Speed Limit [A]; Setting Method - Mitsubishi Electric MR-J5 Series User Manual

4.10

Speed limit [A]

During torque mode, the function serves to limit the servo motor speed in order not to generate excessive speed.
• Speed limit can be used only in torque mode.
Precautions
• When the servo motor speed reaches the speed limit value, torque control may become unstable.

Setting method

Speed limit value and motor speed
The speed is limited to the values set with [Pr. PC05 Internal speed 1] to [Pr. PC11 Internal speed 7] or the value set in the
applied voltage of VLA (Analog speed limit). The relation between the applied voltage in VLA (Analog speed limit) and the
servo motor speed is shown below. 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.
Servo motor speed [r/min]
Rated speed [r/min]
0 +10/-10
VLA applied voltage [V]
The following table indicates the limit direction according to the combination of RS1 (Forward rotation selection) and RS2
(Reverse rotation selection).
*1
Input device TC (Analog torque command)
RS1 RS2
Voltage
polarity
1 0 +
-
0 1 +
-
*1 0: off, 1: on
Forward rotation (CCW)
Speed limit direction
VLA (Analog speed limit)
Torque command +
direction
CCW or positive direction CCW or positive
direction
CW or negative direction CW or negative
direction
CCW or positive direction CW or negative
direction
CW or negative direction CCW or positive
direction
Reverse rotation (CW)
-
CCW or positive direction
CW or negative direction
CW or negative direction
CCW or positive direction
4 APPLICABLE FUNCTION
4.10 Speed limit [A]
4
Internal speed
limit
CCW or positive
direction
CW or negative
direction
CW or negative
direction
CCW or positive
direction
211