
B–64113EN–1/01
9. SPINDLE SPEED FUNCTION
685
D Constant surface speed control can be executed in synchronization
control even while a workpiece is being held with the two spindles.
However, if the speed is to change in excess of the specified time
constant, the speed changes within the extent specified by time
constant.
D The maximum speed in synchronization control is determined by the
maximum speed of the spindle motor of master spindle (parameter No.
4020).
(Example) Maximum speed of the spindle motor of tool post 1: 6000
min
–1
Maximum speed of the spindle motor of tool post 2: 4500
min
–1
In the example above, a maximum spindle speed of 6,000 min
–1
is
specified for a spindle of tool post 1, although a spindle–speed command
can specify up to 12 bits, 4096. If 6,000 min
–1
is specified while
synchronous control is specified, an overspeed alarm is issued for a
spindle of tool post 2. Therefore, do not specify a value of more than
4,500 min
–1
in this case.
D Like the conventional spindle speed (S) command for which 4 or 5
digits are issued for the first spindle, the signal for specifying spindle
speed can be generated when spindle synchronization control or
synchronous control of spindle phase are in the process of being put
into effect. The SIND, SSIN SSGN, R01l to R12l, *SSTP, and SOR
signals are effective as usual.
However, in the usual mode of spindle rotation control, spindle speed
can be controlled by the PMC function when the following conditions
are satisfied: The SIND signal is set to 1 and the SSIN, SSGN, and
R01l to R12l signals are provided. When spindle synchronization
control is in the process of being put into effect, something other than
the R01l to R12l signals is required to control the spindle speed in
synchronization. The maximum spindle gear speed must be properly
set in parameters No. 3741, 3742, 3743 and 3744. When the value set
in the parameter corresponding to the selected gear is 0, the rotations
of the spindles are not synchronized even if a command is entered in
the R01I to R12I signals.
D The S command for the master spindle and the PMC control signal for
spindle control become effective when issued before spindle
synchronization control or synchronous control of spindle phase are
put into effect. The S command issued in synchronization control
becomes effective for the first spindle immediately after
synchronization control is canceled.
D The load may change due to cutting (or threading). When the load
changes in spindle synchronization control, the spindle speed may
change and the signal indicating that the synchronous control of
spindle speed is completed may go off temporarily.
D Parameters No. 4800 #0 (for the master spindle) and #1 (for the slave
spindle) are used to set the direction of rotation of the first spindle and
second spindle, respectively.
D The gear ratio of the spindle to the position coder must be set to
one–to–one.