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Siemens SINAMICS G120P Operating Instructions Manual page 11

Output reactors
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Limiting the voltage rate of rise and voltage peaks using an output reactor and dv/dt filter
Fast-switching IGBTs in the converter result in high voltage gradients dv/dt at the converter
output. If long motor cables are used, this leads to an additional current load on the
converter due to capacitive charge/discharge currents. The high voltage gradients, and the
resulting transients at the motor terminals, cause the motors' electrical winding load to
increase as compared with direct on-line operation. In conjunction with the connected cable
capacitances, the output reactors with their adapted inductances reduce the capacitive
charge/discharge currents in the motor cables and, as a function of these motor cables, limit
the voltage gradient (dv/dt) and the transients Û
Figure 2-1
Output reactors
Operating Instructions, 05/2017, A5E32846921B AE
Limiting the voltage rate of rise and voltage peaks using an output reactor and dv/dt filter
at the motor terminals.
LL
General
11

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