
FANUC AC SPINDLE MOTOR a series
1. ADJUSTMENT
B–65160E/02
12
(vi) The polarity of the speed command can be specified by SSIN
(input signal ) as follows:
0: The polarity is determined by parameter Nos. 3706#7
and 3706#6, and M03 and M04.
1: The polarity is determined by the SGN (input signal) .
(vii) For constant surface-speed control, the spindle speed is
calculated in min
-1
from G96, Sxxxxx (m/min.) and the
position on the X axis, then steps (iii) to (v) are performed.
(viii)
*
SSTP (input signal): Spindle stop signal
0: S0 is always output regardless of the command.
1: Normal processing steps (iii) and (iv) are performed.
(b) M series (machining center)
(i) In the T series, the gear selection signals are input signals. In
the M series, they are output signals. In the T series, one of
four gear stages is selected by two bits. In the M series, one
of three gear signals GR10, GR20, and GR30, and the SF
signal (to indicate the change of the gear signal) are output.
Spindle speed command offset compensation parameter
No. 3731=0
Spindle speed command gain parameter No. 3730=1000
Gear Maximum spindle speed (spindle speed when the
maximum motor speed is specified)
GR1O Parameter No. 3741
GR2O Parameter No. 3742
GR3O Parameter No. 3743
––––– Parameter No. 3744
When M series gear shift is used, parameter No. 3744
becomes valid.
The parameter is valid when the constant surface speed
control function is used in the M series.
To clamp the maximum spindle speed command, normally
set parameter No. 3736 to 4095 (to output up to 10 V).
To clamp the minimum spindle speed command, normally
set parameter No. 3735 to 0.
For type B gear change, the motor speed at gear change must
be set in the following parameters:
Parameter No. 3751
(for the maximum motor speed with gear 1)
Parameter No. 3752
(for the maximum motor speed with gear 2)
(ii) Sxxxxx is specified in min
-1
by the program or with the MDI.
(iii)In reply to the S command, the CNC outputs SF and either
GR1O, GR2O, or GR3O. At the same time, by using the
maximum spindle speed (min
-1
) set in the corresponding
parameter to the set gear, the CNC calculates speed command
data. The maximum spindle speed is assumed to be 4096.
The calculated data is then output to output signal: F36
(R08O to R01O) and F37 (R12O to R09O).
(iv) According to the SIND (input signal) state, the spindle speed
data is transferred to the aseries (Serial) spindle.
0: Based on the data calculated in (iii), the maximum
spindle speed is converted to "16384, then it is
transferred to the aseries (Serial) spindle.