Helios COMBO SPH3600-BL SERIES User Manual page 28

HELIOS COMBO SPH3600/5000-BL
Install AC switch K3 between grid and inverter, which is convenient to disconnect inverter with grid
when performing maintenance, as shown in Figure4-1.The recommended switch is with 250Vac/32A.
Install AC switch K4 between major load and inverter, which is convenient to disconnect inverter with
major load when performing maintenance, as shown in Figure4-1. The recommended switch is with
250Vac/32A.
Don't connect grounding wire and neutral wire, neutral wire and live wire reversely to avoid short
circuit.
As shown in Figure4-3, the grounding of inverter mustn't connect with the grounding of the lighting
rod of the building where the inverter installed. It should separate them. The grounding of inverter
should connect with the grounding system directly and the impedance should be less than 20mΩ.
Fasten AC cover and nylon cable gland firmly to avoid that water drops into wiring terminals.
The recommended wire is AWG12 or the cross-sectional area of wire is 4mm².
Figure4-3 The grounding of inverter
Step 1 Check whether the voltage and frequency of gird-connected input meet gird-connected requirements
of inverter.
Step 2 Check whether the impedance between neutral wire and grounding wire is less than 10Ω.
Step 3 Disconnect all AC switches.
Step 4 Prepare wires and strip the insulation layer of wires for about 7mm. Loosen the nylon cable gland in
the AC cover and draw the wires through it, crimp the terminals and lock them on the inverter, as
shown in Figure4-5.
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4 Electrical Connection