ProNet series AC servo system User’s manual V.1.08
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4.9 Limiting Torque
The servodrive provides the following three methods for limiting output torque to protect the machine.
4.9.1 Internal Torque Limit
Maximum torque is always limited to the values set in the following parameters.
NO.
NO.
NO.
NO.
Limiting
Limiting
Limiting
Limiting Method
Method
Method
Method
Reference
Reference
Reference
Reference Section
Section
Section
Section
1
Internal torque limit
4.9.1
2
External torque limit
4.9.2
3
Torque limiting by analog voltage reference
4.9.3
Pn401
Forward Torque Limit
Setting
Setting
Setting
Setting Range
Range
Range
Range
Setting
Setting
Setting
Setting Unit
Unit
Unit
Unit
Factory
Factory
Factory
Factory Seeting
Seeting
Seeting
Seeting
Setting
Setting
Setting
Setting Validation
Validation
Validation
Validation
0
~
300
1%
300
Immediately
Pn402
Reverse Torque Limit
Setting
Setting
Setting
Setting Range
Range
Range
Range
Setting
Setting
Setting
Setting Unit
Unit
Unit
Unit
Factory
Factory
Factory
Factory Seeting
Seeting
Seeting
Seeting
Setting
Setting
Setting
Setting Validation
Validation
Validation
Validation
0
~
300
1%
300
Immediately
The settings in these parameters are constantly enabled. The setting unit is a percentage of rated
torque.
The maximum torque of the servomotor is used, even though the torque limit is set higher than the
maximum torque of the servomotor. (as is the case with the 300% factory setting)
tttt
Spe e d
Spe e d
Spe e d
Spe e d
M aximum torque
M aximum torque
M aximum torque
M aximum torque
tttt
Spe e d
Spe e d
Spe e d
Spe e d
Limiting torque
Limiting torque
Limiting torque
Limiting torque
P n
P n
P n
P n 4 0 2
4 0 2
4 0 2
4 0 2
P n
P n
P n
P n 4 0 1
4 0 1
4 0 1
4 0 1
With No Internal Torque Limit
With No Internal Torque Limit
With No Internal Torque Limit
With No Internal Torque Limit
(
M aximum torque can be output
M aximum torque can be output
M aximum torque can be output
M aximum torque can be output
)
With Internal Torque Limit
With Internal Torque Limit
With Internal Torque Limit
With Internal Torque Limit
■Note:
Too small a torque limit setting will result in insufficient torque during acceleration and deceleration.
Position
Torque
Speed
Position
Torque
Speed