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SUN2000-(29.9KTL, 33KTL-A, 36KTL, 42KTL) User Manual

This document describes the SUN2000-(29.9KTL, 33KTL-A, 36KTL, 42KTL) in terms of their installation, electrical connections, commissioning, maintenance, and troubleshooting.
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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

Prerequisites

  • Before connecting DC input power cables, ensure that the DC voltage is within the safe range (lower than 60 V DC) and that the two DC switches on the SUN2000 are OFF. Otherwise, the high voltage may result in electric shocks.
  • When the SUN2000 is grid-tied, it is not allowed to maintain DC input power cables, such as connect or disconnect a string or a module in a string. Otherwise, electric shocks may occur.
Ensure that the following conditions are met. Otherwise, the SUN2000 will be damaged, or even a fire disaster will be caused.
  • The open-circuit voltage of each PV string is always lower than or equal to 1100 V DC.
  • The positive and negative terminals of a PV module connect to the positive and negative DC input terminals of the SUN2000 respectively.
  • If the DC input power cable is reversely connected, do not operate the DC switches and positive and negative connectors immediately. Wait until the solar irradiance declines at night and the PV string current reduces to below 0.5 A. Then, turn off the two DC switches, remove the positive and negative connectors, and correct the polarity of the DC input power cable.
  • Ensure that the PV module output is well insulated to ground. If the SUN2000 directly connects to the power grid with the neutral wire connected to the PE cable (for example, a low-voltage power grid or a power grid with the neutral wire grounded), do not ground the positive and negative terminals of PV strings. The device may be damaged if you do not follow the instruction. This damage is not covered under any warranty or service agreement.
  • During the installation of PV strings and SUN2000, the positive or negative terminals of PV strings may be grounded if power cables are not properly installed or routed. In this case, an AC or DC short circuit may occur and damage the SUN2000. The caused equipment damage is beyond the warranty scope.

Context

  • DC terminal selection

    Figure 5-15 shows the DC terminals at the bottom of the SUN2000. Table 5-3 describes the requirements for DC terminal selection.

    NOTE:

    The SUN2000 provides two DC switches, namely, DC SWITCH 1 and DC SWITCH 2. DC SWITCH 1 controls the first to the fourth routes of DC input terminals, while DC SWITCH 2 controls the fifth to the eighth routes of DC input terminals.

    Figure 5-15  DC terminals
    Table 5-3  DC terminal selection requirements

    Number of Inputs

    SUN2000

    1

    Connects to any route.

    2

    Connects to sets 1 and 5.

    3

    Connects to sets 1, 3, and 5.

    4

    Connects to sets 1, 3, 5, and 7.

    5

    Connects to sets 1, 2, 3, 5, and 7.

    6

    Connects to sets 1, 2, 3, 5, 6, and 7.

    7

    Connects to sets 1, 2, 3, 4, 5, 6, and 7.

    8

    Connects to sets 1, 2, 3, 4, 5, 6, 7, and 8.

  • DC input power cable specifications
    Table 5-4 lists the recommended DC input power cable specifications.
    Table 5-4  Recommended DC input power cable specifications

    Cable Type

    Conductor Cross-Sectional Area (mm2)

    Cable Outer Diameter (mm)

    Range

    Recommended Value

    Common PV cables in the industry (model: PV1-F)

    4.0–6.0 (or 12–10 AWG)

    4.0 (or 12 AWG)

    4.5–7.8

    Rigid cables, such as armored cables, are not recommended, because poor contact may be caused by the bending of the cables.

  • Positive and negative connectors
    DC input connectors are categorized into positive and negative connectors, as shown in Figure 5-16 and Figure 5-17.
    Figure 5-16  Positive connector

    (1) Insulation shell

    (2) Locking nut

    Figure 5-17  Negative connector

    (1) Insulation shell

    (2) Locking nut

Use the positive and negative metal contacts and DC connectors supplied with the SUN2000. Using other models of positive and negative metal contacts and DC connectors may result in serious consequences. The caused device damage is not covered under any warranty or service agreement.

Procedure

  1. Prepare positive and negative connectors.

    • The metal contacts supplied with the DC connectors are either cold forming contacts or stamping forming contacts. Choose the crimping tools that fit the metal contact types. Do not mix up the tools.
    • Crimp the metal cold forming contacts using crimping tool UTXTC0005 (Amphenol, recommended) or H4TC0001 (Amphenol).
    • Crimp the metal stamping forming contacts using crimping tool H4TC0003 (Amphenol, recommended), H4TC0002 (Amphenol), PV-CZM-22100 (Staubli), or PV-CZM-19100 (Staubli). When choosing PV-CZM-22100 or PV-CZM-19100, do not use the locator. Otherwise, metal contacts would be damaged.
    Figure 5-18  Crimping tool (H4TC0003)

    (1) Locator

    Figure 5-19  Preparing positive and negative connectors (using metal cold forming contacts)

    (1) Positive metal contact (cold forming)

    (2) Negative metal contact (cold forming)

    (3) Positive connector

    (4) Negative connector

    Figure 5-20  Preparing positive and negative connectors (using metal stamping forming contacts)

    (1) Positive metal contact (stamping forming)

    (2) Negative metal contact (stamping forming)

    (3) Positive connector

    (4) Negative connector

    After the positive and negative metal contacts snap into place, pull the DC input power cables back to check that they are connected securely.

  2. Pull out the blue dustproof plugs from the ends of the DC input connectors.
  3. Ensure that the DC input voltage of each PV string does not exceed 1100 V DC using a multimeter and check that the polarities of the DC input power cables are correct.

    Figure 5-21  Measuring the DC input voltage

    Before performing 4, ensure that the two DC switches are OFF.

  4. Insert the positive and negative connectors into the corresponding positive and negative DC input terminals of the inverter until they snap into place, as shown in Figure 5-22.

    After the positive and negative connectors snap into place, pull the DC input power cables back to ensure that they are connected securely.

    Figure 5-22  Connecting DC input power cables

    If the DC input power cable is reversely connected, do not operate the DC switches and positive and negative connectors immediately. Otherwise, the SUN2000 will be damaged. The caused equipment damage is beyond the warranty scope. Wait until the solar irradiance declines at night and the PV string current reduces to below 0.5 A. Then, turn off the two DC switches, remove the positive and negative connectors, and correct the polarity of the DC input power cable.

Follow-up Procedure

Before removing the positive and negative connectors, ensure that the two DC switches are OFF.

To remove the positive and negative connectors from the SUN2000, insert a removal wrench into the notch and press the wrench with an appropriate force, as shown in Figure 5-23.
Figure 5-23  Removing a DC input connector
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Updated: 2019-08-02

Document ID: EDOC1100019925

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