Specifications

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3.2.3 QD75 sub functions and common functions
(1) Sub functions
The functions that assist positioning control using the QD75 are described below.
(Refer to QD75 User
'
s Manual for details on each function.)
Sub function Details
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 zeroing
dog with JOG operation, etc.
Functions
characteristic
to machine
OPR
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.
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.
When the movement amount per pulse is set, a flexible positioning
system that matches the machine system can be structured.
Functions that
compensate
control
Near pass function*
1
This function suppresses the machine vibration when the speed
changes during continuous path control in the interpolation control.
Speed limit function
If the command speed exceeds "speed limit value" during control,
this function limits the commanded speed to within the "speed limit
value" setting range.
Torque limit function*
2
If the torque generated by the servomotor exceeds "torque limit
setting value" during control, this function limits the generated
torque to within the "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.
Functions that
limit control
Hardware stroke limit
function
This function carries out deceleration stop with the limit switch
connected to the QD75 external device connector.
Speed change function
This function changes the speed during positioning.
Set the new speed in the speed change buffer memory (New
speed value), and change the speed with the speed change
request.
Override function
This function changes the speed within a percentage of 1 to 300
during positioning. This is executed using "positioning operation
speed override".
Acceleration/decelerati
on time change function
This function changes the acceleration/deceleration time during
speed change.
Functions that
change
control details
Torque change function This function changes the "torque limit value" during control.
*1: The near pass function is featured as standard and is valid only for position control. It cannot
be set invalid with parameters.
*2: Using "torque limit function" requires a "D/A conversion module" and a "drive unit capable of
issuing torque limit commands with analog voltages".