Siemens SINAMICS DCM Operating Instructions Manual page 424

Descriptions of functions
10.23 Connecting units in parallel and in series
Operating modes
There are 2 operating modes:
● Operation with firing angle interface (p51799 = 0 or p51799 = 21):
● Operation with current setpoint interface (p51799 = 22):
Notes
● The power unit of the slave converter must be connected to the 12-pulse transformer so
● If additional converters are connected in parallel to the master converter, then exactly the
424
Master (SINAMICS DCM 1):
– Speed control, armature current closed-loop control and field current closed-loop
control
Slave (SINAMICS DCM 2):
– Armature current closed-loop control
The master determines the theoretical firing angle and transfers it to its own gating unit
and to the gating unit of the slave. Both partial converters synchronize to their own line
supply and form their own firing points. However, for both the master as well as the slave,
their own current controller intervenes to make any corrections.
Master (SINAMICS DCM 1):
– Speed control, armature current closed-loop control and field current closed-loop
control
Slave (SINAMICS DCM 2):
– Armature current closed-loop control
The master determines the armature current setpoint and transfers this to its own
armature current controller and to the armature current controller of the slave. Both partial
converters independently control their partial current.
that its phases lag the phases of the line supply at the master by 30°. The phase
sequence must be the same.
same number of converters must also be connected in parallel with the slave converter.
SINAMICS DCM Control Module
Operating Instructions, 06.2010, C98130-A7067-A1-02-7619