Siemens SINAMICS S120 Function Manual page 520

Function modules
8.10 Parallel connection of power units
Features
The main features of parallel connection are:
● Parallel connection of up to four Motor Modules on one motor
– Parallel connection of multiple Motor Modules on one motor with separate winding
– Parallel connection of multiple Motor Modules on one motor with a single winding
Note
Additional information and instructions in the SINAMICS S120 Chassis Power Units
Manual must be carefully taken into consideration.
● Parallel connection of up to four power units on the infeed side (closed/open loop).
● A Control Unit, which controls and monitors power units on the line and motor sides
connected in parallel, can control an additional drive, e.g. an auxiliary drive (see Section
Additional drive in addition to the parallel connection (Page 531)).
● Parallel-connected power units must be connected to the same Control Unit.
● A Control Unit CU320-2 can simultaneously actuate a maximum of one parallel
connection on the line side and one parallel connection on the motor side.
● Components at the line and motor sides for decoupling the parallel-connected power
units and for ensuring symmetrical current distribution are recommended.
● Simple commissioning, because no special parameterization is necessary.
● Individual power units can be parameterized and diagnosed (troubleshooting) with
p7000 ff.
The following modules can be connected in parallel:
● Basic Line Modules (BLM), 6-pulse and 12-pulse (each with the associated line reactors)
● Smart Line Modules (SLM), 6-pulse and 12-pulse (each with the associated line reactors)
● Active Line Modules (ALM), 6-pulse and 12-pulse (each with the associated Active
Interface Modules)
● Motor Modules (in vector control mode)
Note
Deactivate edge modulation
With a chassis parallel connection and motor with winding systems offset by 30 degrees
(p7003 = 2), the converter can fail with activated edge modulation.
In this case, deactivate the edge modulation (p1802 ≤ 4).
520
systems (p7003 = 1).
Note
Motors with separate winding systems are recommended.
system (p7003 = 0) is possible.
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions