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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 Parameters
Parame-
ter
Number
Forward
Torque
Limit
L7-01
Torq Limit
Fwd
Reverse
Torque
Limit
L7-02
Torq Limit
Rev
Forward
Regenera-
tive Torque
L7-03
Limit
Torq Lmt
Fwd Rgn
Reverse
Regenera-
tive Torque
L7-04
Limit
Torq Lmt
Rev Rgn
Multi-function Analog Input (H3-05, H3-09)
Setting
Value
10
Positive torque limit
11
Negative torque limit
12
Regenerative torque limit
15
Positive/negative torque limit
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).
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Name
Description
Sets the torque limit value as a percentage
of the motor rated torque. Four individual
quadrants can be set.
Output torque
Regenerative
Reverse
state
Regenerative
state
Negative torque
Function
Setting
Factory
Range
Setting
0 to 300
200%
0 to 300
200%
Positive torque
No. of
motor
rotations
0 to 300
200%
Forward
0 to 300
200%
Contents (100%)
Motor's rated torque
Motor's rated torque
Motor's rated torque
Motor's rated torque
Control Methods
Change
Open
V/f
during
Loop
Flux
V/f
with
Operation
Vector
Vector
PG
1
No
No
No
A
A
No
No
No
A
A
No
No
No
A
A
No
No
No
A
A
Control Methods
Open
V/f
Loop
Flux
V/f
with
Vector
Vector
PG
1
No
No
Yes
Yes
No
No
Yes
Yes
No
No
Yes
Yes
No
No
Yes
Yes
Open
Loop
Vector
2
A
A
A
A
Open
Loop
Vector
2
Yes
Yes
Yes
Yes
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Troubleshooting
