Mitsubishi Electric MELSEC-Q Series User Manual page 392

Precautions during operation
(1) The error "Start at HP" (error code: 201) will occur if another machine HPR is
attempted immediately after a machine HPR completion when the HP is in the
proximity dog ON position.
(2) The following shows the operation when a machine HPR is started from the
proximity dog ON position.
V
Pr.44 HPR direction
Pr.47 Creep speed
3)
2)
ON
Proximity dog
OFF
Zero signal
Fig. 8.11 Operation when a machine HPR is started from the proximity dog ON position
(3) 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.
(4) The HPR retry will not be performed regardless of setting set in "[Pr.48] HPR
retry" in the scale origin signal detection method. When a hardware limit
switch is detected during machine HPR, the error "Hardware stroke limit (+)"
(error code: 104) or "Hardware stroke limit (-)" (error code: 105) will occur.
(5) Position the proximity dog forward to overlaps with the hardware limit switch in
direction of HPR. When the proximity dog is in the opposite direction against
of HPR from the machine HPR start position, the error "Hardware stroke limit
(+)" (error code: 104) or "Hardware stroke limit (-)" (error code: 105) will occur.
1)
Pr.46 HPR speed
Hardware limit switch
HP
Machine HPR
8 - 16
[Operation when a machine HPR is started
from the proximity dog ON position]
1) The machine moves in the opposite direction
against of HPR at the HPR speed.
2) The machine begins decelerating when the
first zero signal is detected.
3) After deceleration stop, the operation moves in
direction of HPR at the creep speed, and then
stops at the zero signal to complete the
machine HPR.
POINT
After 1), when the zero signal is in the proximity
dog ON position, deceleration stop (2)) is started
at the zero signal without waiting for the proximity
dog OFF.
M
Proximity dog
Hardware limit switch
Chapter 8 HPR Control