Qd75 Sub Functions And Common Functions - Mitsubishi QD75M1 User Manual

3 SPECIFICATIONS AND FUNCTIONS

3.2.3 QD75 sub functions and common functions

Sub function
Functions OPR retry function
characteristic
to machine
OPR
OP shift function
Backlash compensation
function
Functions that
compensate Electronic gear function
control
Near pass function
Speed limit function
Functions that Torque limit function
limit control
Software stroke limit
function
Hardware stroke limit
function
Speed change function
Functions that
change control
details Override function
Acceleration/deceleration
time change function
Torque change function
Absolute position system
1: The near pass function is featured as standard and is valid only for position control. It cannot be set to be invalid with parameters.
Sub functions
The functions that assist positioning control using the QD75 are described below.
(Refer to "Section 2" for details on each function.
This function retries the OPR with the upper/lower limit
switches during OPR. This allows OPR to be carried out even if
the axis is not returned to before the near-point dog with JOG
operation, etc.
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.
This function compensates the mechanical backlash. Feed
pulses equivalent to the set backlash amount are output each
time the movement direction changes.
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.
This function suppresses the machine vibration when the
1 speed changes during continuous path control in the
interpolation control.
If the command speed exceeds "
during control, this function limits the commanded speed to
within the "
If the torque generated by the servomotor exceeds "
Torque limit setting value" during control, this function limits the
generated torque to within the "
value" setting range.
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.
This function carries out deceleration stop with the limit switch
connected to the QD75 external device connector.
This function changes the speed during positioning.
Set the new speed in the speed change buffer memory
Cd.14
(
Speed change request (
This function changes the speed within a percentage of 1 to
300% during positioning. This is executed using "
Positioning operation speed override".
This function changes the acceleration/deceleration time during
speed change.
This function changes the "torque limit value" during control.
This function restores the absolute position.
Details
Pr.8
Speed limit value" setting range.
Pr.17
New speed value), and change the speed with the
Cd.15
).
3 - 8
MELSEC-Q
Pr.8
Speed limit value"
Pr.17
Torque limit setting
Cd.13
Reference
section
12.2.1
12.2.2
12.3.1
12.3.2
12.3.3
12.4.1
12.4.2
12.4.3
12.4.4
12.5.1
12.5.2
12.5.3
12.5.4
12.6