAMPLE :

EOR ;

x... y.. .

. . .,

Y.. .

192

Fig. 6.4