Opr Method (3): Count Method 2) - Mitsubishi Electric QD77MS User Manual

8.2.5 OPR method (3): Count method 2)

The machine OPR is started.
(The machine begins the acceleration designated in "[Pr.51] OPR acceleration time selection", in the
1)
direction designated in "[Pr.44] OPR direction". It then moves at the "[Pr.46] OPR speed" when the
acceleration is completed.)
2)
The machine begins decelerating when the near-point dog ON is detected.
3)
The machine decelerates to the "[Pr.47] Creep speed", and subsequently moves at that speed.
The command from the Simple Motion module will stop and the machine OPR will be completed when the
4)
machine moves the movement amount set in "[Pr.50] Setting for the movement amount after near-point
dog ON" from the near-point dog ON position.
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
The following shows an operation outline of the OPR method "count method 2)".
The "count method 2)" method is effective when a "zero signal" cannot be received.
(Note that compared to the "count method 1)" method, using this method will result in
more deviation in the stop position during machine OPR.)
Operation chart
Pr. 46 OPR speed
V
Near-point dog
ON
OFF
ON
OFF
OFF
Standby OPR
Inconsistent 0
Inconsistent
Value the machine moved is stored
Fig. 8.8 Count method 2) machine OPR
Pr.50 Setting for the movement amount
after near-point dog ON
Pr. 47 Creep speed
Md.34 Movement amount after near-point dog ON
ON
OFF
ON
Standby
Value of
OP address
8 - 12
Chapter 8 OPR Control
t
Leave sufficient distance from the home
position to the near-point dog OFF.
1
.
1