9 MAJOR POSITIONING CONTROL

MELSEC-Q

Current feed value during 1-axis speed control

The following table shows the " Md.20 Current feed value" during 1-axis speed

control corresponding to the " Pr.21 Current feed value during speed control" settings.

"

 

Current feed value during speed

 

 

 

 

Pr.21

 

 

 

 

 

Md.20

Current feed value

 

 

control" setting

 

 

 

 

 

 

 

 

 

 

 

 

0: Do not update current feed value

The current feed value at speed control start

is maintained.

 

 

 

1: Update current feed value

The current feed value is updated.

2: Zero clear current feed value

The current feed value is fixed at 0.

 

Speed

In speed control

 

t

Current feed value during speed control start is maintained

Speed

In speed control

Speed

In speed control

 

t

 

t

 

Current feed value is updated

 

0

(a) Current feed value not updated

(b) Current feed value updated

(c) Current feed value zero cleared

Restrictions

(1) Set "Positioning complete" in "

Da.1

Operation pattern". An axis error

"Continuous path control not possible (error code: 516)" will occur and the operation cannot start if "continuous positioning control" or "continuous path

control" is set in "

Da.1

Operation pattern".

("Continuous positioning control" and "continuous path control" cannot be set in speed control.)

(2) Set the WITH mode in "

Pr.18

M code ON signal output timing" when using

an M code. The M code will not be output, and the M code ON signal will not turn ON if the AFTER mode is set.

(3) An error "No command speed" (error code: 503) will occur if the current speed

(-1) is set in "

Da.8

command speed".

(4)The software stroke limit check will not carried out if the control unit is set to "degree".

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Image 368
Mitsubishi Electronics QD75P, QD75D Current feed value during 1-axis speed control, Set Positioning complete, Pr.18