Protective Devices; Anti-Islanding; Panel Ground Fault - Power One AURORA PVI-OUTD-US Series Installation And Operator's Manual

Installation and Operator's Manual
(PVI-3.0/3.6/4.2-OUTD-x-US Rev: 2.1)
The block diagram shows an Aurora PVI-3.0/3.6/4.2-OUTD-US with two independent
input DC-DC converters; each converter is dedicated to a separate array with
independent Maximum Power Point Tracking (MPPT) control. This means that the
two arrays can be installed in different positions and orientations. Each array is
controlled by an MPPT control circuit.
Thanks to its high efficiency and a generously-sized heat sink, the Aurora inverter
provides maximum power operation in a broad range of ambient temperatures. The
inverter is controlled by two independent Digital Signal Processors (DSPs) and one
central microprocessor. This way, grid connection is controlled by two independent
computers in full compliance with electrical power supply and safety regulations.
The Aurora inverter operating system communicates with the related parts to proceed
to data processing. This process ensures optimal performance levels of the whole
units, as well as a high efficiency under all solar radiation and load conditions, while
always in full compliance with the applicable directives, standards, and regulations.
2.4

Protective Devices

2.4.1

Anti-Islanding

When the local power distribution grid fails due to a fault or when the equipment is
shut down for maintenance operations, the Aurora inverter should be physically
disconnected under safety conditions, so as to protect any personnel working on the
grid, in full compliance with the applicable prevailing national standards and
regulations. To avoid any possible islanding operation, the Aurora inverter is provided
with an automatic disconnection protective system called Anti-Islanding.
The AURORA PVI-3.0/3.6/4.2-OUTD-US model is equipped with a state-of-the-art
anti-islanding protection system certified to the following standards and regulations:
•
CSA-C22.2 N.107.1-01 UL Std N.1741
2.4.2

Panel Ground Fault

The Aurora PVI-3.0/3.6/4.2 versions have been designed for use with panels with a
floating connection (positive and negative terminals not connected to ground). A
sophisticated ground protection circuit continually monitors the ground connection;
when it detects a ground fault, this circuit shuts down the inverter and turns on a red
LED on the front panel to indicate a ground fault condition. The Aurora inverter is
equipped with a terminal for the system grounding conductor; see section 3.3.6 (steps
3 and 4) for more details.
NOTE: For more details of Aurora inverter shutdown or possible causes of
malfunction, please refer to sections 5.3 and 5.4.
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