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alive” signal to the MLPE mounted/integrated at each PV module within the
array. When the inverter senses the loss of AC voltage by way of opening the
PV system disconnect switch, inverter circuit breaker or under loss of grid
events, the transmitter ceases sending signal, and the MLPE devices go into
rapid shutdown. This rapid shutdown system has been tested and certified
with both the Tigo TS4-F and APsmart RSD-S-PLC platforms to conform to
690.12 of the 2017/2020 National Electric Code.
The negative fuses have been removed from this model in accordance with
690.9(C).
Figure 2-4 CPS SCA50/60KTL-DO/US-480 Inverter Schematic, Rapid Shutdown
(RSD) Wirebox
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