Mitsubishi Electric MELSEC iQ-R RD75P4, User Manual

Page: 383 / 598

12 DATA USED FOR POSITIONING CONTROL
12.3 Basic Setting
381
12
[Pr.2] No. of pulses per rotation (16 bits) (Ap)
Set the number of pulses required for a rotation of the motor shaft with 16 bits. When [Pr.62] Electronic gear selection is set to
0: 16 bits, this area is valid.
If a Mitsubishi servo amplifier is used, set the value given as Resolution per rotation of the servomotor in the speed/position
detector specifications. (When Resolution per rotation of the servomotor of the Mitsubishi servo amplifier exceeds 65535
pulses, configure the setting referring to the Servo Amplifier Instruction Manual.)
• Number of pulses per rotation (Ap) = Resolution per rotation of the servomotor
■
Buffer memory address
The following table shows the buffer memory address of this area.
■ Setting range
The setting range is 1 to 65535.
■
Default value
The default value is 20000 for all the axes.
■ Movement amount per pulse
In the RD75, the parameters [Pr.2] to [Pr.4] define the movement amount per pulse when a pulse train is output. (The
following explains how to set the individual parameters [Pr.2], [Pr.3], and [Pr.4] when mm is selected for [Pr.1] Unit setting.)
The movement amount per pulse is given by the following calculation formula:
Due to the mechanical tolerance, the actual movement amount may differ slightly from the specified movement amount. The
error can be compensated by adjusting the value set in Movement amount per pulse. (

Page 381 Movement amount per
pulse)
If the movement amount per pulse is less than 1, command frequency variations occur. Smaller values will
increase variations and may cause machine vibration. If the movement amount per pulse becomes less than
1, also use the electronic gear function of the drive unit and configure the setting so that the movement
amount per pulse is 1 or greater.
Buffer memory name Axis 1 Axis 2 Axis 3 Axis 4
[Pr.2] No. of pulses per rotation (16 bits) (Ap) 1 151 301 451
Item Symbol
[Pr.2] No. of pulses per rotation Ap
[Pr.3] Movement amount per rotation Al
[Pr.4] Unit magnification Am
Movement amount per pulse A
Movement amount per pulse (A) =
Al × Am
Ap