3.4 Components
3.4.1 Double submodule
A double submodule comprises the following mechanical units that can be separated:
● Gating unit
● Capacitor bank with submodule capacitors
① Gating unit
② Capacitor bank with submodule capacitors
Image 3-2 M2C double submodule
See also
Replacing the double submodule (Page 108)
3.4.1.1 Gating unit
Each gating unit comprises the following components:
● Cooling plate
● Two IGBT modules
● Control electronics
● Discharge resistors
A branch reactor is located in each phase, between the branch connections and the phase
output. The IGBTs can limit and disconnect a short-circuit current. This means that the drive
is short-circuit proof, that is, a short-circuit will not damage the device but instead will cause
the drive to stop.
For M2C topology, a low-inductance busbar is only required within the double submodule. The
control electronics takes its power from the submodule capacitors. The gating electronics is
mounted directly above the IGBT modules, and therefore guarantees a compact design with
high noise immunity.
Description
3.4 Components
SINAMICS SM120 6SL38855?B
Operating Instructions 12/2015 33
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