Mitsubishi Electronics QD75MH4 User Manual

 
 

 

8 - 8 

MELSEC-Q

 

8   OPR CONTROL 

 

 Precautions during operation 

 

(1)  An error "Start at home position (OP) fault (error code: 201)" will occur if another 

machine OPR is attempted after a machine OPR completion when the OPR retry 
function is not set ("0" is set in "

Pr.48

 OPR retry"). 

(2)  Machine OPR carried out from the near-point dog ON position will start at the 

"

Pr.47

 Creep speed".  

(3)  The near-point dog must be ON during deceleration from the OPR speed "

Pr.47

 

Creep speed".  

 

(4)  When the stop signal stops the machine OPR, carry out the machine OPR again. 

When restart command is turned ON after the stop signal stops the OPR, the error 
"OPR restart impossible (error code: 209)" will occur. 

 

(5)  After the home position return (OPR) has been started, the zero point of the encoder 

must be passed at least once before point A is reached. 
However, if selecting "1: It is not necessary to pass through the Z phase after the 
power on." with " 

Pr.180

 Function selection C-4", it is possible to carried out the 

home position return (OPR). 

 

   The workpiece will continue decelerating and stop if the near-point dog is turned OFF 

before it has decelerated to the creep speed, thus causing an error "Dog detection 
timing fault (error code: 203)". 

 

t

V

ON

OFF

ON

OFF

OFF

0

ON

Near-point dog OFF 

In error

Pr. 46 OPR speed 

Pr. 47 Creep speed

In OPR

Standing by

Inconsistent 

Inconsistent 

Value the machine moved is stored

Address at stop

Machine OPR start 
(Positioning start signal)

OPR request flag
  [ Md.31 Status : b3]

OPR complete flag
  [ Md.31 Status : b4]

 Md.26 Axis operation status

Md.34 Movement amount 
after near-point dog ON

Md.20 Current feed value
Md.21 Machine feed value

 

Fig. 8.4 Operation when the near-point dog is turned OFF before the creep speed is reached