Operation Chart; Opr Method (2): Count Method 1) - Mitsubishi Electric QD77MS User Manual

8.2.4 OPR method (2): Count method 1)

The machine OPR is started.
1)
(The machine begins the acceleration designated in "[Pr.51] OPR acceleration time selection", in the 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 machine stops after the workpiece has been moved the amount set in the "[Pr.50] Setting for the movement amount
4)
after near-point dog ON" after the near-point dog turned ON. It then restarts and stops at the first zero point.
The OPR complete flag ([Md.31] Status: b4) turns from OFF to ON, and the OPR request flag ([Md.31] Status: b3) turns
5)
from ON to OFF.
POINT
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.
Adjust the setting for the movement amount after
near-point dog ON to be as near as possible to
the center of the zero signal HIGH.
If the setting for the movement amount after
near-point dog ON falls within the zero signal,
there may be produced an error of one servo
motor rotation in the OPR stop 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 1)".
In the OPR with the "count method 1)", the following operations can be performed:
 The machine OPR on the near-point dog

The machine OPR again after the machine OPR is completed

Operation chart

V
Near-point dog OFF
Zero signal
ON
OFF
ON
OFF
OFF
Standby
OPR
0
Inconsistent
Inconsistent Value the machine moved is stored
Fig. 8.6 Count method 1) machine OPR
Pr. 46 OPR speed
Pr. 50 Setting for the movement amount
Pr. 47 Creep speed
A
Md.34 Movement amount after near-point dog ON
ON
Standby
8 - 10
Chapter 8 OPR Control
after near-point dog ON
t
Leave sufficient distance from the home
position to the near-point dog OFF.
First zero signal after moving a set to " Pr. 50
Setting for the movement amount after near-
point dog ON.
One servo motor rotation
ON
Value of 1.
OP address
1