Power One AURORA Manual Del Usuario página 23

Problem
Intervention of the magneto-thermal
differential switch downstream the inverter.
Display message: W003 Grid Fail
Green LED: FLASHING
Yellow LED: ON
Red LED: OFF
The inverter does not establish parallel with
the grid
Display message: Waiting Sun
Green LED: FLASHING
Yellow LED: ON
Red LED: OFF
The inverter does not communicate through
the RS485 port.
Display message: none.
Photovoltaic Inverters
Possible causes
Faulty grid cable connection.
Faulty switch sizing.
Faulty sizing of the differential
protection.
Intervention of the devices external
to the inverter for protection from
transitory overvoltage.
Damage to the devices for protection
against transitory overvoltage on the
inverter' s AC side.
The inverter' s input voltage is less than
the start-up voltage.
Faulty communication line connection.
Faulty assignment of addresses to the
inverters.
Faulty assignment of communication
speed (baud-rate).
Use of an inappropriate signal converter.
21 - EN
Checks/Possible solutions
• Check the connections on the inverter' s
AC side (ref. par. 5 of this guide).
Check that the switch' s rated voltage is
•
(at least) equal to the inverter' s maximum
output voltage.
Check that the differential protection
•
downstream the inverter is A/AC type
with a sensitivity of not less than 300mA.
• Check the adequacy and status of the
protection devices used. Remove them
and retry. If necessary, replace them.
• Check the status of the inverter' s output
varistors; remove them and retry. If
necessary, replace them.
• Check that the voltage at the input
terminals is greater than the start-up
voltage.
• Check that the radiation conditions are
suffi cient to operate the system.
Check the strings' and the DC side' s
•
connections.
• Check the documentation on the sizing
of the photovoltaic system and evaluate
a possible change to the start-up voltage
on the LCD display.
• Check the connections between
the inverters and to the monitoring
system (ref. par. 7 of this guide) and the
termination of the communication line.
Check that each inverter has different
•
address to the others.
• Check that each inverter has the baud-
rate set at 19200bps.
• Power One recommends the purchase
of the PVI-RS485_RS232 or PVI-USB-
RS485_232 converter.
• If the PVI-USB-RS485_232 converter
is used, check that the output is set
correctly.