Huawei DCDU-12B DC power distribution unit

$78.00 $48.00

Brand: Huawei

Model:  DCDU-12B

Detail: Huawei DCDU-12B DC power distribution unit 1U 19inch cabinet 48V25A Huawei BBU RRU

Condition: 100% New

Availability: IN STOCK

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Huawei DCDU-12B DC power distribution unit

This chapter describes the procedure and precautions for replacing the components in a DCDU-12B that is used in a BTS3012AE (Ver.D_Z) cabinet.

When the BTS3900 or BTS3900L is configured with both RFUs and RRUs, the DCDU-12B feeds DC power only to RRUs. This section describes the procedure for replacing a DCDU-12B

 

Replacing a DCDU-12B (BTS3012AE)

This chapter describes the procedure and precautions for replacing the components in a DCDU-12B that is used in a BTS3012AE (Ver.D_Z) cabinet.

Prerequisites

  • The following tools and materials are available: an ESD wrist strap or a pair of ESD gloves, a flat-head screwdriver, a Phillips screwdriver, a torque screwdriver, and an ESD box or bag.
  • The type of a component to be replaced is confirmed by following the instructions in Querying the Electronic Label of the Cabinet, and a new component is available.
  • The new component is intact, and its hardware version is the same as that of the component to be replaced.
  • Associated personnel have gained permission to access a site and have obtained the required key.

Context

  • When a DCDU-12B is used in a BTS3012AE, replacing the DCDU-12B interrupts all the services carried by the BTS3012AE.
  • When a DCDU-12B supplies power only to RRUs, replacing the DCDU-12B interrupts all the services carried by the RRUs.
  • It takes about 20 minutes to replace a DCDU-12B.
  • The following figure shows the position of a DCDU-12B in a cabinet.
Figure 1 Position of a DCDU-12B in a Cabinet

Procedure

  1. Put on an ESD wrist strap or a pair of ESD gloves.
     NOTICE:

    Take proper ESD protection measures, for example, put on an ESD wrist strap or a pair of ESD gloves, to prevent electrostatic damage to the boards, modules, or other electronic components.
  2. Optional: In AC power supply scenarios, remove the connector on the power cable from the RFC2 output port on the EPU to power off the DCDU-12B. In DC scenarios, shut off the external power supply.
  3. Label the cables connected to output ports on the DCDU-12B panel, and disconnect the cables.
  4. Use a Phillips screwdriver to remove the protection hood from the external wiring terminal block of the DCDU-12B, as shown in the following figure.
    Figure 2 Removing the protective cover for the DC input wiring terminal block from the DCDU-12B
  5. Label the external input power cable for the DCDU-12B, and disconnect the cable.
  6. Use a Phillips screwdriver to remove the four M6x12 screws from both sides of the DCDU-12B, and pull the DCDU-12B out of the cabinet along the guide rails gently, as shown in the following figure.
    Figure 3 Removing the DCDU-12B
  7. Place the new DCDU-12B on the installation position, and push it into the cabinet along the guide rails. Use four M6x12 screws on both side of the DCDU-12B to secure the DCDU-12B to 2 N·m (17.7 lbf·in.).
  8. Remove the protective cover for the DC input wiring terminal block from the new DCDU-12B, reconnect the power cables to the new DCDU-12B according to the record, and then reinstall the protective cover.
  9. Reinstall the connectors to the new DCDU-12B according to the record.
  10. Optional: In AC scenarios, reconnect the connector on the power cable to the RFC2 output port on the EPU to power on the DCDU-12B. In DC scenarios, switch on the external power supply.
  11. Check the status of the RRU indicators to determine whether the fan assembly in the front door works properly. For details about the status of the indicators, see CMUEA.

Follow-up Procedure

  • Place the replaced component into an ESD box or bag. Then, place the ESD box or bag into a foam-padded carton or the packing box of the new module.
  • Fill in the fault form with detailed information about the replaced component.
  • Contact the local Huawei office to handle the faulty component.

