Mitsubishi MELSEC-Q QD77MS, User Manual

Page: 708 / 976

13 - 49
Chapter 13 Control Sub Functions
13.5.2 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 "
Cd.13 Positioning operation speed override".
[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 " Md.22
Feedrate".
2) If " Cd.13 Positioning operation speed override" is set to 100%, the speed
will not change.
3) If "
Cd.13
Positioning operation speed override" is set a value less than
100%, the warning "Less than minimum speed (warning code: 110)" is
generated, and control will be carried out at speed unit "1" at the time
"
Md.22 Feedrate" becomes a value of "1" or less.
4) If there is not enough remaining distance to change the speed due to the
"override function", when the speed is changed during the position control of
speed-position switching control or position-speed switching 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.8
Speed limit value", a warning "Speed limit value over (warning code: 501)"
will occur and the speed will be controlled at the "
Pr.8 Speed limit value".
The "
Md.39
In speed limit flag" will turn ON.
Cd. 13
Da. 8 Command speed
Md. 22 Feedrate
100 1
50 150
100
200
50
50 1 25
75
50 75
Not affected by the override value
during deceleration
Not enough remaining
distance could be secured,
so operation is carried out
at an increased speed.
t
V
Positioning operation
speed override
Fig. 13.28 Override function operation