Mitsubishi Electric MELSEC-Q Series User Manual page 385

Precautions during operation
(1) The error "Start at HP" (error code: 201) will occur if another machine HPR is
attempted after a machine HPR completion when the HPR retry function is not
set ("0" is set in "[Pr.48] HPR retry").
(2) Machine HPR carried out from the proximity dog ON position will start at the
"[Pr.47] Creep speed".
(3) The proximity dog must be ON during deceleration from the HPR speed
"[Pr.47] Creep speed".
(4) When the stop signal stops the machine HPR, carry out the machine HPR
again. When restart command is turned ON after the stop signal stops the
HPR, the error "HPR restart not possible" (error code: 209) will occur.
(5) After the home position return (HPR) 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 (HPR) without passing the zero point.
The workpiece will continue decelerating and stop if the proximity dog is
turned OFF before it has decelerated to the creep speed, thus causing the
error "Dog detection timing fault" (error code: 203).
Machine HPR start
(Positioning start signal)
HPR request flag
( Md.31 Status : b3)
HPR complete flag
( Md.31 Status : b4)
Md.26 Axis operation status
Md.34 Movement amount
after proximity dog ON
Md.20 Feed current value
Md.21 Feed machine value
Fig. 8.4 Operation when the proximity dog is turned OFF before the creep speed is reached
V
Pr. 46 HPR speed
Proximity dog OFF
ON
OFF
ON
OFF
OFF
Standby HPR
Inconsistent 0
Inconsistent
Value the machine moved is stored
8 - 9
Chapter 8 HPR Control
Pr. 47 Creep speed
t
ON
Error
Address at stop