YASKAWA Varispeed G7 Series, Instruction Manual, Page: 280 / 541

Machine Protection
6-
47

Limiting Motor Torque (Torque Limit Function)
The motor torque limit function is enabled with flux vector control and open-loop vector control.
In the open-loop vector control and flux vector control, the user-set value is applied to the torque limit by cal-
culating internally the torque output by the motor. Enable this function if you do not want a torque above a
specified amount to be applied to the load, or if you do not want a regeneration value above a specified
amount to occur.
 Related Constants
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO
BUS
Regis-
ter
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vec-
tor
2
L7-01
Forward
drive
torque limit
Sets the torque limit value as a percent-
age of the motor rated torque.
Four individual regions can be set.
0 to
300
200% No No No A A A 4A7H
Torq Limit
Fwd
L7-02
Reverse
drive
torque limit
0 to
300
200% No No No A A A 4A8H
Torq Limit
Rev
L7-03
Forward
regenera-
tive torque
limit
0 to
300
200% No No No A A A 4A9H
Torq Lmt
Fwd Rgn
L7-04
Reverse
regenera-
tive torque
limit
0 to
300
200% No No No A A A 4AAH
Torq Lmt
Rev Rgn
L7-06
Integral
time set-
ting for
torque limit
Set the integral time for the torque limit.
When integral control is set for the
torque limit, reduce this setting to
increase the change in frequency for the
torque limit.
*Normally handled with PRG 103 
.
5 to
10,000
200
ms
No No No A No No 4ACH
Torq Limit
Time
L7-07
Control
method
selection
for torque
limit during
accelera-
tion and
decelera-
tion
Select the control method for the torque
limit during acceleration and decelera-
tion.
0: Proportional control (integral control
during constant speed)
1: Integral control
Normally, this constant does not need to
be set.
*Normally handled with PRG 103 
.
0, 1 0 No No No A No No 4C9H
Torque
Limit Sel
Output torque
Positive torque
Reverse
Negative torque
No. of
motor
rotations
Regenerative
state
Regenerative
state
Forward
TOE-S616-60.1.book 47 ページ ２０１７年８月４日 金曜日 午後３時４１分