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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
Before connecting the power supply, be sure to disconnect the
generator’s DC switch. When exposed to the sun, the photovoltaic
generator produces a voltage that can be dangerous!
Before connecting the power supply, make sure that the voltage of the
DC cables is within the permissible operating range, below 60 V DC, and
that the DC circuit breaker switch is open. Otherwise, the high voltage
may cause serious damage.
Danger
If the 3PH 50000TL-60000TL-V1 inverter is connected directly to the
grid, make sure that the PV strings are not grounded.
If the DC voltage has a non-zero value between the positive terminal of
the PV strings and the ground, the PV strings are subject to insulation
faults. Fix the fault before connecting the cables.
During the installation of the PV string and inverter, the positive and
negative terminals of the PV strings must be grounded if the power
supply cables are not properly installed or extended. In this case, a DC
short circuit may occur and the inverter may be damaged.
If the PV string is to be grounded, install a four-wire three-phase
insolation transformer on the output side and disable the ISO detection
function; refer to related chapter “Insulation Resistance.” If an isolation
transformer is not installed, the inverter may be damaged.
Note
Context
Cross section (mm
2
/ AWG)
Outer diameter of cable (mm)
Range
Recommended value
4.0-6.0 / 11-9
4.0 / 11
4. 5 - 7. 8
Table 1 – Recommended specifications for DC input cables
The DC input connectors (MC4) are classified into positive and negative connectors, as shown in the figures
below.
