32 Operation principle and hardware description
No. Description No. Description
1. Customer DC connections 13. AC surge arrester, Type 2 as standard, Type1
with option (+F263)
2. DC input fuses
• As standard, fuses only on the positive DC
poles (negative grounding).
• With optional positive-pole grounding
(+F282), fuses only on the negative poles.
• With the floating DC option (+F314), fuses
on both poles.
14. Optional AC disconnectors (+F253) or optional
AC breakers (+F296)
3. DC main switches (+F305) 15. Optional 3-phase auxiliary power output
(+G429/+G430)
4. DC surge arrester, Type 2 as standard, Type 1
with option (+F300)
16. MV transformer
5. DC contactors 17. MV grid
6. Functional grounding 18. 1-phase socket output
7. MIRU. Insulation resistance measurement
unit.
19. 1-phase terminal block output (+G410)
8. Power modules 20. Inverter control power
9. LCL filters 21. Auxiliary power input to the inverter
10. AC contactors (and charging system) 22. +G417 DC Input current measurement
11. AC fuses 23. AC and control section
12. Internal auxiliary supply (+G415)
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