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Engineering Guide CDA3000
4 Software functions
4.3.4 Master-/Slave
operation
Application data set 4 includes a setup for Master-/Slave operation
between inverter modules. In this way the speeds of a maximum of six
drives are permanently coupled together.
(1) Reference coupling
(2) Inverter module
(2.1)Master
(2.2)Slave
(3) IEC standard motor
(4) Application
Figure 4.45
Drive solution: “Master-/Slave operation”
In Master-/Slave operation the reference values of the inverter modules
are permanently coupled together. This reference coupling can be
effected with up to six units, with one unit being the master. The reference
value of the master is also the guide value for the devices connected to
the master (slaves). The master transmits the reference value to the
slaves by way of a data telegram. In each slave the guide value received
from the master can be scaled, meaning that any desired transmission
ratios can be set. In this way it is possible to replace mechanical speed
couplings.
The coupling of the electrical axles in VFC and SFC control modes
causes the motors to run at a fixed ratio to each other. Only in the FOR
control mode do the motors run speed-synchronous.
~
~
=
CPU
~
~
=
CPU
i1
~
~
=
CPU
i2
M
3~
M
3~
M
3~
Process
FU0
FU1
FU2
(2.1)
(2.2)
(2.2)
(1)
(3)
(4)
n1 = n0 . i1
n2 = n0 . i2
n0
(3)
(3)