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12 CONTROL SUB FUNCTIONS
12.1 Outline of sub functions
12.1.1 Outline of sub 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
1 The near pass function is validated only when the machine of the standard specification carries out the position control
with the continuous path control mode.
It cannot be invalidated with parameters.
2 To carry out "torque limit", the "D/A conversion module" and a "drive unit capable of the torque limit command with an
analog voltage" must be prepared.
"Sub functions" are functions that compensate, limit, add functions, etc., to the control
when the main functions are executed. These sub functions are executed by
parameter settings, commands from GX Configurator-QP, sub function sequence
programs, etc.
The following table shows the types of sub functions available.
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.
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.
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 speed changes
1
during continuous path control in the interpolation control.
If the command speed exceeds "
this function limits the commanded speed to within the "
value" setting range.
If the torque generated by the servomotor exceeds "
2
setting value" during control, this function limits the generated torque to
within the "
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 changed speed in the speed change buffer memory (
speed value), and change the speed with the speed change request
Cd.15
(
This function changes the speed within a percentage of 1 to 300% during
positioning. This is executed using "
override".
This function changes the acceleration/deceleration time during speed
change.
This function changes the "torque limit value" during control.
Pr.17
Torque limit setting value" setting range.
Speed change request).
12 - 2
MELSEC-Q
Details
Pr.8
Speed limit value" during control,
Pr.8
Pr.17
Cd.13
Positioning operation speed
Speed limit
Torque limit
Cd.14
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