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11 MANUAL CONTROL
11.2 JOG operation
11.2.1 Outline of JOG operation
Cd. 17 JOG speed
Acceleration for the acceleration
time selected in Pr. 32
PLC READY signal
QD75 READY signal
Forward run JOG start signal
[Y8, YA, YC, YE]
Reverse run JOG start signal
[Y9, YB, YD, YF]
BUSY signal[XC, XD, XE, XF]
Important
Use the hardware stroke limit function when carrying out JOG operation near the
upper or lower limits. (Refer to Section 12.4.4).
* If the hardware stroke limit function is not used, the workpiece may exceed the
moving range, causing an accident.
JOG operation
In JOG operation, the FORWARD run JOG start signal (Y8, YA, YC, YE) or
REVERSE run JOG start signal (Y9, YB, YD, YF) turns ON, causing pulses to be
output to the drive unit from the QD75 while the signal is ON. The workpiece is
then moved in the designated direction.
The following shows examples of JOG operation.
When the START signal turns ON, acceleration begins in the direction designated by the
START signal, and continues for the acceleration time designated in "
1)
operation acceleration time selection". At this time, the BUSY signal changes from OFF to
ON.
When the workpiece being accelerated reaches the speed set in "
2)
the movement continues at this speed.
The constant speed movement takes place at 2) and 3).
When the START signal is turned OFF, deceleration begins from the speed set in
"
Cd.17
JOG speed", and continues for the deceleration time designated in "
3)
JOG operation deceleration time selection".
The operation stops when the speed becomes "0". At this time, the BUSY signal changes
4)
from ON to OFF.
Forward JOG run
1)
2)
ON
OFF
[Y0]
ON
[X0]
OFF
ON
OFF
OFF
ON
OFF
Fig. 11.4 JOG operation
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Deceleration for the deceleration
time selected in Pr. 33
3)
4)
ON
11 - 4
MELSEC-Q
Pr.32
JOG
Cd.17
JOG speed",
Pr.33
Reverse JOG run
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