ZCS TL Series, Руководство пользователя

Страница: 31 / 74

31 / 74
Identificazione: MD-AL-GI-00
Rev. 4.0 del 31.01.18 - Applicazione: GID
Manual of 07/06/2019 Rev. 1.1 “User Manual for 20K-33KTL”

Check the polarity of the PV string to ensure the correct connection of the
cables to the string.

Be sure not to connect the positive or negative pole of the PV string to the
ground.
Note
Make sure that the following information is observed. Otherwise, there is a
risk of fire.

The modules connected in series in each string must have the same
specifications.

The open-circuit voltage for each string must be less than or equal to 1000
VDC.

The short circuit current for each input must be less than or equal to 12 A DC

The output power for each PV string must be less than or equal to the
maximum input power allowable for 10-20K TL inverters.

The positive and negative terminals of the PV strings must be connected
respectively to the positive and negative inputs of the input terminal block.
Attention

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 20-33K TL 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.
 If the photovoltaic string is to be grounded, installed a three-phase four-wire
insolation transformer on the output side and disable the ISO detection
function, with reference to Chapter 6.3 “Insulation Resistance.”In the event of
grounding of the string, if an isolation transformer is not installed, the inverter
will be damaged.
Note
Context
Cross-sectional area (mm
2
)
Outer diameter of cable (mm)
Range Recommended value
4.0-6.0 4.0 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.