10 Commissioning Inverter
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Check if the DC voltage of the PV string exceeds the allowable range.
3) Check the polarities of the DC voltage:
To make sure the DC polarities are correct.
4) Check the ground insulation of PV array with multi-meter:
Ensure the impedance value of ground insulation is more than 1MOhm.
10.2 Mechanical Inspection
1) Ensure the inverter is installed properly, fixed with a Wall-mounting bracket firmly, and the upper cover is installed
correctly.
2) Ensure the AC connectors are installed properly and fixed firmly.
3) Ensure the dust covers are sealed reliably which are used for the empty DC connectors.
4) Ensure all the cables are connected effectively, fixed firmly, and no visible damages to the insulation layers.
10.3 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.
10.4 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
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10.5 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.