Mitsubishi Melsec-Q QD75D1, User Manual

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12 - 16
MELSEC-Q
12 CONTROL SUB FUNCTIONS
POINT
The command frequency from the QD75 is limited by a ceiling. If the command
frequency exceeds the upper limit, increase the "Movement amount per pulse (A)"
greater (N times) to decrease the command frequency.
In this case, the electronic gear on the drive unit must be increased by N times as
well.
The command pulse from the QD75 is changes to 1/N times. Therefore, multiply it
by N on the drive unit side to keep the number of motor rotations.
Since the "movement amount per pulse (A)" is increased, the position accuracy
(command resolution) for the command 1 pulse from the QD75 decreases.
Consider to decrease the command speed when the position accuracy is required.
(1) Setting range of Ap, Al, Am
Determined setting ranges are available for Ap, Al, and Am. The following
shows the setting ranges.
Setting item Setting range
Pr.2
No. of pulses per rotation (Ap) 1 to 65535
× 10
-1
m
× 10
-5
inch
× 10
-5
degree
Pr.3
Movement amount per rotation (Al) 1 to 65535
pulse
Pr.4
Unit magnification (Am) 1/10/100/1000
For details of the setting, refer to Section 5.2 "List of parameters".
If the value is beyond the setting range, setting values of each parameter
can be decreased by canceling the numerator and denominator with the
movement amount per pulse (A) kept.