Machine Protection
6-
41
Limiting Motor Torque (Torque Limit Function)
The motor torque limit function is enabled only with open-loop torque control.
In the open-loop vector control method, the user-set value is applied to the torque limit by calculating inter-
nally 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
Multi-function Analog Input (H3-05, H3-09)
Note The forward torque limit is the limit value when the analog input signal generates forward torque. This torque limit setting is enabled even when the
analog input signal generates forward torque while the motor is operating (regeneration).
Setting the Torque Limit in Constants
Using L7-01 to L7-04, you can set individually four torque limits in the following directions: Forward drive,
reverse drive, forward regeneration, and reverse regeneration.
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vector
2
L7-01
Forward
drive torque
limit
Sets the torque limit value as a percentage
of the motor rated torque.
Four individual regions can be set.
0 to 300
200%
No
No
No
A
A
A
Torq Limit
Fwd
L7-02
Reverse
drive torque
limit
0 to 300
200%
No
No
No
A
A
A
Torq Limit
Rev
L7-03
Forward
regenerative
torque limit
0 to 300
200%
No
No
No
A
A
A
Torq Lmt
Fwd Rgn
L7-04
Reverse
regenerative
torque limit
0 to 300
200%
No
No
No
A
A
A
Torq Lmt
Rev Rgn
Set-
ting
Value
Function
Contents (100%)
Control Methods
V/f
V/f
with
PG
Open
Loop
Vec-
tor
1
Flux
Vec-
tor
Open
Loop
Vec-
tor
2
10
Positive torque limit
Motor's rated torque
No
No
Yes
Yes
Yes
11
Negative torque limit
Motor's rated torque
No
No
Yes
Yes
Yes
12
Regenerative torque limit
Motor's rated torque
No
No
Yes
Yes
Yes
15
Positive/negative torque limit
Motor's rated torque
No
No
Yes
Yes
Yes
Output torque
Positive torque
Reverse
Negative torque
No. of
motor
rotations
Regenerative
state
Regenerative
state
Forward
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