Overvoltage Fault; Inverter Faults - Advanced Energy AE 3TL 600 Series Installation And Operation Manual

Overvoltage Fault

600 SERIES
The inverter has two DC inputs, DC1 and DC2, each of which is limited to 500 V. A
relay (combiner) inside the inverter connects the two arrays, in series, upon
activation. This doubles the voltage level inside the inverter.
A symmetry controller balances the voltages of the two terminals, positive of DC1
and negative of DC2, so they do not exceed 500 V with respect to ground under any
condition. If the controller detects an asymmetry, the controller shuts down the
inverter. When the inverter shuts down the relay opens, which connects the arrays
back into the parallel configuration, limiting the voltage of any array conductor (with
respect to ground) to 500 V.
In the rare instance of a failure of the combiner relay, the two arrays will be left
connected in series even with the inverter deactivated. Since the symmetry controller
does not operate in this condition, there is the possibility of the voltage of an array
terminal to ground exceeding 500 V. The inverter detects this fault condition and
displays the message ARRAY OVERVOLTAGE.
1000 SERIES
The 1000 series is limited to 1000 VDC maximum. If the inverter detects more than
1000 V with respect to ground, it will shut down. The inverter will display an
ARRAY OVERVOLTAGE error.
TO RESOLVE AN OVERVOLTAGE FAULT
If an ARRAY OVERVOLTAGE message is displayed on the screen, complete the
following steps:
1. Turn the DC disconnect switch to the OFF position.
2. Contact AE Solar Energy Technical Support.

Inverter Faults

The following table lists the inverter faults. If the FAULT LED is lit, check the
display message and take the appropriate action
570-1003552-05A Troubleshooting and Solar Energy Technical Support
Advanced Energy® AE 3TL Inverters
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