Connecting an 850 W DC Power Supply to the DC Source Voltage

The DC power connection at your facility must be made by a qualified electrician, following the instructions in this section.

Warning

Warning

Always make sure the DC circuit is de-energized before connecting or disconnecting the DC power cables on the power supply.
Caution

Caution

Provide proper connection and strain relief on the DC power cables in accordance with all local and national electrical codes.

To connect the DC power input cables:

  1. Verify that the DC circuit is de-energized.
  2. Slide the cover off the terminal block (see Connecting the DC Power Cables (Part 1)).
  3. Connect the DC power input cables as follows:
    1. On each terminal, loosen the screw enough to allow the spade terminal to slide underneath the captive square washer.
    2. Slide the spade terminal of the negative wire (–48 V) under the captive square washer on the negative terminal (labeled –48V).
    3. Slide the spade terminal of the positive wire (–48 V RTN) under the captive square washer on the positive terminal (labeled RTN).
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      Connecting the DC Power Cables (Part 1)
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    4. Tighten both screws on the terminal block to 11 in‑lb (1.2 N m).
  4. Slide the cover into place over the terminal block.
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    Connecting the DC Power Cables (Part 2)
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  5. Connect the cables to the DC source voltage, using hardware appropriate to the installation site and following local and national electrical codes.
  6. Energize the DC circuit.

Leave the ESD strap permanently connected to the rack, so that the strap is always available when you need to handle ESD-sensitive components.

You can now connect network interface cables to the switch, using the instructions in Connecting Network Interface Cables.