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4 APPLICABLE FUNCTIONS
4.7 Speed limit
107
4
4.7
Speed limit
During torque mode, this function serves to limit the servo motor speed in order not to generate excessive speed.
• Speed limit can be used only in torque mode.
• When [Velocity limit value (Obj. 2D20h)] is mapped to cyclic communication, values written from
engineering tools are overwritten from the controller.
Precautions
• When the servo motor speed reaches the speed limit value, torque control may become unstable.
Setting method
Set the maximum speed to [Pr. PT67 Speed limit]. The speed limit direction and torque command direction are the same
direction. There is no speed limit in the torque command direction and the opposite direction. [Pr. PT67] is used for [Velocity
limit value (Obj. 2D20h)].
If [Pr. PT01.1 Speed/acceleration/deceleration unit selection] is set to "1" (command unit/s), set the maximum speed in [Pr.
PV21 Speed limit - Extension setting].
Status check of limiting speed
When the servo motor speed reaches the speed set in [Pr. PT67 Speed limit], VLC (Limiting speed) and Bit 4 (S_VLC) of
[Status DO2 (Obj. 2D12h)] will turn on.
4.8
Infinite feed function
To use the infinite feed function with a Mitsubishi Electric controller in the cyclic synchronous mode, set [Pr. PC29.5 [AL. 0E3.1
Absolute position counter warning] selection] to disabled.
Servo parameter
Symbol
Name
Outline
PT67
VLMT
Speed limit
Set the maximum speed for the torque mode.
Initial value: 3000.00 [r/min]
Servo parameter
Symbol
Name
Outline
PV21
VLMTE
Speed limit - Extension setting
Set the maximum speed for the torque mode.
Initial value: 2147483647 [command unit/s]
Содержание MR-JET
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