Siemens SIVACON Manuale di installazione - Pagina 20
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Mounting
3.7 Inrush current limitation
3.7
Inrush current limitation
Switching LV PFC capacitors can cause high inrush currents of more than 200 times the rated
current, especially when they are connected in parallel to others that are already energized. This
may cause additional stress to contactors as well as to capacitors and reduce their life cycle.
Inrush currents have a negative effect on power quality, e.g. transients, voltage drop. MKK- and
MKP-designs feature high impulse handling capability, inrush current limitation is required, e.g.
contactors with pre-charging resistors for pre-loading of capacitors.
20
Installation and maintenance instructions for Power Factor Correction (PFC) capacitors
Installation Manual, 05/2022, L1V30884033A