
3/3Descri
tion
Design.
DateEd
01 00.01.18
Ihara Newl
desi
ned
Notice of the update of Digital
Servo Software 90A0 series
B-65150E/04-003
FANUC LTD
Attachment 1: Correction of torque control type 2
1. Outline
The following phenomenon occurs in torque control type 2. We report the correction of torque
control type 2 in this update of digital servo software.
2. Phenomenon
When the constant torque command is given by PMC with using torque control type 2, the
torque command sometimes becomes unstable, and a phenomenon like axis vibration occurs
under the following conditions.
3. Condition
If the following conditions are satisfied, the phenomenon mentioned above occurs.
(a)
Servo software from 90A0/I (09) to 90A0/U (21) is used.
(b)
Torque control type 2 is used.
No.2007#7=1 and No.2203#4=1 (FS 16
i
, 18
i
)
No.1951#7=1 and No.1743#4=1 (FS 15
i
)
(c)
Either “torque limit function during acceleration” or “compensation function for current
phase delay at deceleration” is used.
No.2211#2=1 or No.2211#1=1 (FS 16
i
, 18
i
)
No.1751#2=1 or No.1751#1=1 (FS 15
i
)
The following motors fit the condition (c) with default servo parameter. So torque control
type 2 doesn’t work normally if you use default servo parameter.
1-0SP/3000,
α
22/2000,
α
22/3000,
α
30/2000,
α
30/3000,
α
M9/3000,
α
40/FAN,
α
40/2000,
α
E3/3000,
α
E6/2000,
α
E2/3000, 2-0SP/3000,
α
1/3000,
α
M30
4. Countermeasure
Please change a servo software to 90A0/W (23) or later.