4-12
Catalyst 4500 E-Series Switches Installation Guide
OL-13972-02
Chapter 4 Removal and Replacement Procedures
Removing and Installing the DC-Input Power Supplies
Warning
Use copper conductors only.
Statement 1025
Warning
When stranded wiring is required, use approved wiring terminations, such as closed-loop or
spade-type with upturned lugs. These terminations should be the appropriate size for the wires and
should clamp both the insulation and conductor.
Statement 1002
To install a DC-input power supply, follow these steps:
Step 1
Verify that power is off to the DC circuit on the power supply that you are removing. As an added
precaution, place the appropriate safety flag and lockout devices at the source power circuit breaker, or
place a piece of adhesive tape over the circuit breaker handle to prevent accidental power restoration
while you are working on the circuit.
Step 2
Grasp the power supply handle with one hand. Place your other hand underneath it as you slowly insert
the power supply into the bay (see
Figure 4-14
). Make sure that the power supply is fully seated in the
bay.
Step 3
Tighten the captive screws on the power supply (see
Figure 4-13
).
Step 4
Before you connect the power supply to a power source, ensure that all site power and grounding
requirements have been met.
Step 5
Remove the terminal block cover from the terminal block.
Step 6
Connect the source DC cables to the power supply terminal block. The proper wiring sequence is ground
to ground, positive to positive, and negative to negative (see
Figure 4-11
or
Figure 4-12
depending on
your installation).
The 1400W triple-input power supply has two grounding posts; use the one that is most convenient for
your installation.
Warning
When installing or replacing the unit, the ground connection must always be made first and
disconnected last.
Statement 1046
Step 7
After ensuring that all wire connections are secure, reinstall the terminal block cover.
Caution
In a system with multiple power supplies or a single triple-input power supply, connect each power
supply to a separate DC power source. In the event of a power source failure, if the second source is still
available, it can maintain maximum overcurrent protection for each power connection.
Step 8
Remove any safety flag and lockout devices or any tape from the source DC circuit breaker switch handle
and restore power by moving the circuit breaker switch handle to the on (|) position.
Step 9
Turn the power supply power switch to the on (|) position.
Step 10
Verify power supply operation by checking the power supply’s front-panel LEDs. You should see the
following:
•
The LED labeled INPUT OK is green.
•
The LED labeled OUTPUT FAIL is not lit.
