Mitsubishi Electric D75D4, User Manual

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MELSEC-Q
3 SPECIFICATIONS AND FUNCTIONS
3.2.3 QD75 sub functions and common functions
Sub functions
The functions that assist positioning control using the QD75 are described below.
(Refer to PART 2 for details on each function.
Sub function Details
Reference
section
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.
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.
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.
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.
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.
12.3.3
Output timing selection of
near pass control
This function allows the user to select the timing to output the
difference (
) between the actual and the set positioning
end addresses in continuous path control, in which the
difference (
) is output during the execution of the next
positioning data.
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.
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.
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.
12.4.3
Hardware stroke limit
function This function carries out deceleration stop with the limit switch
connected to the QD75 external device connector.
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 ).
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".
12.5.2
Acceleration/deceleration
time change function
This function changes the acceleration/deceleration time during
speed change. (Functions added to the speed change function
and override function)
12.5.3
Torque change function This function changes the "torque limit value" during control.
12.5.4
Target position change
function
This function changes the target position during positioning.
Position and speed can be changed simultaneously.
12.5.5