Pre-Commissioning Checks; Electrical Checks - Power One AURORA Manual Del Usuario

8. Pre-commissioning checks

Warning! Carrying out preliminary checks before commissioning the inverter is always recommended; this way you avoid
possible damage to the unit that could be caused by its faulty installation.
The main checks to carry out are the following:
PE connection check: check the inverter has an earth connection.
Warning! Power One Aurora inverters must be connected to earth by the prepared clamp and using a cable with a section
suitable for the maximum failure current that can be had on the system. Any failure of an inverter which is not connected
to earth by the appropriate terminal block or fastening screws is to be considered outside the warranty.
Check of the input voltage values: check that the inverter's input voltage does not exceed the permitted limits (ref.
technical data table in Appendix C). Voltage values above the specifi cations can irreparably damage the unit. Any
consequent failure of the inverter is to be considered outside the warranty.
Check of the input voltage polarity: make sure the input voltage has the correct polarity.
Check of the photovoltaic generator's insulation to earth: use an insulation tester to make sure that insulation resistance
to earth for the DC section of the system is greater than 1MOhm. Resistance insulation values of less than 1MOhm do
not permit the inverter to complete the parallel with the grid. Resistance insulation values of less than 10MOhm can hide
insulation problems that could be accentuated in periods when there is humidity in the photovoltaic generator. For more
information refer to the user manual on the CD that comes in the package.
Warning! Power One Aurora inverters are equipped with an internal protection system capable of detecting dispersion
currents to earth on the DC side of the system or inside the inverter after the AC connection terminal block. These
protections, in place so as to disconnect the inverter in the event of accidental direct contact or loss of insulation, are
nevertheless not capable of protecting the inverter from a dead earth short of one of the photovoltaic generator's poles
when the equipment is already connected to the AC grid. This event could damage the inverter and any failure is to be
considered outside the warranty.
Check of the grid voltage: check that the voltage of the grid to which the inverter will be connected complies with the
values shown in the technical data table in Appendix C.
Voltage values above the specifi cations can irreparably damage the unit.
Photovoltaic Inverters

8.1 ELECTRICAL CHECKS

15 - EN