System Power-On

Prerequisites

Before turning on the AC switch between the SUN2000 and the power grid, use a multimeter to check that the AC voltage is within the allowed range.

• If the DC power supply is connected but the AC power supply is disconnected, the SUN2000 will report a Grid Loss alarm. The SUN2000 can start properly only after the power grid recovers.
• If the AC power supply is connected but the battery is not connected, the SUN2000 reports a Battery Abnormal alarm.
• If the SUN2000 is connected to LG batteries, turn on the DC switch within 1 minute after the AC switch is turned on. Otherwise, the SUN2000, connected to the power grid, will shut down and start again.

Procedure

1. If the battery port of the SUN2000 is connected to a battery, turn on the auxiliary power switch of the battery and then the battery switch.
2. Turn on the AC switch between the SUN2000 and the power grid.
3. (Optional) Remove the locking screw from the DC switch.
   Figure 6-1 Removing the locking screw from a DC switch
   

4. Turn on the DC switch between the PV string and the SUN2000 if there is any.
5. Turn on the DC switch at the bottom of the SUN2000.
6. Observe the LEDs to check the SUN2000 operating status.
   Table 6-2 LED indicators 1

   Category	Status		Description
   Running indicator	LED1	LED2	–
   	Steady green	Steady green	The SUN2000 is operating in grid-tied mode.
   	Blinking green at long intervals (on for 1s and then off for 1s)	Off	The DC is on and the AC is off.
   	Blinking green at long intervals (on for 1s and then off for 1s)	Blinking green at long intervals (on for 1s and then off for 1s)	Both the DC and AC are on, and the SUN2000 is not exporting power to the power grid.
   	Off	Blinking green at long intervals (on for 1s and then off for 1s)	The DC is off and the AC is on.
   	Steady orange	Steady orange	The SUN2000 is operating in the off-grid mode.
   	Blinking orange slowly	Off	The DC is on, and the SUN2000 has no output in the off-grid mode.
   	Blinking orange slowly	Blinking orange slowly	The SUN2000 is operating in the overload in backup mode.
   	Off	Off	Both the DC and AC are off.
   	Blinking red at short intervals (on for 0.2s and then off for 0.2s)	–	There is a DC environmental alarm, such as an alarm indicating that High String Input Voltage, String Reverse Connection, or Low Insulation Resistance.
   	–	Blinking red at short intervals (on for 0.2s and then off for 0.2s)	There is an AC environmental alarm, such as an alarm indicating Grid Undervoltage, Grid Overvoltage, Grid Overfrequency, or Grid Underfrequency.
   	Steady red	Steady red	Fault.
   Communication indicator	LED3		–
   	Blinking green at short intervals (on for 0.2s and then off for 0.2s)		Communication is in progress.
   	Blinking green at long intervals (on for 1s and then off for 1s)		The mobile phone is connected to the SUN2000.
   	Off		There is no communication.

   If the off-grid load is overloaded, indicators LED1 and LED2 on the inverter blink orange slowly. Reduce the off-grid load power and manually clear the alarm or until the inverter is recovered. The inverter attempts to restart at an interval of 5 minutes. If the inverter fails to restart for three times, the interval changes to 2 hours. If the inverter is standby in off-grid mode, check the inverter alarms and rectify the fault.

   Table 6-3 LED indicators 2

   Category	Status			Description
   Device replacement indication	LED1	LED2	LED3	–
   	Steady red	Steady red	Steady red	The SUN2000 hardware is faulty. The SUN2000 needs to be replaced.