Monitoring the PDU

You can monitor how much current the equipment connected to the PDU uses by either checking the PDU’s LCD screen or by viewing the Current Measurement page using the HTML interface.

Monitor the PDU Using Metering Unit’s LCD Screen

You can check the current being used by equipment attached to the PDU by viewing the PDU’s metering unit LCD screen.

1. Locate PDU you want to monitor in the rack.

   You might need to open the rack’s rear door to access the PDU.

2. Locate the metering unit on the PDU.

   You can find the metering unit in the middle of the PDU.

3. Check metering unit’s LCD screen to view the current being used by the equipment connected to each PDU module.

   The LCD screen displays the amp measurements of all of the phases of a single PDU module (see Relationship Between Modules and Outlet Groups for a description of PDU modules).

   • If your PDU has more than one module, press the reset button to cycle through the available modules.
   • For easier viewing, you can rotate the screen in 90-degree intervals by pressing the reset button for longer than 1 second. (See Adjust the LCD Screen for more information.)
     

     Figure 5-5 Monitoring the PDU Using the Metering Unit’s LCD Screen

     

     Figure Legend

     1 Module numberLCD screenreading

     2 Measured amp reading of the current being used by the equipment connected to the PDU phase

     3 Abbreviation for amperes (amps)

     4 Metering unit phase number

Monitor the PDU Using the HTML Interface

Using the metering unit’s HTML interface, you can monitor the current being used by attached equipment. You can also see how these current readings relate to the threshold parameters you set in Setting Threshold Parameter Levels.

1. Access the PDU metering unit from a system on the network.

   See Accessing a Metering Unit on the Network. After accessing the PDU, the Current Measurement page displays.

2. View the Current Measurement page.

   Current Measurement Page shows an example Current Measurement page for a 37 kVA PDU, which has three modules with three phases each. (See Relationship Between Modules and Outlet Groups for a description of PDU modules.)

   
   

   Figure 5-6 Current Measurement Page

   

   Current Measurement of a PDU Module displays the details of a single PDU module.

   
   

   Figure 5-7 Current Measurement of a PDU Module

   

   Figure Legend

   1 PDU modulemonitoringModule number

   2 Out of Balance alarmsout of balancealarm out of balancealarm messagemessage

   3 Graph displaying the ampere measurementsamps of current being used per phase

   4 Number of amps of current being used per phase

   5 Table showing the threshold parametersmonitoringparameter settings ()

   If you set threshold parameter values (see Setting Threshold Parameter Levels), the module graph and current amp number are displayed in different colors, depending on how much current the attached equipment is using. See the following table for a description of these colors.

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   Note - If you do not set any threshold parameter values, all of the measurements are displayed in red.

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   Color Value Description Blue Measured current is below Info Low threshold. Attached equipment is not using enough current. Green Measured current is between the Info Low and Pre Warning thresholds. Attached equipment is using the proper amount of current. Yellow Measured current is above the Pre Warning threshold, but below the Alarm threshold. Attached equipment is beginning to use too much current. Red Measured current is above the Alarm threshold. Attached equipment is using too much current and requires immediate attention. Blinking red Measured current is above the Out of Balance threshold. Also, an blinking red “Out of Balance” message displays above the module graph. The equipment attached to one phase is using more current than the other phases on the module. The PDU and attached equipment require immediate attention.

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   Caution - If the PDU is out of balance, the PDU and the attached equipment might heat up and cause serious damage to the equipment, PDU, and the rack. Power off the equipment and the PDU immediately.

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