Siemens SINAMICS SL150 - Fuseless Technology

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Figure 3-7 Line cosϕ as a function of converter control and motor cosϕ
3.3.3.2 Fuseless technology
Components that are to be provided in fuseless design for the converter on the system side
The converter is of fuseless design. In the event of a fault, the overcurrent at the input terminals
is limited using an appropriate transformer design.
In addition, the converter requires matched circuit breakers with a tripping time of 60 ms. The
closed-loop control system triggers the circuit breakers. Each circuit breaker must be equipped
with a fail-safe OFF contact and an undervoltage coil. The circuit breakers are operated via a
back-up combination unit.
Internal current transformers sense the current and evaluate it electronically. The open-loop
and closed-loop control systems prevent the overcurrent from inadmissibly increasing in
regular operation. Prerequisite is that all of the components are appropriately selected and
dimensioned.
Description
3.3 Power unit
SINAMICS SL150 6SL38600UL432AA0Z
34 Operating Instructions Rev.201910281433 EXAMPLE