Operation
2–2
153378
Description of System Operation
Overview
The GT100
is a fully automated grid-interactive photovoltaic power inverter.
System startup, system shutdown, PV power tracking, and fault detection
scenarios are all governed and monitored by the CCU2 controller within the
GT100. Manual interaction or control of the inverter is necessary only in the
event of a system fault. Additionally, the following conditions govern operation
of the GT100.
•
Stable utility AC voltage and frequency as specified in Table A-4 must be
present for all states of operation.
•
PV voltage as specified in Table A-2 must be present.
•
With the exception of the Matrix Test state, the
ON
/
OFF
switch (S3), located on
the front door of the GT100
Inverter Enclosure
, must be switched to the
ON
position for all operating states.
•
Both the AC and DC Disconnect switches must be in the ON or
closed position.
•
Fault conditions must not be present.
Faults
Fault states are automatic from any state of operation. In the event of a fault
condition, the GT100 will immediately stop processing power and execute an
immediate orderly shutdown, open both the main AC and DC contactors, and
remain in a faulted state until the fault is remedied and cleared (manually or
automatically).
Most faults are latching, and only those faults associated with grid disturbances
and Air Duct Intake temperature are auto-clearing and thus enable the GT100 to
restart after a delay period. All fault conditions arising from within the GT100
are
reported to the UFCU (Universal Frontpanel Control Unit). The 4-line VFD on
the UFCU will display a hexadecimal value (fault code) and a brief text
description of the fault.
Once the cause of the fault has been identified and corrected, and it is determined
to be safe to proceed, GT100 faults may be cleared from the UFCU keypad or via
the remote GUI.
See “Clearing Faults Manually” on page 4–4 for instructions on this procedure.
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