Optimum Speed Control - Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual

Optimum speed control

When movement direction changes at corners and arcs, the acceleration that corresponds to the change in direction and feed
speed is generated. If that acceleration is large, the machine vibrates and traces from working are left on the working surface.
In high-accuracy control mode, deceleration control (optimum speed control) is performed to keep the generated acceleration
equal to or less than the tolerable acceleration set in the parameters. With optimum speed control, cycle time increases are
kept to a minimum while controlling machine vibration, making highly accurate work possible.
The following functions are available in optimum speed control.
Function
Corner Optimum corner
deceleration deceleration
Tolerable
acceleration control
for each axis
Arc speed clamp
6 AUXILIARY AND APPLIED FUNCTIONS
228
6.7 High-Accuracy Control
Operation
θ
Deceleration control keeps the
composite acceleration from
Acceleration
exceeding the common tolerable
acceleration for each axis
Deceleration control keeps the
acceleration for each axis from
Accele- exceeding the tolerable
ration acceleration for each axis
Deceleration control keeps the
composite acceleration generated
Accele- at an arc from exceeding the commo
ration tolerable acceleration for each axis
Details
The composite acceleration that is generated at the
joints between blocks is kept equal to or lower than
the common tolerable acceleration for each axis by
deceleration control. This allows edges to be cut with
high precision.
To perform optimum corner deceleration, set the G-
code control system parameter "tolerable
acceleration control for each axis ON" to "0:
Optimum corner deceleration".
The acceleration generated for each axis at the
joints between blocks is kept equal to or lower than
the tolerable acceleration set to each axis by
deceleration control.
Tolerable acceleration control for each axis is
effective when the characteristics (acceleration) of
each axis are different. If the characteristics of each
axis are the same, the deceleration control is the
same as optimum corner deceleration.
To perform tolerable acceleration control for each
axis, set the G-code control system parameter
"tolerable acceleration control for each axis ON" to
"1: Tolerable acceleration control for each axis".
The composite acceleration that is generated at an
arc is kept equal to or lower than the common
tolerable acceleration for each axis by deceleration
control. This keeps the path deviation (arc radius
reduction) from exceeding a fixed value.