Speed Limit [G] [Wg]; Setting Method; Checking "Limiting Speed" Status - Mitsubishi Electric MELSERVO-J5 MR-J5 Series User Manual

4.11

Speed limit [G] [WG]

During the 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 the 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)].
Servo Symbol
parameter
PT67 VLMT
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].
Servo Symbol
parameter
*1
PV21 VLMTE
*1 Available on servo amplifiers with firmware version A5 or later.

Checking "Limiting speed" status

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 APPLICABLE FUNCTIONS
268
4.11 Speed limit [G] [WG]
Name
Speed limit
Name
Speed limit extension setting
Outline
Set the maximum speed for the torque mode.
Initial value: 3000.00 [r/min], [mm/s]
Outline
Set the maximum speed for the torque mode.
Initial value: 2147483647 [command unit/s]