Technical data

Chapter 4 Initial On-grid Testing
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Make sure that the DC circuit breaker and AC circuit breaker
are turned off. Open the front door of the inverter and ensure
the electrical components and connections are normal.
(2) Check and make sure that all the cables are well
connected and there is no wire looseness, short circuit or
insulation loss, etc.
(3) Correct any problems identified.
4.2.2 AC connection checking
(1) Check whether the power grid A, B, C, PE cables are
tightened on L1, L2, L3 and G terminals correspondingly and
properly.
(2) When the AC side of the inverter is connected to the
power grid, measure the voltage between two terminals of
AC cables. The voltage of L1-L2, L2-L3 and L3-L1 should all
be around 480Vac.
(3) If abnormal power grid voltage or no voltage is
detected, reconfirm the power transmission from the power
grid to the inverter. If there is nothing wrong with the power
transmission, check whether the cable connection is correct.
(4) Correct any problems identified.
4.2.3 DC connection checking
(1) Check whether the PV cables are correctly
connected to the inverter’s copper bar terminals of DC side.
(2) Connect PV and energize the DC side of the inverter.
Measure the voltage between Hot and Return bars, which
should range from 300~600Vdc. If no voltage is detected,