9 MAJOR POSITIONING CONTROL

MELSEC-Q

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 " during speed control" settings.

Pr.21

Current feed value

"

Pr.21

Current feed value during

 

 

 

 

Md.20

Current feed value

 

speed control" setting

 

 

 

 

 

 

 

 

 

 

 

 

The current feed value at control start is maintained during

0:Do not update current feed value speed control, and updated from the switching to position control.

1: Update current feed value

The current feed value is updated during speed control

and position control.

 

 

 

2: Zero clear current feed value

The current feed value is cleared (set to "0") at control

start, and updated from the switching to position control.

 

Speed

Speed control

Position control

 

 

t

Maintained Updated

Speed

Speed control

Position control

 

 

t

 

Updated

Speed

Speed control

Position control

 

 

t

0

 

Updated from 0

(a) Current feed value not updated

(b) Current feed value updated

(c) Current feed value zero cleared

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.

 

ON

Speed-position switching signal

OFF

 

ON

Speed-position switching latch flag

OFF

 

1ms

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Image 386
Mitsubishi Electronics QD75P, QD75D user manual Switching time from speed control to position control, Following table shows