• DOK-DIAX02-DDS02.1*ANA-ANW1-EN-E1,44 • 12.96
80
Machine axes that cannot achieve the required torque with one servo
drive alone are equipped with two drives working according to the
master/slave principle.
The master drive controls the velocity for both the positively locked
drives.
The slave drive receives its torque command as an analog voltage signal
from the master, working as a torque arm.
Danger!
NEVER operate the slave drive on its own. Even the smallest
torque command signal will cause the slave drive to rev up
uncontrollably. To avoid this, make sure the two drives are
positively locked.
1. Set the operating mode "velocity loop" on the master drive controller.
2. Call up the "OPERATING MODES, SCALING" menu on the master
controller.
3. Analog output: channel 2 : Call up the current command value by
hitting the or arrow keys.
4. Connect up the analog output of the master AK2 connector X3.3 with
the analog input E1 of the slave drive controller.
5. Connect up the master’s OV
M
(test) (connector X3.4) to the analog
input E2 of the salve.
6. Make sure the master and slave drives are force locked and positively
locked.
7. Set the "torque loop" mode on the slave controller.
8. Continue parametrizing the slave drive in the same way as the master.
The circuit diagram for connecting up drive controllers for master/slave
operation (same direction of rotation for master and slave) is shown in
Fig. 78.
Depending on the method used to positively lock the drives, the direction
of rotation of master and slave may be the same or opposite.
Same direction of rotation for master and slave
– Connect up master AK2 to slave E1
– Connect up master OV
M
to slave E2
Opposite direction of rotation for master and slave
– Connect up master AK2 to slave E2
– Connect up master OV
M
to slave E1
7.10. Master/slave
mode
7. Commissioning the functions of the digital AC servo drive
Procedure for setting up
a master/slave drive
Reversing the direction
of rotation
Wiring
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