4 APPLICABLE FUNCTIONS
4.9 Torque limit [G] [WG]
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4.9
Torque limit [G] [WG]
The torque limit function limits the torque generated by the servo motor.
The following torque limit can be set.
• When setting the torque above the maximum torque of the servo motor, the torque is limited by the
maximum torque of the servo motor.
• Servo parameters that are mapped to an object from the controller will overwrite those written from the
engineering tool.
Precautions
• If the torque limit is canceled during servo-lock, the servo motor may suddenly rotate, depending on the amount of the
position deviation from the command position.
• When using the torque limit, check that [Pr. PB06 Load to motor inertia ratio/load to motor mass ratio] is set properly.
Improper settings may cause an unexpected operation such as an overshoot.
• When "0.0" is set, no torque or thrust is generated.
Setting method
Servo parameter setting
The maximum torque is always limited by the values of [Pr. PA11 Forward rotation torque limit] and [Pr. PA12 Reverse rotation
torque limit] during operation.
Set servo parameters in relation to the rated torque or continuous thrust as 100.0 [%].
Item
Outline
Internal torque limit
The maximum torque is limited by the values of [Pr. PA11 Forward rotation torque limit] and [Pr.
PA12 Reverse rotation torque limit].
Maximum torque limit 1
The maximum torque is limited by the value of [Max torque (Obj. 6072h)] according to the setting of
[Pr. PC78.1 Maximum torque limit 1 selection].
Servo
parameter
Symbol
Name
Outline
PA11
TLP
Forward rotation torque limit
Set the servo parameter to limit the torque of the servo motor for CCW power running
or CW regeneration, or to limit the thrust of the linear servo motor for positive
direction power running or negative direction regeneration.
PA12
TLN
Reverse rotation torque limit
Set the servo parameter to limit the torque of the servo motor for CW power running
or CCW regeneration, or to limit the thrust of the linear servo motor for positive
direction power running or negative direction regeneration.
PE53
TLMX1
Maximum torque limit 1
When [Pr. PC78.1 Maximum torque limit 1 selection] is set to "1" (enabled), the
torque generated by the servo motor can be limited with this servo parameter.
