
B–65160E/02
2. FUNCTION EXPLANATION
FANUC AC SPINDLE MOTOR a series
143
phase is completed is output when the difference between the error
pulses of the two spindles does not exceed the number of pulses
specified in parameter 303 of the NC function.
The positions of spindle phase synchronization for both spindles one
and two can be specified in spindle parameter 6534.
The two spindles are not synchronized when synchronization control
of spindle phase is in progress (until the signal indicating that the
synchronization control of spindle phase is completed is set to 1).
The command for spindle phase synchronization must not be issued
while a workpiece is being held with the two spindles.
If it is issued, synchronization control of spindle phase is started
automatically.
(2) PMC signal, SYCAL is provided to monitor a synchronization errors
between spindles for which spindle synchronization control or
synchronization control of spindle phase is in effect. The
synchronization error between the two spindles is always monitored.
The SYCAL signal is set to 1 when the error (the absolute value of
the error pulse) specified in parameter 576 of tool post one is
exceeded, and set to 0 when not exceeded.
(3) When generated while spindle synchronization control or
synchronization control of spindle phase is in the process of being put
into effect, the signal specifying the speed is used as the signal for
specifying the synchronization speed.
The signal depends on information specified at addresses G124 and
G125 by PMC. 0TTC cannot use the four or five digit spindle speed
(S) command.
However, it can use the function of the 4 or 5 digit S command via
PMC by using the S 12-bit information output at addresses F172 and
F173.
With this function, constant surface speed control can be executed in
synchronization control even while a workpiece is being held with the
two spindles.
However, the time constant specified in the parameter is not exceeded
even if a larger speed increment is specified.
(4) The maximum speed in synchronization control is determined by the
maximum speed of the spindle motor of HEAD 1 (parameter 6520).
[Example] Maximum speed of the spindle motor of HEAD 1
: 6000 min
–1
Maximum speed of the spindle motor of HEAD 2
: 4500 min
–1
However the maximum speed during synchronization control is
limited by the maximum speed of HEAD 2. In the example above,
the maximum speed that can be specified by the 12-bit speed
command is 6000 min
–1
for HEAD 1. However, if 6000 min
–1
is
specified in synchronization control, an overspeed alarm is issued
from HEAD 2.
The spindle speed specified by the command must not exceed 4500
min
–1
.
(5) When the spindles are controlled by PMC in the usual spindle control
mode, the SIND signal needs to be set to 1. In synchronization control
mode, the spindles are controlled according to the synchronization
speed specified by the SSGN and R01I to R12I signals. Control does
not depend on the states of the usual spindle control signals, *SSTP,
SOR, SIND, and SSIN.
However, settings other than signals R01I to R12I are required to
specify synchronization of spindle speed.
The maximum spindle gear speed must be properly set in parameters