Connecting a 450 W or 550 W DC Power Supply to the Source Voltage

Summit 450 W or 550 W DC power supply units must connect to a –48V source.

The DC power connection at your facility must be made by a qualified electrician, following these instructions.

Warning

Warning

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

Caution

Provide proper connection and strain relief on the DC power cables in accordance with all local and national electrical codes.
  1. Verify that the DC circuit is de-energized.
  2. Attach an ESD-preventive wrist strap to your bare wrist and connect the metal end to an appropriate ground point on the rack.
  3. Slide the cover off the terminal block.
  4. On each terminal, loosen the screw enough to allow the spade terminal to slide underneath the captive square washer.
  5. Connect the DC power input cables as follows:
    1. Slide the spade terminal of the negative wire (–48 V) under the captive square washer on the negative terminal (labeled ).
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      Connecting the Negative Power Wire to a –48V Source (450 W or 550 W DC Power Source)
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    2. Slide the spade terminal of the positive wire (–48 V RTN) under the captive square washer on the positive terminal (labeled +).
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      Connecting the Positive Power Wire to a –48V Source (450 W or 550 W DC Power Source)
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  6. Tighten both screws on the terminal block to 7 in‑lb (0.79 N m).
  7. Snap the cover into place over the terminal block.
  8. Connect the cables to the DC source voltage, using hardware appropriate to the installation site and following local and national electrical codes.
  9. 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.