24-V Power Supply With Multiple Inverters - Siemens SINAMICS G120D Series Operating Instructions Manual

Table 4- 7
Max. rated current of the fuse
30 A
Table 4- 8
Max. rated current
of the circuit
breaker
30 A
25 A
22 A
4.2.6

24-V power supply with multiple inverters

Installation using 24 V 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 switch off the 400 V without interrupting the 24 V supply and thus
the fieldbus communication of the inverter.
The inverter can conduct a maximum current of 8 A through its 24 V connector.
Figure 4-8
Converter with control units CU240D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34262100B AB
Feeder protection with fuse, UL category JDDZ
Short-circuit current rating SCCR (Short circuit current rating)
65 kA, 480 V 3AC
Feeder protection with circuit breaker, UL categories DIVQ and NKJH
Article No.
3RV2711..., 3RV1742..., LGG...,
or CED6...
3RV2021-4DA...
3RV.031-4DA10
3RV2721...
24 V bus from T distributor or with separate power supply
4.2 Electrical Installation
UL cat. Short-circuit current rating
SCCR (Short circuit current
rating)
DIVQ 65 kA, 480 V 3AC
NKJH 65 kA, 480 V 3AC
DIVQ 50 kA, 480 V 3AC
Installation
39