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Connecting an MBUS Cable
Context
- If both the SmartLogger and the solar inverter support MBUS, the SmartLogger can be connected to the solar inverter through an AC power cable. In this case, you do not need to connect the RS485 communications cable to the solar inverter.
- If the SmartLogger uses an AC power cable as the communications cable, an MCB and a knife fuse switch need to be installed to prevent device damage in the case of short circuits.
The rated power of the PV system connected to the MBUS port on the SmartLogger must be greater than 75 kW.
Figure 4-4 MBUS networking
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Procedure
- Connect an MBUS cable.Figure 4-5 Connecting an MBUS CableTable 4-1 Components
No.
Component
Specifications
Quantity
1
Busbar L1/L2/L3
N/A
1
2
Fuse
- When the rated AC voltage on the low-voltage side of the box-type transformer is less than or equal to 500 V, the rated voltage should be greater than or equal to 500 V; when the rated AC voltage on the low-voltage side of the box-type transformer is greater than 500 V and less than or equal to 800 V, the rated voltage should be greater than or equal to 800 V
- When the rated AC voltage on the low-voltage side of the box-type transformer is less than or equal to 500 V, the rated current should be greater than or equal to 6 A; when the rated AC voltage on the low-voltage side of the box-type transformer is greater than 500 V and less than or equal to 800 V, the rated current should be greater than or equal to 32 A
3
3
Knife fuse switch box
- When the rated AC voltage on the low-voltage side of the box-type transformer is less than or equal to 500 V, the rated voltage should be greater than or equal to 500 V; when the rated AC voltage on the low-voltage side of the box-type transformer is greater than 500 V and less than or equal to 800 V, the rated voltage should be greater than or equal to 800 V
- When the rated AC voltage on the low-voltage side of the box-type transformer is less than or equal to 500 V, the rated current should be greater than or equal to 6 A; when the rated AC voltage on the low-voltage side of the box-type transformer is greater than 500 V and less than or equal to 800 V, the rated current should be greater than or equal to 32 A; number of poles: 3
1
4
MCB
- When the rated AC voltage on the low-voltage side of the box-type transformer is less than or equal to 500 V, the rated voltage should be greater than or equal to 500 V; when the rated AC voltage on the low-voltage side of the box-type transformer is greater than 500 V and less than or equal to 800 V, the rated voltage should be greater than or equal to 800 V
- When the rated AC voltage on the low-voltage side of the box-type transformer is less than or equal to 500 V, the rated current is greater than or equal to 6 A and less than or equal to 32 A; when the rated AC voltage on the low-voltage side of the box-type transformer is greater than 500 V and less than or equal to 800 V, the rated current is 32 A
1
