Mitsubishi Electric QD77MS User Manual page 556

"[Pr.21] Current feed value during
speed control" setting
0: Do not update current feed value
1: Update current feed value
2: Zero clear current feed value
V
Speed control
Current
Maintained
feed value
(a) Current feed value not updated
Current feed value during speed-position switching control (INC mode)
The following table shows the "[Md.20] Current feed value" during speed-position
switching control (INC mode) corresponding to the "[Pr.21] Current feed value
during speed control" settings.
Position control
t
Current
Updated
feed value
(b) Current feed value updated
Switching time from speed control to position control
There is 1ms from the time the speed-position switching signal is turned ON to the
time the speed-position switching latch flag ([Md.31] Status: b1) turns ON.
Speed-position switching signal
Speed-position switching latch flag
Speed-position switching signal setting
(1) The following table shows the items that must be set to use the external
command signals [DI] as speed-position switching signals.
Setting item
External
[Pr.42] command
function selection
External
[Cd.8]
command valid
Speed-position
[Cd.45] switching device
selection
(Note): Set the external command signal [DI] in "[Pr.95] External command signal selection" at QD77MS16
use. Refer to Section 5.2 "List of parameters" and Section 5.7 "List of control data" for information
on the setting details.
[Md.20] Current feed value
The current feed value at control start is maintained during speed
control, and updated from the switching to position control.
The current feed value is updated during speed control and position
control.
The current feed value is cleared (set to "0") at control start, and
updated from the switching to position control.
V
Speed control
Position control
Updated
ON
OFF
OFF
Setting
Setting details
value
Speed-position, position-speed
2
switching request.
Validates an external
1
command.
Use the external command
0 signal for switching from speed
control to position control.
9 - 98
Chapter 9 Major Positioning Control
V
Speed control
t
Current
0
feed value
(c) Current feed value zero cleared
ON
1ms
Buffer memory address
QD77MS2
QD77MS4
1505+100n
1566+100n
Position control
t
Updated from 0
QD77MS16
62+150n
4305+100n
4366+100n