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2.10 DC Arc-fault Protection
The inverters include DC Arc-fault detection compliant with UL 1699B-2018.
The inverter will detect electrical noise that is indicative of a DC series arc.
Upon detection of an arc-fault, the inverter will cease operation.
2.11 Module-Level Rapid Shutdown
The RSD version of the inverter wirebox includes a Sunspec powerline
communication transmitter for use with APS、Tigo TS4-A-F/2F (module/rack
mounted MLPE) and smart modules integrated with the APS、TS4-A-F/2F in
their junction boxes. These inverters are PVRSS certified to perform
module-level rapid shutdown in compliance with 2017 NEC 690.12.
When the inverter is connected to the AC grid the PLC transformer receives
power via an integrated power supply. Once the transmitter is powered it will
send a “keep alive” signal to the APS、TS4-A-F/2F mounted/integrated at the
array. Once the inverter senses the grid is missing, whether by opening the
PV system disconnect, inverter circuit breaker or by a loss of grid, the
transmitter will cease sending this signal. When the APS、TS4-A-F/2F do not
receive the “keep alive” signal they enter the shutdown mode with module
output reduced to 0.6V. The transmitter is capable of signaling these devices
up to 500’ (1000’ entire circuit length; to the module and back). The RSD
wirebox version of the SCA25KTL-DO/US-208 is required when using
the APS products. SCA50KTL-DO/US-480 and SCA60KTL–D O/ US-480
are required when using the APS or Tigo TS4-A-F/2F products.
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