Siemens SINAMICS G150 Operating Instructions Manual page 28

Device Overview
2.3 Design
Special features when connecting-up and operating units connected in parallel
The DC links of the sub-cabinets connected in parallel must always be interconnected and
the connecting cables between the two sub-cabinets (cable numbers -W001 and -W002)
must be connected.
The cabinet drive units can be connected to the line supply in either a 6-pulse or 12-pulse
connection.
For a 12-pulse connection, the following special considerations must be taken into account:
● The 12-pulse connection to the line supply is only possible using a double-tier
● The checkback contacts of the main contactors and the circuit breakers are connected in
Motors with two electrically isolated winding systems and also motors with one winding
system can be used.
● When connecting a motor with one winding system, the following special considerations
● When connecting a motor with separate winding systems, the following special
During connection, installation and repair work on units connected in parallel, it must be
ensured that both sub-cabinets are electrically disconnected from the power supply.
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transformer with three winding systems.
Transformer vector groups Dy5d0 or Dy11d0 should preferably be selected.
When using sub-windings that are electrically offset with respect to one another, the line
harmonics are reduced with respect to the 6-pulse infeed.
Requirements for the transformer:
– The no-load voltages of both secondary windings must not differ from each other by
more than 0.5% (with reference to the rated voltage).
– The differences between the short-circuit voltages of the two secondary windings must
be less than 5% of the rated value.
– The minimum short-circuit voltage of the transformer should be 4%.
series in the factory and wired to digital input 5 of the Control Unit.
When the drive unit is being commissioned, the checkback signal monitoring function
must be activated.
This is realized using parameter p0860{VECTOR} = 722.5{CONTROL_UNIT}.
must be taken into account:
– The motor connections of the Power Modules can be connected to one another at the
motor per phase. Parameter p7003 (winding system) must be set to "0" (one winding
system).
– If a motor reactor is not being used (option L08), observation of the minimum cable
lengths is mandatory (refer to the section titled "Electrical installation").
considerations must be taken into account:
– Every Power Module motor connection must be connected to its own winding system.
Parameter p7003 (winding system) must be set to "1" (multiple separate winding
systems or motors).
– Motors with 30 ° offset windings cannot be operated
DANGER
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A