3.3.4 Gating
The PowerCards are interconnected via a low-inductance busbar, which results in a three-level
phase configuration for a voltage DC link drive. The gating boards are fitted directly onto the
IGBT modules, thereby ensuring a compact design and a high level of interference immunity.
The power semiconductors are connected through the gating boards. The gating command is
transmitted from the power stack adapter (PSA) to the gating board via a plastic fiber-optic
cable connection.
3.4 Operating principle
A constant DC-link voltage for the Motor Module is generated from the line voltage. The Motor
Module provides the power for the connected motor via the DC-link voltage.
The DC link capacitors smooth the voltage and stop the energy in the DC link. The DC link
capacitors are maintenance free and self-healing. The device is switched off when the circuit
breaker is disconnected/opened. The DC link is discharged by means of balancing resistors.
3.5 Description of the components
Further information is available in the following documents:
● Additional information about connecting the various components is provided in the circuit
manual.
● You can find information on the interfaces and LEDs of individual components in the
"Supplementary component descriptions (https://support.industry.siemens.com/cs/ww/en/
view/109768128)" document.
3.5.1 SINAMICS Control Unit
The CU320 Control Unit is the central control module of the drive's open-loop and closed-loop
control system. The connections are wired internally to the customer terminal block.
Description
3.5 Description of the components
SINAMICS GM150 6SL3810-2LN31-8AA2
34 Operating Instructions Rev.201910281332 EXAMPLE
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