
B–63833EN–1/02
9. SPINDLE SPEED FUNCTION
514
Spindle configuration when multi-spindle control is used:
Necessary
parameter
· Multi-spindle control
· Spindle serial output
· Parameter SS2 (No. 3701#4) = 1
(to use second spindle)
· Spindle analog output (to use third spindle)
Connection of
each spindle
First spindle → Connect on JA41
(JA7B) (CNC main CPU board).
Second spindle → Connect on JA7A
(JA7B) (first spindle control unit).
Third spindle → Connect on JA40
(CNC main CPU board).
Connection of
each position
coder
First position coder: Feedback information obtained by posi-
tion coder or equivalent sensor connected to first spindle con-
trol unit is fed to CNC via serial interface.
Second position coder: Feedback information obtained by
position coder or equivalent sensor connected to second
spindle control unit is fed to CNC via serial interface through
1st spindle control unit
Note) When second spindle is not connected, second posi-
tion coder cannot be used.
For detailed information about serial spindle connection, refer to the
manuals on the serial spindles.
The control function for keeping the surface speed constant can be used
with any of the three spindles, if the spindle speed is within the range
allowable for this function. When the position coder is required, it can
be installed on the 1st and 2nd spindle. The spindle selection signal (SWS
1–3) for the spindle must stay set at “1” during machining using this
function.
If multi–spindle control is combined, multiple position coders can be
selected. To carry out spindle speed fluctuation detection, select the first
spindle (first position coder). Monitor the states of the second position
coder selection signal (PC2SLC) and spindle selection signals (SWS1
and SWS2). The spindle speed fluctuation detection cannot be executed
with the second position coder.
The actual spindle speed output function conveys speed information
obtained from the position coder specified by the second position coder
selection signal (PC2SLC) to the PMC.
When the parameter HSO (No. 3709#5)=1, the difference of the feedback
pulses between the 1st and 2nd position coder can be output irrespective
of the state of 2nd position coder selection signal (PC2SLC).
Connection of spindle
Relationship with other
functions
D Constant surface speed
control
D Spindle speed
fluctuation detection
D Actual spindle speed
output