Mitsubishi Electric MELSEC-L LD75D, User Manual

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CHAPTER 3 SPECIFICATIONS AND FUNCTIONS
3
3.
2
List
of
F
unct
ions
3.2.3
LD75 sub functions and common functions
(1) Sub functions
The functions that assist positioning control using the LD75 are described below.
(Refer to PART 2 for details on each function.)
Sub function Details Reference
Functions characteristic
to 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.
Page 510, Section 12.2.1
OP shift function
After returning to the machine OP, this function compensates the
position by the designated distance from the machine OP position
and sets that position as the OP address.
Page 515, Section 12.2.2
Functions that
compensate 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.
Page 518, Section 12.3.1
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.
Page 520, Section 12.3.2
Near pass function
*1
This function suppresses the machine vibration when the
positioning data is switched during continuous path control in the
interpolation control.
Page 525, Section 12.3.3
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.
Page 527, Section 12.3.4
Functions that limit
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.
Page 530, Section 12.4.1
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.
Page 532, Section 12.4.2
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.
Page 535, Section 12.4.3
Hardware stroke limit function
This function carries out deceleration stop with the limit switch
connected to the LD75 external device connector.
Page 541, Section 12.4.4
Functions that change
control details
Speed change function
This function changes the speed during positioning.
Set the new speed in the speed change buffer memory ([Cd.14]
New speed value), and change the speed with the Speed change
request ([Cd.15]).
Page 543, Section 12.5.1
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".
Page 550, Section 12.5.2
Acceleration/deceleration time
change function This function changes the acceleration/deceleration time during
speed change.
Page 553, Section 12.5.3
Torque change function This function changes the "torque limit value" during control. Page 557, Section 12.5.4
Target position change function
This function changes the target position during positioning.
Position and speed can be changed simultaneously.
Page 559, Section 12.5.5
Absolute position restoration function
*3
This function restores the absolute position of designated axis. Page 563, Section 12.6