Mitsubishi MELSEC-Q QD77MS, User Manual

Page: 421 / 976

8 - 8
Chapter 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: Not need to pass motor Z-phase after the power
supply is switched on." with "Function selection C-4 (PC17)", it is possible to
carried out the home position return (OPR) without passing the zero point.
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
Error
Pr. 46 OPR speed
Pr. 47 Creep speed
OPR Standby
Inconsistent
Inconsistent Value the machine moved is stored Address at stop
Machine OPR start
(Positioning start signal)
OPR request flag
( Md.31 Status : b3)
Md.26 Axis operation status
Md.34 Movement amount
after near-point dog ON
Md.20 Current feed value
Md.21 Machine feed value
OPR complete flag
( Md.31 Status : b4)
Fig. 8.4 Operation when the near-point dog is turned OFF before the creep speed is reached