Permitted voltage supply systems
- Voltage supply systems with grounded star point
- Inverters with all degrees of protection are intended for operation on TN and TT systems with directly grounded star point.
- Voltage supply systems with non-grounded star point
- The following inverters can be used on supply systems with a non-grounded star point (e.g. IT systems) after a corresponding conversion (see chapter Operation on an IT system):
- All devices with degree of protection IP20/NEMA 1
- All devices with degree of protection IP66/NEMA 4X
- 200/250 kW devices with degree of protection IP55/NEMA 12K
- Inverters of size 4 to 7 with degree of protection IP55 in the device variant LTP-B....-...-.-15 can be operated directly on an IT system, see chapter 3-phase system AC 380 – 480 V as an IT system version – device without filter.
- Voltage supply systems with grounded outer conductor
- The inverters with all degrees of protection may be operated only on supply systems with a maximum phase-to-ground AC voltage of 300 V.