System philosophy
HARDWARE REFERENCE MANUAL
40
Revision 5.0
Virtual axis ATYPE=0
fig. 28
The main use cases of a virtual axis are:
•
As perfect master axis of the machine. All the other axes follow this
virtual master axis.
•
As auxiliary axis to split a complex profile into two or more simple
movements, each assigned to a virtual axis. These movements can be
added together with the BASIC command
ADDAX
then assigned to a
real axis
MECHATROLINK-II position ATYPE=40
fig. 29
With
SERVO = ON
, the position loop is closed in the Servo Drive. Gain
settings in the TJ2-MC__ have no effect. The position reference is sent to
the Servo Drive.
Profile generator
=
MEASURED
POSITION
DEMAND
POSITION
Profile generator
M
E
TJ2-MC__
TJ1-ML__
TJ2-ECT__
TJ2-KS02
SERVO
+
_
SERVO = OFF
SERVO = OFF
Trajexia
Position Loop is
deactivated
(Gains are not
used!)
Position
command
Demanded
position
Measured
position
Position loop
Following
error
Speed
command
Position Loop
Speed Loop
Torque Loop
Note
Although
MPOS
and
FE
are updated, the real value is the value in
the Servo Drive. The real Following Error can be monitored by the
DRIVE_MONITOR
parameter by setting
DRIVE_CONTROL = 2
.
Note
The MECHATROLINK-II position
ATYPE = 40
is the recom-
mended setting to obtain a higher performance of the servo motor.