Mitsubishi Electronics QD75D, QD75P user manual Remark

Movement amount per pulse (A) >

12CONTROL SUB FUNCTIONS

[3]Precautions during control

MELSEC-Q

It is recommended that the "movement amount per pulse (A)" be set to a value close to "1" for the following reasons. The "movement amount per pulse" of "1" means the minimum value in each " Pr.1 Unit setting". (0.1 [∝ m] for the unit [mm])

(1)If the setting of the movement amount per pulse is less than 1, the command frequency may increase, causing the actual speed to exceed the

speed limit value (" Pr.8 Speed limit value", " Pr.31

value") and the servomotor to result in overspeed.

JOG speed limit

(2)If the setting of the movement amount per pulse is less than 1, the mechanical system may oscillate. If the movement amount per pulse becomes less than 1, use the electronic gear function of the drive unit and make setting so that the movement amount per pulse is 1 or greater.

(3)Set the movement amount per pulse so that the pulse output frequency to the drive unit becomes a value of 200kpps/1Mpps or less.

If a value is set so that the pulse output frequency to the drive unit exceeds 200kpps/1Mpps , the QD75 may not operate correctly.

They indicate the values of QD75P / QD75D.

(4)When using a hundred-thirty thousand pulses encoder, use the electronic gear function of a drive unit.

(5)Use the electronic gear function among the range indicated below.

1

500

REMARK

In the QD75, the general term for the functions in items [1] to [3] above is defined as the "electronic gear function". Refer to the User's Manual for the servomotor for the definition of the "electronic gear" on the servomotor side.

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