Replacing a DCDU-12B (BTS3900/BTS3900L)

When the BTS3900 or BTS3900L is configured with both RFUs and RRUs, the DCDU-12B feeds DC power only to RRUs. This section describes the procedure for replacing a DCDU-12B.

Prerequisites

  • The following tools and materials are available: an ESD wrist strap or a pair of ESD gloves, a flat-head screwdriver, a Phillips screwdriver, a torque screwdriver, and an ESD box or bag.
  • The type of a component to be replaced is confirmed by following the instructions in Querying the Electronic Label of the Cabinet, and a new component is available.
  • The new component is intact, and its hardware version is the same as that of the component to be replaced.
  • Associated personnel have gained permission to access a site and have obtained the required key.

Context

  • Replacing a DCDU-12B interrupts all services carried by RRUs.
  • Replacing a DCDU-12B takes about 20 minutes.
  • A DCDU-12B is installed in different positions in the BTS3900 (Ver.D) DC and BTS3900 (Ver.D) AC cabinets, but in the same position in the BTS3900L (Ver.D) DC and BTS3900L (Ver.D) AC cabinets, as shown in Figure 1. The procedures for replacing DCDU-12B in the cabinets are the same. This section uses the DCDU-12B in the BTS3900 (Ver.D) DC cabinet as an example.
Figure 1 Position of the DCDU-12B

Procedure

  1. Put on an ESD wrist strap or a pair of ESD gloves.
     NOTICE:

    Take proper ESD protection measures, for example, put on an ESD wrist strap or a pair of ESD gloves, to prevent electrostatic damage to the boards, modules, or other electronic components.
  2. Modify the administrative state and block all RRUs powered by the DCDU to be replaced. For detailed operations, see RRU Hardware Maintenance Guide.
  3. Turn off the DCDU circuit breaker on the external power device.
  4. Label the cables connected to output ports on the DCDU-12B panel, and disconnect the cables.
     NOTE:

    To remove an EPC4/EPC5 connector, do as follows: Use your right hand to push the connector inward and left hand to drag the puller on the connector to unlock the latch of the connector. Then pull the connector out from the port.

  5. Use a Phillips screwdriver to remove the protective cover from the external terminal block of the DCDU-12B.
  6. Label the external input power cable for the DCDU-12B, and disconnect the cable.
  7. Remove the two M6x12 screws from each mounting ear on the DCDU-12B and remove the DCDU-12B, as shown in the following figure.
    Figure 2 Removing the DCDU-12B
  8. Install a new DCDU-12B into the position where the original one is located, and use the four removed M6x12 screws to secure the DCDU-12B to the subrack.
  9. Insert the OT terminal of the power cable into the corresponding cable hole in the wiring terminal block. Connect the OT terminal on the blue wire to the NEG(-) terminal and the OT terminal on the black wire to the RTN(+) terminal.
  10. Reinstall the protective cover, and use a screwdriver to tighten the screws.
  11. Reconnect the removed cables to the ports on the panel of the new DCDU-12B based on cable connection records.
  12. Turn off the DCDU-12B circuit breaker on the external power device.
  13. Check the indicators on the RRUs according to the following table to verify that these RRUs are properly powered by the DCDU-12B.

    Table 1 Maintenance checklist
    Item Normal Status
    Indicators on the RRU panel
    • RUN indicator: blinking (on for 0.125s and off for 0.125s or on for 1s and off for 1s)
    • ALM indicator: steady off
  14. Take off the ESD wrist strap or ESD gloves, and pack up all tools.

Follow-up Procedure

  • Place the replaced component into an ESD box or bag. Then, place the ESD box or bag into a foam-padded carton or the packing box of the new component.
  • Complete the fault form with detailed information about the replaced component.
  • Contact the local Huawei office to handle the faulty component.

Model: DCDU-12B

Detail: Huawei DCDU-12B DC power distribution unit 1U 19inch cabinet 48V25A Huawei BBU RRU

Availability:  IN STOCK

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