9 Commissioning Inverter
14 / 32
AC OUTPUT
CT/METER
COMM. PORT
DRM
PV-1
PV-2
VENT VALVE
DO NOT DISCONNECT UNDER LOAD!
DC SWITCH
ON
OFF
FIG. 8-1 Communication Port
8.3 RS485
Connect the communication port with a RS485-to-usb port converter via RS485 serial line, and then connect this
module to PC.
9 Commissioning Inverter
9.1 Electrical Inspection
1) Check PE connections with multi-meter:
To make sure all the bare metal surfaces of the inverter are grounded.
2) Check DC voltage value:
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.
5) Check all the inverter terminals:
Ensure all unused terminals of the inverter are properly sealed with protection covers.
6) Do not remove protection covers of all the terminals before wires connected, such as DC, AC, CT/Meter and WiFi
terminals. Otherwise, the IP rating will be affected.
9.2 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.
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.
