11 MANUAL CONTROL

11.2 JOG operation

11.2.1Outline of JOG operation Important

MELSEC-Q

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

1) START signal, and continues for the acceleration time designated in " Pr.32 JOG 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 " Cd.17 JOG speed",

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

3)" Cd.17 JOG speed", and continues for the deceleration time designated in " Pr.33 JOG operation deceleration time selection".

4)The operation stops when the speed becomes "0". At this time, the BUSY signal changes from ON to OFF.

 

JOG speed

 

 

 

 

 

Acceleration for the acceleration

 

 

 

Deceleration for the deceleration

time selected in

 

 

Forward JOG run

 

time selected in

 

 

 

 

 

 

 

 

 

1)

2)

3)

4)

 

 

 

 

 

 

Reverse JOG run

 

 

ON

 

 

 

 

PLC READY signal

[Y0]

OFF

 

 

 

 

 

 

ON

 

 

 

 

QD75 READY signal

[X0]

OFF

 

 

 

 

 

 

 

 

 

 

Forward run JOG start signal

OFF

ON

 

 

 

 

 

 

 

[Y8, YA, YC, YE]

 

 

 

 

 

 

 

 

 

 

 

ON

Reverse run JOG start signal

OFF

 

 

 

 

[Y9, YB, YD, YF]

 

ON

 

 

 

 

 

 

 

 

 

BUSY signal[XC, XD, XE, XF]

OFF

 

 

 

 

Fig. 11.4 JOG operation

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Mitsubishi Electronics QD75P, QD75D user manual JOG operation Outline of JOG operation Important