Worldwide Energy and Manufacturing USA Co., Limited
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NOTE:When the DC SWITCH and COM. is not selected, the corresponding port is filled
with a waterproof plug.
DC switch
DC switch (as shown in Figure2-5
○
1 ) is the connection switch of inverter and PV
array. When the inverter works normally, the DC switch must be ON. During installation and
wiring, the DC switch must be OFF. Before maintenance, the DC switch must be OFF for 20
minutes, and measure the voltage of DC busbar by multimeter, only when the voltage less
than 10V, the maintenance can be done.
CAUTION:when maintenance or wiring, the DC switch must be disconnected.
2.3 Work Principle
The inverter connects with PV array input and tracks the maximum power point of the PV
array, and then converts the DC power into single-phase AC power by inverter circuit. It also
provides surge protection at DC and AC side, as shown inFigure2-4, Figure2-5.
Figure2-4 Work principle diagram of AS1500-B2, AS2000-B2
Figure2-5 Work principle diagram of AS3000-B2, AS3600-B2, AS4000-B2, AS4600-B2,
AS5000-B2, AS6000-B2