No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

SUN2000-(100KTL, 110KTL, 125KTL) Series User Manual

This document describes the SUN2000-125KTL-M0,SUN2000-110KTL-M0,SUN2000-100KTL-M0,SUN2000-100KTL-M1 and SUN2000-100KTL-INM0 in terms of its installation, electrical connections, commissioning, maintenance, and troubleshooting. BOM number: 01074693, 01074694, 01074695, 01074695-001 and 01074695-002.

Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Connecting DC Input Power Cables

Connecting DC Input Power Cables

Precautions

  • Before connecting the DC input power cable, ensure that the DC voltage is within the safe range (lower than 60 V DC) and that the three DC switches on the solar inverter are set to OFF. Failing to do so may result in electric shocks.
  • If you turn a DC SWITCH to ON by mistake when connecting or disconnecting DC input power cables, do not remove or insert DC input terminals. If you need to remove or insert a DC input terminal, perform the operations provided in Power-Off for Troubleshooting.
  • When the solar inverter operates in grid-tied mode, do not perform maintenance or operations on the DC circuit, such as connecting or disconnecting a PV string or a PV module in the PV string. Failing to do so may cause electric shocks or arcing, which may also cause fire.
Ensure that the following conditions are met. Otherwise, the solar inverter may be damaged, or even a fire could happen.
  • The open-circuit voltage of each PV string must be 1100 V DC or lower under any circumstances.
  • The polarities of electric connections are correct on the DC input side. The positive and negative terminals of a PV module connect to corresponding positive and negative DC input terminals of the solar inverter.
  • Ensure that the PV module output is well insulated to ground.
  • The PV strings connecting to the same MPPT circuit should contain the same number of identical PV modules.
  • The solar inverter does not support full parallel connection for PV strings (full parallel connection: PV strings connect to one another in parallel outside the solar inverter and then connect to the solar inverter separately).
  • During the installation of PV strings and the solar inverter, the positive or negative terminals of PV strings may be short-circuited to ground if the power cable is not properly installed or routed. In this case, an AC or DC short circuit may occur and damage the solar inverter. The caused device damage is not covered under any warranty.

Terminal Description

The solar inverter has 20 DC input terminals. DC SWITCH 1 controls PV1–PV8 (MPPT1–MPPT4), DC SWITCH 2 controls PV9–PV14 (MPPT5–MPPT7), and DC SWITCH 3 controls PV15–PV20 (MPPT8–MPPT10).

Figure 5-20 DC terminals

When the DC input is not fully configured, the DC input terminals must meet the following requirements:

  1. Evenly distribute the DC input power cables on the DC input terminals controlled by the three DC switches. DC SWITCH 1 is preferred.
  2. Maximize the number of connected MPPT circuits.

For example, if the number of input routes is 1–19, the DC input terminals are selected as follows.

