Mitsubishi Electric MELSEC-L LD75D, Руководство пользователя

Страница: 526 / 818

524
(3) Control precautions
If values less than one pulse are generated by converting the movement amount from the start point to the end
point to pulse units with the electronic gear function, the values are not output and the machine stops at the front
side of the positioning direction.
The function accumulates values less than one pulse that were not pulse output in the LD75 and outputs one
pulse when the total cumulative value has reached one pulse or more.
To prevent values less than one pulse from being generated, set the positioning address so that the value, which
is calculated by multiplying the movement amount to the end point by the inverse number of "movement amount
per pulse (A)", becomes an integer.
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])
• When the setting of the movement amount per pulse is decreased, the command frequency may increase.
Be careful when changing the setting.
• If the setting of the movement amount per pulse is less than 1, the mechanical system may oscillate.
• Set the movement amount per pulse so that the pulse output frequency for the drive unit becomes a value in
the following table.
Remark
In the LD75, the general term for the functions in this section 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.
Be sure to use the movement amount per pulse among the range indicated below.
If the mechanical system oscillates, also use the electronic gear function of the drive unit and make the
movement amount per pulse greater.
LD75P  LD75D 
Pulse output frequency for drive unit 200kpulse/s or less 4Mpulse/s or less
If the setting of pulse output frequency for the drive unit exceeds a value in the table, the LD75 may not
operate correctly.
V
Movement amount per pulse
Start point End point
(positioning address)
V
Movement amount per pulse
Start point
End point
(positioning address)
Movement amount per pulse (A) >
1
500