Mitsubishi Electronics QD75MH1 Manuel D’Utilisation

 
 

 

12 - 13 

MELSEC-Q

 

12   CONTROL SUB FUNCTIONS 

 

12.3.2 Electronic gear function 

The "electronic gear function" adjusts the pulses calculated and output according to the 
parameters set in the QD75MH with the actual machine movement amount.  

 

The "electronic gear function" has the following three functions ( [A] to [C] ).  

 

[A]  During machine movement, the function increments in the QD75MH values 

less than one pulse that could not be pulse output, and outputs the 
incremented amount of pulses when the total incremented value reached one 
pulse or more.  

 

[B]  When machine OPR is completed, current value changing is completed, 

speed control is started (except when current feed value change is present), or 
fixed-feed control is started, the function clears to "0" the cumulative values of 
less than one pulse which could not be output. (If the cumulative value is 
cleared, an error will occur by a cleared amount in the feed machine value.  
Control can be constantly carried out at the same machine movement amount, 
even when the fixed-feed control is continued.) 

 

[C]  The function compensates the mechanical system error of the command 

movement amount and actual movement amount by adjusting the "electronic 
gear".  
(The "movement amount per pulse" value is defined by "

Pr.2

 No. of pulses 

per rotation (AP)", "

Pr.3

 Movement amount per rotation (AL)" and "

Pr.4

 

Unit magnification (AM)".) 

 

The QD75MH automatically carries out the processing for [A] and [B]. 

 

The details shown below explain about the "electronic gear function", including the 
method for compensating the error in [C] above, etc. 
  [1] Basic concept of the electronic gear 
  [2] The method for compensating the error