9 MAJOR POSITIONING CONTROL

MELSEC-Q

Current feed value during position-speed switching control

The following table shows the "

Md.20

Current feed value" during position-speed

switching control corresponding to the " control" settings.

Pr.21

Current feed value during speed

"

Pr.21

Current feed value during

 

 

 

 

Md.20

Current feed value

 

speed control" setting

 

 

 

 

 

 

 

 

 

 

 

 

The current feed value is updated during position control,

0:Do not update current feed value and the current feed value at the time of switching is maintained as soon as position control is switched to

 

speed control.

1: Update current feed value

The current feed value is updated during position control

and speed control.

 

 

 

 

The current feed value is updated from 0 at a control start,

2: Zero clear current feed value

and the current feed value is cleared (to "0") as soon as

 

position control is switched to speed control.

 

 

Speed

Position control

Speed control

 

 

t

 

Updated

Maintained

Speed

Position control

Speed control

 

 

t

 

Updated

Speed

Position control

Speed control

 

 

t

Updated from 0

0

 

 

 

(a) Current feed value not updated

(b) Current feed value updated

(c) Current feed value zero cleared

Switching time from position control to speed control

There is 1ms from the time the position-speed switching signal is turned ON to the

time the position-speed switching latch flag (

Md.31

Status: b5) turns ON.

 

ON

Position-speed switching signal

OFF

 

 

ON

Position-speed switching latch flag

OFF

 

1ms

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Image 401
Mitsubishi Electronics QD75D Current feed value during position-speed switching control, Current feed value during speed