Automatic Acceleration/Deceleration; Speed Clamp - Mitsubishi Electric MELDAS C6 Programming Manual

7. Feed Functions

7.6 Automatic acceleration/deceleration

Function and purpose
The rapid traverse and manual feed acceleration/deceleration pattern is linear acceleration and
linear deceleration.
Time constant T
500ms.
The cutting feed (not manual feed) acceleration/deceleration pattern is exponential acceleration/
deceleration. Time constant Tc can be set independently for each axis using parameters in 1ms
steps across a range from 1 to 500ms. (Normally, the same time constant is set for all axes.)
f
T
R
Rapid traverse acceleration/deceleration
Pattern
(T = Rapid traverse time constant)
R
(T = Deceleration check time)
d
With rapid traverse and manual feed, the following block is executed after the command pulse of
the present block has become "0" and the tracking error of the acceleration/deceleration circuit has
become "0". However, with cutting feed, the following block is executed as soon as the command
pulse of the present block becomes "0" although an external signal (error detect) can detect that
the tracking error of the acceleration/deceleration circuit has reached "0" and the following block
can be executed. When the in-position check has been made valid (selected by parameter "#1193
inpos") during the deceleration check, it is first confirmed that the tracking error of the
acceleration/deceleration circuit has reached "0", then it is checked that the position deviation is
less than the parameter setting value "#2204 SV024", and finally the following block is executed. It
depends on the machine as to whether the error detect function can be activated by a switch or M
function and so reference should be made to the instructions issued by the machine maker.

7.7 Speed clamp

Function and purpose
This function exercises control over the actual cutting feedrate in which override has been applied
to the cutting feedrate command so that the speed clamp value which has been preset
independently for each axis is not exceeded.
(Note) Speed clamping is not applied to synchronous feed and thread cutting.
7.6 Automatic acceleration/deceleration
can be set independently for each axis using parameters in 1ms steps from 1 to
R
With continuous
commands
t
T
R
T
d
59
f
With continuous commands
T
T
C
C
Cutting feed acceleration/deceleration
pattern
(T = Cutting feed time constant)
c
t