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