Installation
4.2 Electrical Installation
Converter with control units CU250D-2
Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
49
Cable protection and cascading of the 400 V supply
Cable protection for individual inverters
If you individually protect an inverter, then you must protect the inverter feeder cable using a
fuse.
Table 4- 11 Individual fuse protection
UL-approved fuses must be used in North America. For additional information, please refer
to Catalog D31.
Installation with power bus
For installations with several inverters, the inverters are normally supplied from a 400 V
power bus using T distributors.
Figure 4-14 Inverter supplied via a power bus
The following options are available for the 24 V supply of the inverter:
1. A T distributor with integrated power supply unit supplies the 24 V.
Advantage: Low installation costs.
2. An external power supply unit supplies the 24 V.
Advantage: You can disconnect the 400 V without interrupting the 24 V supply and
therefore without interrupting the fieldbus communication of the inverter.
The inverter can conduct a maximum current of 8 A through its 24 V connector.
Protection of the 400V cable
Cable protection depends on the following conditions:
● Cable routing type.
● Limit values of the cables and system components, e.g. the T distributor.
● Country-specific guidelines.
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