
B–64113EN–1/01
15. PMC CONTROL FUNCTION
1035
This function enables control of the Cs–axis by executing a constant
velocity command for PCM–axis control using position loop control. In
other words, the function can operate the PMC–axis at a constant velocity
by outputting command pulses equivalent to the rotational speed to the
servo position control below, instead of outputting rotational speed data
to the amplifier.
Block diagram
Command
pulse
X CMR
Position
control
Spindle (Cs–axis)
or servo amplifier
Motor
Spindle
(Cs–axis) or
servo axis
Detector
Bit 4 of parameter No. 8005 specifies either position loop control or
velocity loop control is used to execute a constant velocity command for
PMC–axis control.
For a constant velocity command, acceleration or deceleration is
performed only by its dedicated parameters and normal acceleration or
deceleration is not performed even in position control (bit 4 of parameter
No. 8005 is 1).
In position control (bit 4 of parameter No. 8005 is 1), an override is
enabled.
Set the amount of travel per rotation, expressed in least command
increments, in parameter No. 8040 for each axis and then use this to
convert from a velocity command to a position command.
The following expression is obtained by assuming that P is output pulses
(least command increment).
P =
Velocity command Parameter No. 8040 ITP time Override
60 1000 100
This function is included in the PMC–axis control function.
15.1.2
Constant Velocity
Command Position
Control
Overview
Specifications
Notes