Siemens SINAMICS DCM Operating Instructions Manual page 566

Descriptions of functions
10.26 Connecting units in parallel and in series
Controller
• For all of the topologies, a SINAMICS DCM is used as the master converter. The other
converters are called slave converters.
• The control commands – switch-on/stop, operating enable, quick stop, etc. are fed to the
master converter for all topologies.
At the slave converters, terminals 12 and 13 must be permanently connected to
terminal 9. If, in spite of this, a control command is entered at a slave converter, then it
has the following consequences:
• The speed setpoint and the actual speed value should be entered at the master
converter.
• The optimization runs should be started at the master converter. The slave converters
must be connected and ready for operation at this point.
Miscellaneous
Note
For a slave converter the i
because for a non-symmetrical current, this would then respond at the slave.
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OFF1 Has no effect, as long as n<nmin has not been reached, then the
current is reduced to zero at the slave and the slave goes into
operating state o7.0 or o7.1
OFF2 The current is reduced to zero at the slave, then the slave goes into
operating state o10.1 or o10.2
OFF3 No effect, as long as n<nmin has not been reached, then the
current is reduced to zero at the slave and the slave goes into
operating state o9.1 or 9.2
E-STOP The current is reduced to zero at the slave, then the slave goes into
operating state o10.3
Operating enable The current is reduced to zero at the slave, then the slave goes into
operating state o1.1 or o1.
As long as the master does not receive a switch-on command, the slaves stay in
operating state o10.0 (wait for switch-on from the master).
If the master receives a switch-on command, then it automatically transfers this to the
slaves. Then, all devices carry out their switch-on sequence, i.e. they attempt to go
into operating state o0. However, the master waits in operating state o1.7 until all
slaves have reached operating state o0 (exception: n+m operation for a 6-pulse
parallel connection)
If a slave leaves operating state o0, then the master outputs fault message F60044
(exception: n+m operation for a 6-pulse parallel connection)
t monitoring of the motor should be deactivated (p50114 = 0),
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SINAMICS DCM Control Module
Operating Instructions, 12/2018, A5E34888669A