Mitsubishi Electric MELSEC-L LD75D, User Manual

Page: 332 / 818

330
8.2.6
OPR method (4): Stopper method 3)
The following shows an operation outline of the "stopper method 3)" OPR method.
The "stopper method 3)" method is effective when a near-point dog has not been installed. (Note that the operation is
carried out from the start at the "[Pr.47] Creep speed", so it will take some time until the machine OPR completion.)
(1) Operation chart
1.
The machine OPR is started. (The machine moves at the "[Pr.47] Creep speed", in the direction
designated in "[Pr.44] OPR direction". Torque limiting is required at this time. If the torque is not
limited, the servomotor may fail when the machine presses against the stopper in step 2.)
2.
The machine presses against the stopper at the "[Pr.47] Creep speed" and stops.
3.
The pulse output from the LD75 will stop at the zero signal after the machine stops, outputting the
"deviation counter clear output" to the drive unit. (A "deviation counter clear signal output time" is
set in [Pr.55].)
4.
After a "deviation counter clear signal" is output to the drive unit, the OPR complete flag ([Md.31]
Status: b4) turns from OFF to ON and the OPR request flag ([Md.31] Status: b3) turns from ON to
OFF.
1. 2. 3. 4.
0
t
ON
OFF
ON
OFF
OFF
ON
V
OPR request flag
OPR complete flag
Valid torque limit range
Creep speed
Torque limit
Zero signal
Stops at stopper
Deviation counter clear output
Standing by
In OPR
Standing by
Inconsistent
Movement amount
after near-point dog ON
Inconsistent
Value the machine moved is stored OP address
Inconsistent
OPR torque limit value
Current feed value
Pr.47
Pr.55
Md.34
Torque limit stored value
Md.35
Md.20
Md.21
Md.31
Md.31
Md.26
Machine feed value
Machine OPR start
(Positioning start signal)
[Y10,Y11,Y12,Y13]
Status : b3
Status : b4
Axis operation status
Deviation counter clear
signal output time