Limiting Motor Torque (Torque Limit Function) - YASKAWA Varispeed G7 Instruction Manual

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
L7-01
L7-02
L7-03
L7-04
L7-06
L7-07
-46
6
Name
Description
Display
Forward
drive
torque limit
Torq Limit
Fwd
Reverse
Sets the torque limit value as a percent-
drive
age of the motor rated torque.
torque limit
Four individual regions can be set.
Torq Limit
Rev
Output torque
Forward
regenera-
Regenerative
tive torque
Reverse
state
limit
Torq Lmt
Negative torque
Fwd Rgn
Reverse
regenera-
tive torque
limit
Torq Lmt
Rev Rgn
Integral
Set the integral time for the torque limit.
time set-
When integral control is set for the
ting for
torque limit, reduce this setting to
torque limit
increase the change in frequency for the
torque limit.
Torq Limit
*Normally handled with PRG: 103
Time
Control
method
Select the control method for the torque
selection
limit during acceleration and decelera-
for torque
tion.
limit during
0: Proportional control (integral control
accelera-
during constant speed)
tion and
1: Integral control
decelera-
Normally, this constant does not need to
tion
be set.
*Normally handled with PRG: 103
Torque
Limit Sel
Setting Factory
Range Setting
0 to
200%
300
0 to
200%
300
Positive torque
No. of
motor
rotations
0 to
200%
Forward
300
Regenerative
state
0 to
200%
300
5 to 200
10,000 ms
.
0, 1 0
.
Control Methods
Change
Open
during
V/f Flux
Loop
Opera-
V/f with Vec-
Vector
tion
PG tor
1
No No No A A
No No No A A
No No No A A
No No No A A
No No No A No
No No No A No
MEMO
Open
BUS
Loop
Regis-
Vec-
ter
tor
2
A 4A7H
A 4A8H
A 4A9H
A 4AAH
No 4ACH
No 4C9H