FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

PROGRAMMING
21. AXIS CONTROL FUNCTIONS
B–62764EN/01
460
In synchronous axis control, commands that require no axis motion, such
as the workpiece coordinate system setup command (G92) and the local
coordinate system setup command (G52), are set to the Y axis by program
command Yyyyy issued to the master axis.
For signals such as external deceleration, interlock, and machine lock,
only the signals issued to the master axis are valid in the synchronous
operating mode. Signals issued to other axes are ignored.
Both the pitch error and backlash are compensated independently for the
master axis and the slave axis.
Turn on the manual absolute switch (ABS = 1) during synchronous
operation. If it is off, the slave axis may not move correctly.
The difference between the master axis and slave axis in servo positional
deviation is always monitored. If the difference exceeds the parameter–
set limit, an P/S alarm (No. 213) is issued.
The difference between the master axis and slave axis in machine
coordinates is always monitored. If the difference exceeds the parameter–
set limit, an P/S alarm (No. 407) is issued.
When the power is turned on, compensation pulses are output for the slave
axis to match the machine position of the master axis with the machine
position of the slave axis. (This is enabled only when the absolute
position detection function is used.)
Compensation for out–of–synchronism (where the difference between
the master and slave axes in servo positional deviation is always
monitored and the servo motor for the slave axis is compensated to reduce
the difference) is not performed.
When the machine is manually returned to the reference position during
synchronous operation, both the master axis and the slave axis move
synchronously until the acceleration movement is complete. However,
grid detection thereafter is carried out independently.
Limitations
D Setting a coordinate
system
D Externally–requested
deceleration, interlock,
and machine lock
D Pitch error
compensation
D Manual absolute
D Synchronization error
check using positional
deviation
D Synchronization error
check using machine
coordinates
D Synchronization
D Compensation for
out–of–synchronism
D Manual reference
position return

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