Chapter 4 Wiring of Inverter
Shanghai Sigriner STEP Electric Co., Ltd.
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4.3.4.2 Grounding terminal (PE)
The grounding terminal is preferably a special grounding electrode and must be well
grounded with a grounding impedance of 10Ω or less.
Do not share the grounding wire with welding machines or other power equipment.
Use the specifications specified in the technical standards for electrical equipment and
keep the grounding wire as short as possible. If the distance between the grounding wire
and the grounding point is too far, the leakage current of the inverter will make the
potential of the grounding terminal unstable.
It is recommended to use special yellow and green grounding wire, and the cross-sectional
area of the grounding wire is shown in Table 4-13.
Table 4-13 The cross-sectional area of the grounding wire
The cross-sectional area of the wire
when installed S (mm
2
)
Minimum cross-sectional area of the corresponding
ground lead Smin (mm
2
)
When grounding multiple inverters, it is recommended that a loop be avoided as much as
possible in order to avoid the formation of a loop by the grounding wire. See Figure 4-10
for the grounding method of multiple inverters.
Incorrect wiring:
If the input line voltage is applied to (U/T1, V/T2, W/T3), the inverter can be damaged.
Check the power connection before adding power to the inverter.
If another inverter is to be replaced, make sure all wiring to the inverter follows all
wiring instructions in this manual.
Failure to follow the operating instructions can result in death or serious injury.
4.3.4.3 Main circuit power input terminals (R/L1, S/L2, T/L3)
Three-phase AC power is connected through circuit breakers and main circuit terminals
R/L1, S/L2, and T/L3. The phase sequence of the input power supply is independent of the
order of the R/L1, S/L2, and T/L3 terminals, and either terminal can be connected.
In order to reduce the conducted and radiated disturbances generated by the inverter on the
input power supply, the three-phase four wire power line with shielding layer can be
selected.
Figure 4-10 Grounding method for multiple inverters
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