Number of PV Strings

Terminal Selection

Number of PV Strings

Terminal Selection

1

Any even-numbered route

2

PV2 and PV10

3

PV2, PV10, and PV18

4

PV2, PV6, PV10, and PV18

5

PV2, PV6, PV10, PV14, and PV18

6

PV2, PV4, PV6, PV10, PV14, and PV18

7

PV2, PV4, PV6, PV10, PV14, PV18, and PV20

8

PV2, PV4, PV6, PV8, PV10, PV14, PV18, and PV20

9

PV2, PV4, PV6, PV8, PV10, PV14, PV16, PV18, and PV20

10

PV2, PV4, PV6, PV8, PV10, PV12, PV14, PV16, PV18, and PV20

11

PV1, PV2, PV4, PV6, PV8, PV10, PV12, PV14, PV16, PV18, and PV20

12

PV1, PV2, PV4, PV6, PV8, PV10, PV12, PV14, PV16, and PV18–PV20

13

PV1–PV4, PV6, PV8, PV10, PV12, PV14, PV16, and PV18–PV20

14

PV1–PV4, PV6, PV8, PV10, PV12, PV14, and PV16–PV20

15

PV1–PV6, PV8, PV10, PV12, PV14, and PV16–PV20

16

PV1–PV6, PV8, PV10, PV12, and PV14–PV20

17

PV1–PV8, PV10, PV12, and PV14–PV20

18

PV1–PV8, PV10, and PV12–PV20

19

PV1–PV10 and PV12–PV20

N/A

N/A

Wiring Description of Y-branch Connectors

  • Y-branch connectors can be purchased from Huawei or the manufacturers based on the following recommended models: If the rated current of the fuse of the Y-branch connector is 15 A, the recommended model is 904095944 (Luxshare) or A040959443039 (Comlink); if the rated current of the fuse of the Y-branch connector is 20 A, the recommended model is 904095945 (Luxshare) or A040959453039 (Comlink).
  • Do not use Y-branch connectors that are not recommended.
  • When connecting cables to recommended Y-branch connectors, ensure that the connectors to be paired match each other and are from the same manufacturer. Otherwise, the contact resistance of the connectors may exceed the allowed value. In this case, the connectors may be heated and oxidized, which may cause faults.
  • When the Y-branch connector is used with the MC4 EVO2 contacts, you are advised to use the 32.6020-22100-HZ (Staubli) crimping tool. You can also use the PV-CZM-22100 (Staubli) crimping tool. When choosing PV-CZM-22100 (Staubli), do not use the locator. Otherwise, the metal contacts would be damaged.
  • Do not bind more than three fuse enclosures together. Otherwise, the fuses and their enclosures may be damaged due to overheating. It is recommended that a clearance of 10 mm or more be reserved between fuse enclosures. You are advised not to bind the fuse enclosures with other heat emitting conductors.
  • Do not place the Y-branch connector harness on the ground. A safe distance must be reserved between the Y-branch connector harness and the ground to avoid impact caused by water on the ground to the harness.
  • The DC input terminals of the solar inverter are prone to damage under stress. When Y-branch connectors are connected to the solar inverter, bind and secure the connectors to prevent the DC input terminals from bearing stress. For details, see Securing Y-Branch Connectors.
Cable connection rules:
  1. A maximum of one set of Y-branch connectors can be used for each MPPT. Each solar inverter can connect to a maximum of six sets of Y-branch connectors.
  2. The PV+ on the solar inverter side must be connected to the PV+ on the PV string side, and the PV– on the solar inverter side must be connected to the PV– on the PV string side.
  3. Preferentially and evenly connect the Y-branch connectors to the MPPTs controlled by DC SWITCH 2 or DC SWITCH 3.

    Number of Y-branch Connector Sets

    Recommended MPPT to Be Connected

    Number of Y-branch Connector Sets

    Recommended MPPT to Be Connected

    1

    MPPT9

    2

    MPPT7 and MPPT9

    3

    MPPT5, MPPT7 and MPPT9

    4

    MPPT5, MPPT7, MPPT9, and MPPT10

    5

    MPPT5, MPPT7, MPPT8, MPPT9, and MPPT10

    6

    MPPT5, MPPT6, MPPT7, MPPT8, MPPT9, and MPPT10

    Figure 5-21 Connecting Y-branch connectors to the solar inverter
    Figure 5-22 Connecting Y-branch connectors to the PV strings

Specification Requirements

Cables with high rigidity, such as armored cables, are not recommended, because poor contact may be caused by the bending of cables.

Use the Staubli MC4 connectors delivered with the solar inverter. If the PV connectors are lost or damaged, purchase the connectors of the same model. The device damage caused by incompatible PV connectors is beyond the warranty scope.

Procedure

  1. Prepare the DC input power cables.
  2. Crimp positive and negative metal contacts.
  3. Insert the contacts into the corresponding positive and negative connectors.
  4. Tighten the lock nuts on the positive and negative connectors.
  5. Use a multimeter to measure the voltage between the positive and negative terminals of the PV string (measurement range no less than 1100 V).
    • If the voltage is a negative value, the DC input polarity is incorrect and needs correction.
    • If the voltage is greater than 1100 V, too many PV modules configured to the same string. Remove some PV modules.
  6. Insert the positive and negative connectors into the corresponding DC positive and negative input terminals of the solar inverter.

    Figure 5-23 Connecting DC input power cables

    If the DC input power cable is reversely connected and DC switches are set to ON, do not immediately turn off the DC switches or reconnect the positive and negative connectors. Otherwise, the device may be damaged. The caused device damage is not covered under any warranty. Wait until the solar irradiance declines at night and the PV string current reduces to below 0.5 A. Then, turn off the three DC switches, remove the positive and negative connectors, and rectify the connection of the DC input power cable.

Translation
Download
Updated: 2019-12-25

Document ID: EDOC1100087908

Views: 5618

Downloads: 669

Average rating:
This Document Applies to these Products

Related Version

Related Documents

Share
Previous Next