49 / 138
Identification: MD-AL-GI-00
Rev. 1.1 of 15/03/2021 - Application: GID
User’s Manual 3PH 50000TL-60000TL-V1
Rev. 1.1 15/03/2021
5.
Commissioning the inverter
5.1.
Safety inspection before commissioning
Make sure that the DC and AC voltages fall within the range permitted by the
inverter.
Attention
Photovoltaic strings
Before turning on the inverter, it is necessary to examine the photovoltaic string. Check the open-
circuit voltage of each photovoltaic panel and compare it with the data in the technical datasheet.
- Make sure that the open-circuit voltage of each PV string corresponds to the technical data;
- Make sure that the positive and negative polarities are correct.
DC Connection
Make sure that the DC switch of the inverter is off.
Use the multi-meter to check the voltage and
current on the DC side; check the DC cable, make sure that the positive and negative polarities are
not inverted, and are consistent with the positive and negative polarities of the photovoltaic string;
otherwise, the inverter may suffer irreparable damage. Compare the voltage of each string connected
to the same MPPT; if the difference is more than 3%, the PV string may be damaged. The maximum
DC voltage (if the minimum operating temperature allowable is reached) should be less than 1000 V.
Make sure that all the photovoltaic strings are securely connected to the input of the inverter.
AC Connection
Make sure that the AC switch of the inverter is off. Check that the phases of the inverter are correctly
connected to the grid (R, S, T, N, PE). Check that the type of AC grid in which the inverter is installed
is correct (TN-C, TN-S, TT). Check that the voltage of each phase is within the correct range. If
possible, measure the THD; if there is too much distortion, the inverter may not operate properly.
Installing the front cover and the clamping screws
5.2.
Starting the inverter
1)
Turn ON the DC switch both on the field panel and on the photovoltaic inverter (if present); wait for
the screen to turn on.
2)
Turn ON the AC switch installed on the wall.
When the photovoltaic string generates enough direct current, the inverter will start automatically.
The word “normal” shown on the screen indicates the correct functioning of the inverter.
3)
Set the correct country code (refer to related chapter of this manual).
Note: Different grid operators in different countries require different specifications regarding the grid
connections of PV inverters. Therefore, it is very important to select the correct country code according to
the requirements of the local authorities.
