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1- Introduction and safety
• Installing the equipment in environments with flammable conditions.
• Using the equipment with safety devices not working or disabled.
• Using the equipment or parts of the equipment by connecting it to other machines or
equipment, unless otherwise expressed.
• Modifying areas that are operator restricted and/or altering parts of the equipment in
order to vary the performance or change its protection.
• Cleaning with corrosive products that may corrode parts of the equipment or with products
that might generate electrostatic charges.
• Using or installing the equipment or parts of it without having read and correctly interpreted
the contents of this manual.
• Blocking airflow to the cooling fins (e.g., warming or drying rags) on the unit or accessory
parts is dangerous and could compromise the inverter operation.
A
rc fault detection (AFD)
The 2011 National Electric Code (NEC) and 2013 Canadian Electric Code (CEC) includes a new condition that
requires a photovoltaic system with a DC voltage greater than 80V, and which is on a building or whose DC
conductors enter a building, be equipped with a Listed device which can detect a DC arc fault and interrupt the
circuit. This functionality is commonly referred to as a DC Arc Fault Current Interruption.
The ABB DC ARC FAULT DETECTOR and INTERRUPTOR (AFDI) solution is based on Digital Signal
Processor (DSP) technology. The AFDI module has two independent channels, designed to accommodate the
two independent MPPT channels associated with all ABB String inverters, and has two current sensors and
associated circuitry to identify the presence of a series DC arc fault at the input of either inverter MPPT channel.
The DC AFDI module performs a self-test every time the system is started and the inverter display shows the
result, which can only be pass or fail. If it fails, an error code will be displayed and the inverter will not connect
to the grid. If it passes, the inverter connects and works normally.
If a DC arc fault is detected during normal operations, the inverter disconnects from the AC grid. The DC arc
fault error is indicated on the inverter display screen and lock out of inverter operation is initiated until the fault
is manually reset.
NOTE: Refer to Arc Fault Detection Self-Test Errors (-A Models Only) in section 5 for display error
messages and instructions to reset fault conditions or manually start the self-test procedure.
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A
vailable versions
This document applies only to the following transformerless inverter models which can be divided into two
groups according to their rated output power of 3.0 kW, 3.6 kW, 3.8kW or 4.2kW..