Replacing a Power Module (for a SAS Disk Enclosure)

Prerequisites

• The spare part is on hand.
• The power module that you want to replace has been located.

You can locate a component in either of the following ways:

• Locating a component based on alarms in DeviceManager: On the Alarms and Events page of DeviceManager, view the help information and determine the ID of the component to be replaced. Then locate the component at your site based on its ID.
• Locating a component based on the status of its Running/Alarm indicator: For details about the indicators on different components, see "Indicator Introduction" of each component in the Product Description specific to your product model and version.

Precautions

• Do not touch the connectors of a power module and a power cable.
• Remove and insert a power module with even force. Excessive force may damage the appearance of the power module or cause faults.
• Remove only one power module at a time.
• A power module must be replaced within three minutes. Otherwise, the system heat dissipation is compromised.

Tools and Materials

• ESD wrist strap
• ESD bag
• Labels
• Phillips screwdriver

Procedure

The procedure for replacing the power module of a 2 U SAS disk enclosure is the same as that for replacing the power module of a 4 U SAS disk enclosure. This section describes how to replace the power module of a 4 U SAS disk enclosure.

1. Perform a pre-replacement check.
   Check whether there is a redundant power module and whether the Running/Alarm indicator of the redundant power module is steady green, as shown in Figure 7-67. For details about the indicators on different components, see "Indicator Introduction" in the Product Description of the corresponding model.

   Figure 7-67 Running/Alarm indicator on a power module
   

   You can perform replacement only when a redundant power module exists and the redundant power module is working properly.

2. Wear an ESD wrist strap.
3. Remove the power cable.
   • Remove the AC power cable.
   1. Loosen the retention clip, as shown in step 1 in Figure 7-68.
      Figure 7-68 Removing the AC power cable
      

   2. Pull up the retention clip, as shown in a of step 2 in Figure 7-68.
   3. Remove the AC power cable, as shown in b of step 2 in Figure 7-68.
   • Remove the DC power cable.
   1. Turn off the circuit breaker that connects to the DC power module.
   2. Remove the protective cover on the DC power module, as shown in step 1 in Figure 7-69.
      Figure 7-69 Removing the DC power cable
      

   3. Unfasten the screws of the DC power cable with the Phillips screwdriver, remove the shock absorption sheets, washers, and OT terminal round holes, as shown in step 2 in Figure 7-69.

      When unfastening the screws from the DC power cable, prevent the shock absorption sheets and washers from sliding off.

   4. Install the protective cover on the DC power module, as shown in step 3 in Figure 7-69.

4. Press the latch on the power module to release the handle and pull out the power module, as shown in Figure 7-70.
   Figure 7-70 Removing an AC power module
   

5. Put the removed power module into an ESD bag.
6. Take the spare part out of its ESD bag.
7. Open the handle of the spare part, insert the spare part into the empty slot, and close the handle, as shown in Figure 7-71.
   Figure 7-71 Installing the AC power module
   

8. Insert the power cables.
   • Secure the AC power cables with retention clips.
   1. Press the locker of the retention clip outwards (as shown in a of step 1 in Figure 7-72), and meanwhile slide the retention clip to the connection part of the AC power cable (as shown in b of step 1 in Figure 7-72).
      Figure 7-72 Securing the AC power cables with retention clips
      

   2. Loosen the retention clip, as shown in step 2 in Figure 7-72.
   3. Press the retention clip inwards to secure the connection part of the AC power cable, as shown in step 3 in Figure 7-72.

   Adjust the retention clip to ensure that it holds the AC power cable tightly.

   • Connect the DC power cables.
   1. Remove the protective cover on the DC power module, as shown in step 1 in Figure 7-73.
      Figure 7-73 Connecting the DC power cable
      

   2. Unfasten the screws of the DC power cable using the Phillips screwdriver, put the screws through the shock absorption sheets, washers, and OT terminal round holes in sequence, connect the OT terminal of the black cable to the RTN (+) end, and the OT terminal of the blue cable to the NEG (-) end, and then fasten the screws, as shown in step 2 in Figure 7-73.
      • When unfastening the screws from the DC power cable, prevent the shock absorption sheets and washers from sliding off.
      • In some users' equipment rooms, the colors of DC power cables that connect to the anode and cathode of the DC power supply may differ from the colors specified here.
   3. Install the protective cover on the DC power module, as shown in step 3 in Figure 7-73.
   4. Turn on the circuit breaker that connects to the DC power module.

9. Wait about two minutes and check the status of the Running/Alarm indicator on the power module to determine whether the power module has been successfully installed. Figure 7-74 shows the location of the Running/Alarm indicator.
   • If the indicator is steady green, the power module has been successfully installed.
   • If the indicator is blinking green, the power input is normal but the disk enclosure is powered off.
   • If the indicator is steady yellow or off, the newly installed power module is faulty or the power module slot is faulty.
   Figure 7-74 Running/Alarm indicator on a power module
   

10. Confirm the replacement.

    After the preceding procedure is complete, check services on the host for storage-related errors. If any storage-related error is reported, contact Huawei technical support.

Follow-up Procedure

After the power module is replaced, label it to facilitate subsequent operations.