
B–63833EN–1/02
9. SPINDLE SPEED FUNCTION
531
NOTE
This table show an example of three gears. For the basic
spindle motor speed, refer to the spindle motor description
manual. “+ α” means that the spindle motor speed may
slightly exceed the basic spindle motor speed.
If the M type gear selection method is used, use gear change method B
(bit 3 (SGT) of parameter No. 3705 = 1) in the tapping cycle to specify
the following:
The table above shows the maximum low-speed gear speed during rigid
tapping for low-/medium-speed gear change position D (parameter No.
3761).
The table above shows the maximum medium-speed gear speed during
rigid tapping for medium-/high-speed gear change position E (parameter
No. 3762).
If the T type gear selection method is used, add the rigid tapping logic to
the logic programmed in the PMC.
See Section 9.3, “Spindle Control” for details of the spindle gear change
specifications.
The loop gain can be specified for each gear. Specify “0” for parameter
No. 5280 and specify loop gains for each gear for parameter Nos. 5281
to 5284. Unless “0” is specified for parameter No. 5280, the loop gains
for each gear are disabled, and the loop gain common to all gears, the
value of parameter No. 5280, is enabled.
Specify the time constant and the maximum spindle speed for each gear.
Use parameters Nos. 5261 to 5264 to specify the time constant.
Use parameters Nos. 5241 to 5244 to specify the maximum spindle speed.
For M type gear selection method, set the maximum spindle speed to
parameter No. 5243, irrespective of the number of gear stages used.
Setting bit 2 (TDR) of parameter No. 5201 to “1” enables setting of the
time constants used during extraction for each gear set. Specify the
extraction time constant for each gear in parameter Nos. 5271 to 5274.
If bit 1 (VGR) of parameter No. 5200 is set to “1”, the gear ratio for the
spindle and position coder can be set to anywhere between 1:32767 and
32767:1 in one-increment units for three gear sets with 1st spindle of M
series, four gear sets with 1st spindle of T series, or two gear sets with 2nd
spindle. However 1:8 to 8:1 is the recommended value.