System Power-On - Huawei SUN2000-25KTL-US Quick Installation Manual

5

System Power-on

NOTICE
Before switching on the AC circuit breaker between the inverter and the power grid, use a
multimeter to check that the AC voltage is within the specified range.
1. Switch on the AC circuit breaker between the inverter and the power grid.
2. Press DC SWITCH at the bottom of the inverter and rotate it to the ON position.
NOTICE
If the DC input power cables are reversely connected and the DC switch is ON, do not turn off the
DC switch immediately. Otherwise, the inverter may be damaged. Wait until the PV string voltage
reduces to the safety range. Then, turn off the DC switch, remove the positive and negative
connectors, and rectify the connection.
3. (Optional) Measure the temperatures at the joints between the DC terminals and the
connectors using a thermometer.
4. Observe the LED indicators to check the inverter operating status.
Indicator
Steady green
PV connection
indicator
Off
Steady green
Off
Grid-tie indicator
Blinking green (on for 0.5s and
off for 0.5s)
Communication
Off
indicator
Alarm state
Alarm/
Maintenance
indicator
Local
maintenance
state
Status
At least one PV string is properly connected, and
the DC input voltage of the corresponding MPPT
circuit is higher than or equal to 200 V.
The inverter disconnects from all PV strings, or
the DC input voltage of each MPPT circuit is less
than 200 V.
The inverter is grid-tied.
The inverter is not grid-tied.
The inverter receives data over RS485/PLC
communication.
The inverter has not received data over
RS485/PLC communication for 10 seconds.
Blinking red
slowly (on for 1s
The inverter has generated a warning.
and then off for
4s)
Blinking red fast
(on for 0.5s and The inverter has generated a minor alarm.
then off for 0.5s)
Steady red
The inverter has generated a major alarm.
Blinking green
slowly (on for 1s
Local maintenance is in progress.
and then off for
1s)
Blinking green
fast (on for
Local maintenance has failed.
0.125s and off
for 0.125s)
Steady green Local maintenance is successful.
14
Meaning