PV Powered PVP4800 Technical Information PDF herunterladen (Seite 17)

Separation of Circuits

The lower part of the inverter circuit board is divided into three sections:

The left side is dedicated to the low voltage DC communications.1.

The center is dedicated to the AC.2.

The right side is dedicated to the DC. 3.

Each section has two to three knockouts. UL 1741 standard requires a straight run of

wire, with no loops or crossover to the other circuits (sections) and low voltage versus

high voltage in each section.

Left knockouts (up to the divider) are for low voltage communications only 1.

(PVM1010 Data Monitoring Module).

Center knockouts are for AC.2.

Right knockouts are for DC.3.

Grounding

A single-point ground connection is located in the lower right-hand side of the inverter

cabinet. This is where the PV array grounding wire is terminated. The AC ground

connection is terminated next to the Line 1 and Line 2 connections on the circuit board.

The PV ground connector is attached to the cabinet with a 10-32 bolt. This ground lug is

provided to allow for the PV safety ground to be bonded to the cabinet. This is the only

place the PV ground should be connected to the inverter.

Do not tie the safety ground to the PV array positive or negative. That would defeat •

the PV ground fault protection circuit. Refer to Figure 3-8 for additional information.

See Table 3-3 for appropriate sizing of the grounding electrode. Use the maximum •

current AC or DC - whichever is larger - and multiply it by 1.25 to get the maximum

current rating per NEC 690.

Maximum

Current Rating

Minimum Size of Grounding

Electrode Conductor AWG

Copper Aluminum

Copper Clad

15 8 6

20 8 6

30 8 6

40 8 6

60 8 6

Table 3-3 Grounding Electrode Sizing

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 41 42

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PV Powered PVP4800 Technical Information Seite 17