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Advanced Energy
• Sleep: In this state, the inverter is enabled but the DC voltage is below the
minimum operating window. When the PV input voltage rises above the
starting voltage, the inverter switches to the startup delay state.
• Startup Delay: In this state, the inverter delays a specified time and then enters
the DC precharge state. The delay depends on the conditions prior to the sleep
state and the time taken to reach this state from the previous shutdown. If a grid
interactive fault occurred on the previous shutdown, the inverter will remain in
this state for five minutes.
• DC Precharge: In this state, the inverter closes the DC precharge-contactor,
which limits inrush current into the DC bus capacitors. When the DC bus
voltage reaches the PV input voltage and is greater than the DC start voltage,
the inverter switches to the AC precharge state.
• AC Precharge: In this state, the inverter closes the main DC contactor and the
AC precharge-contactor, which limits inrush current into the transformer. Once
the transformer is magnetized, the main AC contactor is closed and the AC precharge contactor is opened. After a short delay the inverter switches to the idle
state.
• Idle: In this state, the inverter stops energy conversion and displays a message
indicating that the inverter is idle. The inverter switches to the power tracking
state when the DC voltage is above the DC start voltage. If a fault condition
occurs, the inverter switches to the fault state. If the DC voltage drops below the
minimum, the inverter switches to the sleep state.
• Cool Down: In this state, the inverter opens the main DC contactor but leaves
the main AC contactor closed to run the cooling fans. The inverter remains in
this state until the inverter temperatures are below the shutdown threshold. If
the PV input voltage rises above the start threshold, the inverter will transition
from this state to the DC precharge state.
• Power Track: In this state, the inverter operates in voltage control mode using
the maximum power point tracking (MPPT) function. If a fault occurs, the
inverter switches to the fault state.
Related Links
• “Troubleshooting and Solar Energy Technical Support” on page 8-1
DISPLAY SCREENS AND OPERATION
The digital display located on the front of the AE inverter includes both a scrolling
display screen and buttons for operating. The display provides the unit operator with
information about the current state of the inverter.
There are five standard sets of screens that may display depending on the state of the
inverter. The five sets are:
5‑4
Operation
570-1001791-05B