Mitsubishi Electronics QD75P, QD75D Position control by manual pulse generator operation

11 MANUAL CONTROL

MELSEC-Q

Position control by manual pulse generator operation

In manual pulse generator operation, the position is moved by a "manual pulse generator 1 pulse movement amount" per pulse.

The current feed value in the positioning control by manual pulse generator operation can be calculated using the expression shown below.

Current feed value = Number of input pulses ×

Cd.20

Manual pulse generator 1

pulse input magnification × Manual pulse generator 1 pulse movement amount

		Unit setting	mm	inch	degree	pulse
	Pr.1
	Manual pulse
generator 1 pulse			0.1µm	0.00001inch	0.00001degree	1pulse
movement amount

For example, when "

Pr.1

Unit setting" is mm and "

Cd.20

Manual pulse

generator 1 pulse input magnification" is 2, and 100 pulses are input from the manual pulse generator, the current feed value is as follows.

100 × 2 × 0.1 = 20 [µm]

The number of pulses output actually to the drive unit is "Manual pulse generator 1 pulse movement amount/movement amount per pulse ". For example, when

"

Pr.1

Unit setting" is mm and the movement amount per pulse is 1 µm, 0.1/1 =

1/10, i.e., the output to the drive unit per pulse from the manual pulse generator is 1/10 pulse. Thus, the QD75 outputs 1 pulse to the drive unit after receiving 10 pulses from the manual pulse generator.

	Pr.3	Movement amount per rotation
Movement amount per pulse =			Pr.4 Unit magnification

Pr.2 No. of pulses per rotation

Speed control by manual pulse generation operation

The speed during positioning control by manual pulse generator operation is a speed corresponding to the No. of input pulses per unit time, and can be obtained using the following equation.

Output command frequency = Input frequency ⋅

Cd.20

Manual pulse generator 1 pulse input magnification

11 - 30