Mitsubishi Electric MELSEC-L LD75D, Руководство пользователя

Страница: 510 / 818

508
12.1.1
Outline of sub functions
The following table shows the types of sub functions available.
Sub function Details
Sub functions
specifically for
machine OPR
OPR retry function
This function retries the machine OPR with the upper/lower limit switches during machine OPR.
This allows machine OPR to be carried out even if the axis is not returned to before the near-
point dog with JOG operation, etc.
OP shift function
After returning to the machine OP, this function offsets the position by the designated distance
from the machine OP position and sets that position as the OP address.
Functions for
compensating
the control
Backlash compensation function
This function compensates the mechanical backlash. Feed pulses equivalent to the set backlash
amount are output each time the movement direction changes.
Electronic gear function
By setting the movement amount per pulse, this function can freely change the machine
movement amount per commanded pulse.
A flexible positioning system that matches the machine system can be structured with this
function.
Near pass function
*1
This function suppresses the machine vibration when the positioning data is switched during
continuous path control in the interpolation control.
Output timing selection of near pass
control
This function allows the user to select the timing to output the difference (

l) between the actual
and the set positioning end addresses in continuous path control, in which the difference (

l) is
output during the execution of the next positioning data.
Functions to limit
the control
Speed limit function
If the command speed exceeds "[Pr.8] Speed limit value" during control, this function limits the
commanded speed to within the "[Pr.8] Speed limit value" setting range.
Torque limit function
*2
If the torque generated by the servomotor exceeds "[Pr.17] Torque limit setting value" during
control, this function limits the generated torque to within the "[Pr.17] Torque limit setting value"
setting range.
Software stroke limit function
If a command outside of the upper/lower limit stroke limit setting range, set in the parameters, is
issued, this function will not execute positioning for that command.
Hardware stroke limit function
This function carries out deceleration stop with the limit switch connected to the LD75 external
device connector.
Functions to
change the
control details
Speed change function
This function changes the speed during positioning.
Set the changed speed in the speed change buffer memory ([Cd.14] New speed value), and
change the speed with the speed change request ([Cd.15] Speed change request).
Override function
This function changes the speed within a percentage of 1 to 300% during positioning. This is
executed using "[Cd.13] Positioning operation speed override".
Acceleration/deceleration time change
function This function changes the acceleration/deceleration time during speed change. (function added
to the speed change function and override function)
Torque change function This function changes the "torque limit value" during control.
Target position change function
This function changes the target position during the execution of positioning. At the same time,
this also can change the speed.
Absolute position restoration function
*3
This function restores the absolute position of designated axis. By this function, the OPR after
power ON from OFF is not required once the OPR is executed when the system operation is
started.