Functions To Change The Control Details; Speed Change Function - Mitsubishi Electric QD77MS User Manual

13.5 Functions to change the control details

13.5.1 Speed change function

Functions to change the control details include the "speed change function", "override
function", "acceleration/deceleration time change function", "torque change function"
and "target position change function". Each function is executed by parameter setting
or sequence program creation and writing.
Refer to Section 3.2.5 "Combination of QD77MS main functions and sub functions" for
combination with main function.
Both the "speed change function" or "override function" change the speed, but the
differences between the functions are shown below. Use the function that corresponds
to the application.
"Speed change function"

The speed is changed at any time, only in the control being executed.
 The new speed is directly set.
"Override function"

The speed is changed for all control to be executed.
 The new speed is set as a percent (%) of the command speed.
POINT
"Speed change function" and "Override function" cannot be used in the manual
pulse generator operation and speed-torque control.
The speed control function is used to change the speed during control to a newly
designated speed at any time.
The new speed is directly set in the buffer memory, and the speed is changed by a
speed change command ([Cd.15] Speed change request) or external command signal.
During the machine OPR, a speed change to the creep speed cannot be carried out
after deceleration start because the near point dog ON is detected. When the speed
change function is enabled and the speed is slower than the creep speed, the speed
change is disabled and the speed accelerates to the creep speed after the near point
dog ON is detected.
The details shown below explain about the "speed change function".
[1] Control details
[2] Precautions during control
[3] Setting the speed change function from the PLC CPU
[4] Setting the speed change function using an external command signal
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Chapter 13 Control Sub Functions