YASKAWA YASNAC J50 Connecting Manual page 156

20.2.30 SERVO OFF SIGNAL (XSVOFX, *SVOFY,
xSVOFZ, %3VOF(X,)
This signal is used for cutting with the axis mechanically clamped.
When the signal * SVOFX to ct contacts are open, servo lock for
a–axis is released. To clamp the machine, use M-function.
Shown below is the time chart of servo off signal, machine clamp,
auxiliary function and servo ready (SRDX to SRDct). Output
clamp command after positioning signal (DEN) is given.
M CODE
CLAMP COMMAND
UNCLAMP
COMMAND
MF
MACH
CLAM
* Svo
SRDX
FIN
*Activating at LOW.
(Normally closed contacts.)
Fig. 20.21 Time Chart of Servo Off Signal
When the signal * SVOFX to IXcontacts are open, parameter
#6064 can select execution or no execution of the follow-up
process.
#6064, DO= 1: X-axis follow-up process
#6064, DO= O: X-axis no follow-up process
Other axes can be selected by D 1, D2 and D3 in succession.
When executing the follow-up process, shift the current NC value
until the error counter becomes O, as if there has been a command
corresponding to the machine motion.
In this case, even when the SVOFF signal is restored to close,
the machine remains at the shifted position, and it moves to the
correct position when a subsequent absolute command is given,
because the current NC value has been shifted from the machine
position.
Conversely, when no follow- up process is executed, the servo
setting remains in the error counter.
Then the machine moves to
cancel the setting when the SERVO OFF signal is restored to close.
20.2.31 EXTERNAL DECELERATION (x+EDX, x-
EDX TO x+EDa, x-EDu)
This signal permits the maximum effective stroke of the machine in
the control and controls the high-speed operation. When the exter-
nal deceleration signal corresponding to axis is turned on during
rapid traverse or manual jog operation, if the axis direction coin-
cides with commanded direction, the machine decelerates to the
speed set by parameter #6340.
If not, it does not decelerate. In this case, other axes will not have
any effect.
\
X+EDX
Fig. 20.22
Cutting feed function (X+EDX to X+ED~) enable or disable can
be set by parameter #6012 to #60 13.
D3 D2
D1 DO D3
#6012
a z
Y x
External deceleration in plus direction
Enable =1, Disable =0
#60 13
c1 z Y x
External deceleration in minus direction
Enable =1, Disable =0
When the axis in moving meets the deceleration conditions,
feedrate parameter #6341.
,coMMAND~
"""x ~
Fig. 20.23
When command speed is smaller than deceleration speed, com-
mand speed takes priority.
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