2.10 DC Arc-fault Protection
The inverters include DC Arc-fault detection compliant with UL 1699B. 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 following rapid shutdown listed
below.
The Standard version of the inverter wirebox is also compatible with a
Sunspec powerline communication transmitter mounted in an external
enclosure when used with the compatible rapid shutdown devices.
The SCA36/50/60KTL-DO/US-480 inverters are PVRSS (PV Rapid
Shutdown System) certified to perform module-level rapid shutdown when
used with APS RSD-S-PLC/RSD-D products.
When the inverter is connected to the AC voltage source (grid) the powerline
communication (PLC) transmitter integrated within the RSD wirebox
receives power via an internal power supply. Once the transmitter is powered
it will send a “keep alive” signal on the PV string wiring to the MLPE mounted
or integrated at each PV module within the array.
Opening the PV system AC disconnect or AC circuit breaker initiates Rapid
Shutdown: The AC conductors become de-energized, the inverter will detect
the loss of AC voltage and cease operation, and the integrated transmitter
will lose its power source and cease sending the “keep alive” signal.
When the PLC transmitter is mounted in an external enclosure and used
with the Standard wirebox, a dedicated power supply for the transmitter and
common RSD Initiation device (e.g., AC disconnect) with the inverter must
be used. Please refer to the MLPE device user manual for installation
and operation requirements.
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