Inching Operation; Outline Of Inching Operation - Mitsubishi Electric QD75MH1 User Manual

11 MANUAL CONTROL

11.3 Inching operation

11.3.1 Outline of inching operation

PLC READY signal [Y0]
All axis servo ON
[Y1]
QD75 READY signal
[X0]
Forward run JOG start signal
[Y8,YA,YC,YE]
BUSY signal
[XC,XD,XE,XF]
Positioning complete
signal
[X14,X15,X16,X17]
Important
When the inching operation is carried out near the upper or lower limit, use the
hardware stroke limit function (Refer to Section 12.4.4).
If the hardware stroke limit function is not used, the workpiece may exceed the
movement range, and an accident may result.
Inching operation
In inching operation, pulses are input to the servo amplifier at the first control cycle
(1.7ms) to move the workpiece by a designated movement amount after the
forward run JOG start signal [Y8, YA, YC, YE] or reverse JOG start signal [Y9, YB,
YD, YF] is turned ON.
The following shows the example of inching operation.
When the start signal is turned ON, inching operation is carried out in the direction
1)
designated by the start signal. In this case, BUSY signal is turned from OFF to ON.
The workpiece is moved by a movement amount set in "
2)
amount".
The workpiece movement stops when the speed becomes "0". In this case, BUSY signal
3)
is turned from ON to OFF. The positioning complete signal is turned from OFF to ON.
The positioning complete signal is turned from ON to OFF after a time set in
4)
Pr.40
" Positioning complete signal output time" has been elapsed.
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
Fig. 11.12 Inching operation
2)
Forward run inching operation
1) 3)
ON
ON
ON
Pr.40
Positioning complete signal
output time
11 - 17
MELSEC-Q
Cd.16 Inching movement
4)