Power Cooling Module Replacement

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This section explains how the user can remove and replace a failed Power Cooling Module (PCM) for a appliance head unit or the EBOD enclosure. A Power Cooling Module comprises of two main parts - a power supply and cooling fans that are speed controlled via the Controller or the EBOD module.

If the power supply of the PCM fails, leave the faulty module installed but remove the power cord. The fan will continue to receive power from the enclosure and continue to provide proper cooling. If the fan fails, the PCM needs to be replaced immediately. 

Though the PCMs for the head unit and EBOD enclosure are different, the replacement procedure for both of these is identical. There is only one model of PCM qualified for each model enclosure (housing head unit or the EBOD enclosure). The head unit is certified for a 764W PCM whereas the EBOD enclsoure uses a 580W PCM. The two-step process of removing the faulty PCM and installing a known good PCM is discussed in detail in the following sections:

 

 Note.png Note: Prior to removing the PCM, please disconnect the power from the PCM, by either the mains switch (where present) or by physically removing the power source in order to ensure that your system has a warning of an imminent power shutdown.

Note.png Note: Ensure that the other PCM is functional for continued system operation prior to replacing the faulty PCM. A faulty PCM must be replaced by a fully operational PCM within 24 hours. PCM module replacement takes only few minutes for completion but must be completed within 10 minutes from the removal of the failed PCM to prevent overheating.

Note.png Note: Ensure that the other PCM is functional for continued system operation prior to replacing the faulty PCM.

Note.png Note: Ensure that the correct PCM is installed in the head unit or the EBOD enclosure. The head unit uses a 764W PCM whereas the EBOD enclosure needs to operate with a 580W PCM.

 

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Removing a PCM

Perform the following steps to remove the PCM from the head unit:

  • In Web UI, navigate to Manage  Hardware and look at the status of the components under 'Shared Components' to identify which PCM has failed, PCM 0 or PCM 1.

 

 WebUIPCMFail_1.png

 

  • If a power supply in PCM 0 has failed, the status of 'Power Supply 0' will be red (as shown in the figure above). If the fan has failed, the status of either the 'Cooling 0 for Power Supply 0' or the 'Cooling 1 for Power Supply 0' will be red.

  • Now locate the malfunctioning or failed PCM on the backplane of the head unit. If using a 7520, identify the head unit (from the EBOD enclosure) by looking at the System Unit Identification Number shown on the Front Panel LED display. The default Unit ID displayed on the head unit is '00' whereas the default Unit ID displayed on the EBOD enclosure is '01'. Refer to the diagram of the front panel of the LED display shown below.

 

OpsPanel_1.jpg

 

  • The monitoring indicator LEDs in the backplane of the head unit can also be used to determine the faulty PCM. See the diagram below for the head unit PCM to understand how to use the LEDs to locate the faulty PCM. If the LED corresponding to the 'Fan Fail' is lit, then the fan has failed. Likewise if the LED corresponding to 'AC Fail' is lit, then the power supply has failed. Note that the PCM from the EBOD enclosure will not have the two battery LEDs and hence will have the other four LEDs.

 

764W PCM_LEDs_1.png

 

  • Next, refer to the diagram of the appliance backplane shown below to locate the failed PCM module. The PCM 0 is on the left whereas PCM 1 is on the right in this position.

 

Appliance_PlugInModules_3S.png

 

  • Switch off the faulty PCM and disconnect the power supply cord. The PCM can now be removed.
  • Now, grasp the latch and the side of the PCM handle between thumb and forefinger, squeeze together and open the handle to cam the PCM out of the enclosure.

 

Removing_PCM_1a.png

 

  • Grip the handle and withdraw the PCM.

 

Removing_PCM_2a.png

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Installing a PCM

  • Verify that you have the correct PCM replacement, one that is qualified for this enclosure. For the head unit, the replacement should be a 764W PCM whereas the EBOD enclosure needs a 580W replacement. One easy way to do this is to look at the label affixed to the PCM as shown below.

 

764WPCMLabel.png

 

  • Check for damage, especially to all connectors - do not install the module if any connector pins appear to be bent.
  • With the PCM handle in the open position, slide the module into the enclosure.

 

Installing_PCM_1a.png

 

  • Cam the module home by manually closing the PCM handle. A click should be heard as the handle latch engages.
  • Connect the power cables to the power source and to the PCM.
  • Secure the strain relief bales. Switch on the PCM.
  • To finally verify that the replacement was successful, navigate to Manage Hardware in the Web UI. Under 'Shared Components', the status of the PCM should now be green as shown below.

 

WebUIPCMHealthy_1.png

 

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