YASKAWA YASNAC J50 Connecting Manual page 113

19.2.9 REFERENCE POINT RETURN CONTROL l/O
SIGNALS (ZNR, xDCX, xDCZ)
These are input and output signals for bringing the machine to the
machine reference point upon the enegization of the control.
(1) Grid Method
Reference point is determined by the origin pulse
(lpulse/revolu-tion) of the position detector. After turning on
the power supply, when themanual jogmodeis turned on, and
the manual reference point return input contact ZRN is closed ,
the direction of axis motion set by parameter ZRNDRX,
ZRNDRZ (#6010 DO, Dl) will result in the reference point
return motion as shown below. (The same applies to the
execution of G28 intheautomatic operation modes.)
SPEED
RAPID TRAVERSE RATE
(#6280, #6281)
I /
APPROACH SPEED 1
(#6310, #6311)
/
TRAVERSE DISTANCE
Y
SPEED SEQUENCE
I
I
I
I
DECEL LS SIGNAL
1 II
(*DCX, *DCZ)
~.-. ZERO POINT PULSE
Fig 19.4
When the machine is returned to the reference point once, the return
motion, thereafter will be in the positioning motion to the deter-
mined reference point.
RAPID TRAVERSE
SPEED
(#6280, #6281)
I
SPEED
Y
SEQUENCE
Fig. 19.5 Reference Point
Return Motion after First Power ON
(2) X and Z Reference Points (ZPX, ZPZ) Output
While themachine isremaining atthe reference point after the
reference point return motion or positioning to the reference
point, the ZPXand ZPZoutput contacts are closed. Ifthe actual
position is not within +3 pulses from the reference point due to
the use of metric input in the inch output system orvice versa,
the ZPX and ZPZ output contacts are not closed.
(3) 2nd Reference Point (2ZPX, 2ZPZ) Output
When the machine has beed positioned to the 2nd reference
point by the execution of the part program command G30 in the
automatic operation mode, the 2ZPX, and 2ZPZ output relays
are closed, andremain closed as long as the machine remains at
this point. The 2nd reference point is defined by the distance
from the reference point as set byparameters XZP2L, ZZP2L
(#6612, #6613).
19.2.10 MANUAL ABSOLUTE ON/OFF (ABS)lNPUT
During the execution of part programs in the automatic operation
mode, the control stores the command values in an internal com-
mandvalue register (command values aredisplayed on the lst CRT
area), and the displacement distance between the stored value and
the coordinate value in the part program.
Since thecontrol must also control the current position, it controls
the current values in the absolute coordinate system (to be
displayed inthe2nd CRT area. Thecoordionate system is defined
by a coordinate system setting command.)
This input is for determing whether the current value in the absolute
coordinate system is transferred to the command value register or
not at the start of the execution of the respective bloks of part pro-
grams in the automatic mode.
. When ABS input relay is open: Does not transfer.
. When ABS input relay is closed: To be transfemed, except when
circular interpolation is used.
The motion path after a manual control intervention in the auto-
matic operation mode is changed as follows by an ABS input.
However, when parameters MZRNHS, AZRNHS (#6010 D4, D5)
are set to 1, the same reference point return motion is obtained also
for the 2nd time onward.