Mitsubishi QD70P4 User Manual

11 - 1 11 - 1
MELSEC-Q
11 SUB FUNCTIONS
CHAPTER 11 SUB FUNCTIONS
This chapter details the sub functions of the QD70.
11.1 Outline of sub functions
The "sub functions" are used to limit control and add functions, for example, for
execution of OPR control, positioning control and JOG operation. These sub functions
are executed by parameter setting, sequence programs, etc.
There are the following "sub functions".
Sub functions Details
Speed limit function
If the command speed exceeds "Pr. 5
Speed limit value" during
control, this function limits the commanded speed to within the
"
Pr. 5
Speed limit value" setting range.
Speed change function
This function changes speed at any point during speed control of
speed-position switching control or during JOG operation.
Set the changed speed in the speed change buffer memory (
Cd. 7
New speed value), and change the speed with the speed change
request (
Cd. 6
Speed change request).
Software stroke limit function
If a command outside of the upper/lower limit stroke limit setting
range, set in the parameters, is issued, this function will not execute
positioning control for that command.
Acceleration/ deceleration process function
This function adjusts the acceleration/deceleration processing of
control.
Restart function
This function resumes positioning control from where it had stopped
while the axis is at a stop.
11.2 Speed limit function
The speed limit function limits the command speed to a value within the "speed limit
value" setting range when the command speed during control exceeds the "speed limit
value".
The details shown below explain about the "speed limit function".
[1] Relation between the speed limit function and various controls
[2] Setting the speed limit function
[1] Relation between the speed limit function and various controls
The following table shows the relation of the "speed limit function" and various
controls.
Control type Speed limit function Speed limit value
Machine OPR control
OPR control
Fast OPR control
Position control (1-axis linear control)
Speed-position switching control
Pr. 5
Speed limit value
Positioning control
Current value changing – Setting value invalid
JOG operation
Pr. 5
Speed limit value
: Always set
– : Setting not required (Setting value is invalid. Use the initial values or setting values within a range where no error
occurs.)
Note: If the speed during control is higher than "
Pr. 5
Speed limit value", the "Outside speed" warning (warning
code: 20) occurs and the speed is controlled at "
Pr. 5
Speed limit value".
(However, if the OPR speed or creep speed is higher than the speed limit value, an error occurs when
the PLC READY signal [Y0] turns from OFF to ON. For details, refer to "Section 4.3 List of OPR data".)
11

Mitsubishi QD70P4 Specifications

General

Brand	Mitsubishi
Model	QD70P4
Category	Controller
Language	English