Attaching Server And Component Power Cables; Determining And Balancing Current Draw On Two Circuits In One Rack - HP D5970A - NetServer - LCII Reference Manual

Chapter 3

Attaching Server and Component Power Cables

1. Make sure any manually switchable device power switches are off.
2. Attach the power cords for each device.
Plug power cords into the receptacle in the server.
Ensure sufficient cable to fully extend the server and route cables
through the Cable Management Arm.
Route the cables through the Cable Guide.
Tie bundles of cables using hook-and-loop cable straps.
3. Plug components into the PDU beginning with the components which are
lowest in the rack. If you are using more than one PDU or have a heavily
loaded rack, see the section of this chapter entitled "Determining and
Balancing Current Draw on Two Circuits in One Rack."
4. For the sake of easy access to the rear of each component, route the
associated power cords within the same space (the same set of EIA Units)
where the component is located.
Excess cord can be handled by coiling and tie wrapping unneeded length,
and hanging it in the space at the side of the component it connects. When
doing so, be sure you allow sufficient slack for access. Also provide for
components which can be extended, ensuring the coil does not conflict.
5. Plug the PDU(s) into the UPS or into the site power receptacles. When you
are ready to power on the components, see "Power Up Sequence."
Determining and Balancing Current Draw on Two Circuits in One
Rack
NOTE
Amperage ratings for use in determining and balancing loads
on the Power Distribution Unit are shown in Tables 2-6,
2-7, 2-8, and 2-9.
If applicable, use two circuits (each including a Power Distribution Unit and an
optional Uninterruptible Power Supply) in one rack. Attempt to balance the
current drawn through each circuit. Plan to plug in components with smaller
power requirements and connectors so that they alternate between the circuits. In
other words, plug one component into one circuit and the next component into the
other circuit. For instance, see Figures 3-8 and 3-9.
Procedure for Connecting and Routing Cables to the LC 2000r
35