PV Powered PVP260kW, Installation & Operation Manual

Page: 66 / 106

54
Fault
The inverter enters this state when any fault condition occurs. The inverter can enter this
state from any other state except initialize. Unless the fault is latching, the inverter clears
the fault when the fault condition subsides. The inverter displays the fault codes and
messages indicating the current fault conditions.
If the fault is latching, the inverter switches to the latched fault state. The inverter enters
this state when a latching fault condition occurs. The inverter displays the fault codes and
messages indicating the current fault conditions. When the fault is cleared, the inverter
switches to the sleep state.
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 idle 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 5 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 DC main contactor and the AC precharge-contactor,
which limits inrush current into the transformer. Once the transformer is magnetized,
the AC main contactor is closed the AC pre-charge contactor is opened. After a specified
delay, the inverter switches to the idle state.
Idle
In this state, the inverter disables the drive PWM 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.
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.