2.6 Schematic Diagram and Circuit Design
The basic electrical schematic diagram of the CPS SCA36/50/60KTL-
DO/US-480 3-Phase String Inverters are shown in Figure 2-3 and Figure 2-
4. The input from PV source circuits passes through surge protection
circuitry, DC EMI wave filters, and independent DC-DC boost circuitry to
achieve maximum power point tracking and boost the voltages to a common
DC bus. The inverter uses line voltage and frequency measurements to
synchronize to the grid and converts the available PV energy to AC power by
injecting balanced 3-phase AC current into the electric utility grid. Any high
frequency AC component is removed by passing through a two-stage relay
and EMI wave filter to produce high quality AC power.
Figure 2-3 CPS SCA36/50/60KTL-DO/US-480 Inverter Schematic, Standard Wirebox
The Rapid Shutdown wireboxes have been designed specifically for
2017/2020 NEC Rapid Shutdown applications. These wireboxes include a
powerline communications transmitter for use with APS RSD-S-PLC/RSD-D
products. The integrated PLC transmitter is powered by AC at the inverter
output.
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