Mitsubishi Electric MELSEC-LD77MS2 User Manual page 739

[2] Precaution during control
(1) When changing the speed by the override function during continuous path
(2) The warning "Deceleration/stop speed change" (warning code: 500) occurs
(3) When the speed is changed by the override function during interpolation
(4) When carrying out consecutive speed changes by the override function, be
(5) When a machine OPR is performed, the speed change by the override
(6) When deceleration is started by the override function, the deceleration start
(7) The override function cannot be used during speed control mode, torque
[3] Setting the override function
The following shows the data settings and sequence program example for setting
the override value of axis 1 to "200%".
(1) Set the following data. (Use the speed change time chart shown in section
Setting item
Positioning
operation speed
Cd.13
override
: Refer to Section 5.7 "List of control data" for details on the setting details.
control, the speed change will be ignored if there is not enough distance
remaining to carry out the change.
and the speed cannot be changed by the override function in the following
cases.
(The value set in "
Cd.13
a deceleration stop.)
 During deceleration by a stop command

During automatic deceleration during positioning control
control, the required speed is set in the reference axis.
sure there is an interval between the speed changes of 100ms or more.
(If the interval between speed changes is short, the Simple Motion module
will not be able to track, and it may become impossible to carry out
commands correctly.)
function cannot be carried out after a deceleration start to the creep speed
following the detection of near-point dog ON. When the override is enabled
during OPR and the speed is changed, the override is disabled and the
speed accelerates to the creep speed after the near point dog ON is
detected.
flag does not turn ON.
control mode or continuous operation to torque control mode.
(2) below as a reference, and set using the sequence program shown in
section (3).)
Setting
value
200 Set the new speed as a percentage (%).
13 - 49
Chapter 13 Control Sub Functions
Positioning operation speed override
Setting details
" is validated after
Buffer memory address
LD77MS2
LD77MS16
LD77MS4
1513+100n 4313+100n
n: Axis No.-1