Precautions During Operation - Mitsubishi Electric QD77MS User Manual

Precautions during operation

(1) The error "Start at OP" (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 not possible" (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 servo motor Z-phase after power
on" with "Function selection C-4 (PC17)", it is possible to carry 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 the
error "Dog detection timing fault" (error code: 203).
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. 8.5 Operation when the near-point dog is turned OFF before the creep speed is reached
V
Pr. 46 OPR speed
Near-point dog OFF
ON
OFF
ON
OFF
OFF
Standby OPR
Inconsistent
0
Inconsistent
Value the machine moved is stored
8 - 9
Chapter 8 OPR Control
Pr. 47 Creep speed
t
ON
Error
Address at stop