10 Daily Maintenance
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9.3 Start-up Inverter
After electrical and mechanical inspections, first turn on the AC main switch/breaker, then turn on the DC switch. The
inverter will start automatically when the DC input voltage meets the performance requirement of the utility grid.
Normally there will be three statuses during the operation (refer to the LED indications):
1) Waiting:
Conditions: The initial DC voltage of the PV strings is greater than the Min. DC input voltage, but is lower than the DC
start-up input voltage.
Inverter cannot start-up normally and cannot feed power into utility grid either.
2) Checking:
Conditions: The initial voltage of the PV strings exceeds the start-up DC input voltage of the inverter. Meanwhile both
the voltage and frequency of the utility grid are normal.
Inverter will check the feeding conditions immediately. If anything wrong during checking, inverter will switch to the
“Fault” mode.
3) Normal:
Conditions: All the checking results are normal.
Inverter will switch to “Normal” mode and feed power into utility grid.
The inverter may turn on and off continuously during the period of low or absent sunlight due to the shortage of
power generated by the PV modules. If such fault occurs frequently, please contact the maintenance personnel.
Note: For the monitoring and local APP information, please refer to documents published on our website at:
https://monitoring.csisolar.com/platformSelect.
9.4 LED Indicators
No.
Operate states
LED Indicators
Flicker frequency
1
Wait
Green LED flicker
1s On
，
1s Off
2
Normal
Green LED always on
/
3
Error
Red LED always on
/
9.5 Switch off
DANGER
Never connect or disconnect the DC connectors under load.
Procedure:
1) Turn off the AC main switch.
2) Turn off the DC switch.
3) Check the inverter operating status.
4) Wait until LED indicator has gone out, which indicates the inverter has been shut down.
10 Daily Maintenance
DANGER
Risk of inverter damage or personal injury due to incorrect service!
Always keep in mind that the inverter is powered by dual sources: PV array and utility grid.
Before any service work, observe the following procedure.
1) Disconnect the inverter from the utility grid side first and then PV array.
2) Wait at least 5 minutes after shun down the inverter, for inner capacitors to discharge completely.
3) Verify that no voltage and current existing with appropriate testing devices.
CAUTION
Keep non-related persons away!
A temporary warning sign or barrier must be posted to keep non-related persons away while
performing electrical connection and service work.
