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SUN2000-(50KTL, 60KTL, 65KTL)-M0 User Manual

This document describes the SUN2000-50KTL-M0, SUN2000-60KTL-M0 and SUN2000-65KTL-M0 in terms of its 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

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 two DC switches on the SUN2000 are OFF. Failing to do so may result in electric shocks.
  • When the SUN2000 is grid-tied, it is not allowed to work on DC circuit, such as connecting or disconnecting a PV string or a PV module in a PV string. Failing to do so may cause electric shocks or arcing (which may further cause fire).
Ensure that the following conditions are met. Otherwise, the SUN2000 will be damaged, or even become a fire hazard.
  • 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 string are connected to corresponding positive and negative DC input terminals of the SUN2000.
  • 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.
  • During the installation of PV strings and SUN2000, the positive or negative terminals of PV strings may be short-circuited to ground 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.

Terminal Description

The SUN2000 provides 12 DC input terminals, among which terminals 1 to 6 are controlled by DC switch 1 and terminals 7 to 12 are controlled by DC switch 2.

Figure 5-15 DC terminals

Select DC input terminals according to the following rules:

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

Cable Specifications

Cable Type

Conductor Cross-Sectional Area (mm2)

Cable Outer Diameter (mm)

Range

Recommended value

PV cable that meets the 1100 V standard

4.0–6.0 (12–10 AWG)

4.0 (12 AWG)

4.5–7.8

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

Procedure

  1. Prepare positive and negative connectors.

    Use the Amphenol Helios H4 PV connectors provided with the SUN2000. If the terminals are lost or damaged, purchase the PV connectors of the same model. The device damaged caused by incompatible PV connectors is not covered under any warranty or service agreement.

    • 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 5-16 Crimping tool

    (1) Locator

    Figure 5-17 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 5-18 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 terminals snap into place, pull the DC input power cables back to ensure that they are connected securely.

  2. Use a multimeter to measure the DC voltage between the positive and negative of the PV string and confirm the string polarity.

    The DC voltage measurement range of the multimeter must be at least 1100 V.

    Figure 5-19 Measuring voltage
    • If the voltage is a negative value, the PV string is of reversed polarity. Correct before connecting this string to the SUN2000.
    • If the voltage is greater than 1100 V, too many PV modules are configured to the same string. Remove some PV modules.

  3. Pull out the blue dustproof plugs from the ends of the DC input connectors.

    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 SUN2000 until they snap into place.

    After the positive and negative connectors snap into place, pull test to the DC input power cable is recommended.

    Figure 5-20 Connecting DC input power cables

    If polarity of the DC input power cable is reversed and the DC switch is ON, do not turn off the DC switch immediately or unplug positive and negative connectors. The device may be damaged if you do not follow the instruction. The caused equipment damage is beyond the warranty scope. Wait until the solar irradiance declines and the PV string current reduces to below 0.5 A, and then turn off the two DC switches and remove the positive and negative connectors. Correct the string polarity before reconnecting the string to the SUN2000.

Updated: 2019-10-12

Document ID: EDOC1100016052

Views: 7956

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