Fuseless Technology - Siemens SINAMICS GL150 Operating Instructions Manual

12-pulse operation has the following advantages:
● The low 12-pulse torque ripple is retained during starting in the DC-link pulsing range.
● The voltage of the DC link only rises in one system in the event of a ground fault or at the
3.3.3.2

Fuseless technology

The converter is of fuseless design. In the event of a fault, limiting of the overcurrent at the input
terminals should be ensured by an appropriate transformer design. In addition, the converter
requires matched circuit breakers with a tripping time of 80 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.
Internal current transformers sense the current and evaluate it electronically. The open-loop
and closed-loop control systems prevent an impermissible rise in any overcurrent by switching
the line-side converter to inverter operation.
NOTICE
Fault due to incorrect configuration of line supply and transformer impedances
On the line side, the converter is designed for short-circuit-proof operation. Short-circuit-proof
operation is only guaranteed if the line supply and transformer impedances are in
conformance with the respective specifications in the system-specific data.
If the supply and transformer impedances cannot be maintained, material damage to the
converter can occur.
Observe the system-specific values in the "Technical data and drawings" chapter.
SINAMICS GL150 6SL38555UN113KA0Z
Operating Instructions Rev.201910281450 EXAMPLE
motor. The voltage reaches no more than the peak value of the phase voltage of one
system.
Figure 3-7 Circuit with typical harmonic spectrum
Description
3.3 Power unit
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