Справочник Пользователя для Mitsubishi Electronics AJ65BT-D75P2-S3
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MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
12.5.2 Override function
The override function changes the command speed by a designated percentage (1 to
300%) for all control to be executed.
The speed can be changed by setting the percentage (%) by which the speed is
changed in "Positioning operation speed override (RWwm+1, RWwm+9)".
For a machine zero point return, however, override cannot be performed after start of
deceleration to the creep speed following the detection of Near-point dog ON.
(1) Control details
(2) Precautions during control
(3) Setting the override function
300%) for all control to be executed.
The speed can be changed by setting the percentage (%) by which the speed is
changed in "Positioning operation speed override (RWwm+1, RWwm+9)".
For a machine zero point return, however, override cannot be performed after start of
deceleration to the creep speed following the detection of Near-point dog ON.
(1) Control details
(2) Precautions during control
(3) Setting the override function
(1) Control details
The following shows that operation of the override function.
1) A value changed by the override function is monitored by "Feedrate
(RWrn+2 to 3, RWrn+10 to 11)".
2) If "Positioning operation speed override (RWwm+1, RWwm+9)" is set to
100%, the speed will not change.
3) If "Positioning operation speed override (RWwm+1, RWwm+9)" is set a
value less than 100%, control will be carried out at speed unit "1" at the time
"Feedrate (RWrn+2 to 3, RWrn+10 to 11)" becomes a value of "1" or less.
"Feedrate (RWrn+2 to 3, RWrn+10 to 11)" becomes a value of "1" or less.
4) If there is not enough remaining distance to change the speed when the
speed is changed during the position control of speed/position changeover
control, the operation will be carried out at the speed that could be changed.
control, the operation will be carried out at the speed that could be changed.
5) If the speed changed by the "override function" is greater than the "
Pr.7
Speed limit value", a warning "speed limit value over" (warning code: 501)
will occur and the speed will be controlled at the " Pr.7 Speed limit value".
The "Speed limitting flag (RX(n+1)0, RX(n+4)0)" will turn ON.
will occur and the speed will be controlled at the " Pr.7 Speed limit value".
The "Speed limitting flag (RX(n+1)0, RX(n+4)0)" will turn ON.
Feedrate
Da. 7 Command speed
100
1
50
150
100
200
50
50
1
25
75
50
75
Not affected by the override value
during deceleration
during deceleration
Not enough remaining
distance could be secured,
so operation is carried out
at an increased speed.
distance could be secured,
so operation is carried out
at an increased speed.
t
V
Positioning operation
speed override
speed override
[RWrn+2 to 3,
RWrn+10 to 11]
RWrn+10 to 11]
[RWwm+1, RWwm+9]
Fig. 12.27 Override function operation