Machine Protection
6-
43
Setting the Torque Limit in Parameters
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.
Set the Torque Limit Value Using an Analog Input
You can change the analog input level torque limit value by setting the torque limit in multi-function analog
input terminals A2 and A3.
The analog input terminal signal level is factory-set as follows:
Multi-function analog input terminal A2: 4 to 20mA
Multi-function analog input terminal A3: 0 to 10
The following diagram shows the relationship between the torque limits.
Fig 6.35 Torque Limit by Analog Input
Setting Torque Limits Using Parameters and an Analog Input
The following block diagram shows the relationship between torque limit using parameters and torque limit
using an analog input.
Fig 6.36 Torque Limit Using Parameters and an Analog Input
Negative
Reverse operation
Regenerative torque limit
Regenerative torque limit
Forward torque limit
Positive/negative torque limits
Positive/negative torque limits
No. of motor rotations
Forward operation
Negative torque limit
Positive
Output torque
Multi-function analog input
Terminal
A2 or A3
Forward torque limit
(set value = 10)
Negative torque limit
(set value = 11)
Regenerative torque limit
(set value = 12)
Positive/negative torque limit
(set value = 15)
Positive forward drive
torque
Reverse positive regenerative torque
Forward negative regenerative torque
Reverse
drive
reverse
torque
Min: Minimum value priority circuit
Parame-
Forward torque limit
(L7-01)
Reverse torque limit
(L7-02)
Forward regenerative torque
limit (L7-03)
Reverse regenerative torque
limit (L7-04)
175% of Drive rated current
Forward torque limit
Reverse torque limit
Forward regenerative
torque limit
Reverse regenerative
torque limit
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