
B–65160E/02
2. FUNCTION EXPLANATION
FANUC AC SPINDLE MOTOR a series
149
16i/16 #7 #6 #5 #4 #3 #2 #1 #0015i15
SDTCHG
6519 3019 3019 4019
6659 3159
1st–
2nd–
Standard setting: 0 0 0 0 0 0 0 0
SDTCHG:
Specifies whether to switch from the high-speed to low-speed range in
speed range switching at the speed detection level (SDT = 1) or lower
0: Switches from the high-speed to low-speed range regardless of the
speed detection signal (SDT).
1: Switches from the high-speed to low-speed range at the speed
detection signal SDT = 1.
When this bit is set to 0, switching from the high–speed to low–speed
characteristics is performed, regardless of the state of the speed detection
signal (SDT).
When this bit is set to 1, switching from the high–speed to low–speed
characteristics is not performed if the speed detection signal (SDT) is set
to 0; switching takes place once the speed detection signal (SDT) is set
to 1.
To ensure that switching to the low–speed characteristics is performed
near the switching speed, set a speed detection level (in parameter No.
4023) that is slightly higher then the switching speed level.
16i/1601515i
Speed detecting level
6523 3023 3023 4023
6663 3163
1st–
2nd–
Data unit : 0.1%
Data range : 0 to 1000 (0 to 100%)
Standard setting : 0
This data is used to set the detecting range of speed detecting signal
(SDT).
When the motor speed reaches (setting data/10) % or less of maximum
speed, the bit of speed arrival signal (SDT) is set to ”1”.
16i/1601515i
Speed detection level hysteresis
6924 3304 3160 4160
6964 3524
1st–
2nd–
Data unit : 1 min
–1
(when parameter No. 4006 #2 (SPDUNT) = 1, 10 min
–1
)
Data range : 0 to 32767
Standard setting : 0
Set the detection level hysteresis of the speed detection signal (SDTA).
The state of the speed detection signal (SDTA) changes from 1 to 0 at a
motor speed of (detection level + hysteresis), and from 0 to 1 at a specified
(detection level).
When 20 min
–1
or less is set in this parameter, a hysteresis of 20 min
–1
is set automatically.