4-2
Catalyst 4948E and Catalyst 4948E-F Switch Installation Guide
OL-21561-02
Chapter 4 Removal and Replacement Procedures
Removing and Installing the DC-Input Power Supply
Removing and Installing the DC-Input Power Supply This section describes how to remove and install the DC-input power supplies (PWR-C49-300DC) in the
Catalyst 4948E switch chassis and contains these subsections:
• Required Tools, page 4-2
• Removing the DC-Input Power Supply, page 4-2
• Installing the DC-Input Power Supply, page 4-5
Note The Catalyst 4948E-F chassis does not support the PWR-C49-300DC DC-input power supply.
Caution Installation of the equipment must comply with local and national electrical codes.
Caution Ensure that the DC return remains isolated from the system frame and the chassis (DC-I).
Note You can use the grounding lug to attach a wrist strap for ESD protection during servicing.
Warning
Before performing any of the following procedures, ensure that power is removed from the DC
circuits. To ensure that all power is removed, locate the circuit breakers or fuses on the DC power
lines that service the DC circuits. Turn OFF the DC power line circuit breakers and remove the DC
power line fuses.
Statement 322
Warning
When installing or replacing the unit, the ground connection must always be made first and
disconnected last.
Statement 1046
Required Tools
To perform this procedure, you will need a Number 2 Phillips screwdriver.
Removing the DC-Input Power Supply
To remove a DC-input power supply, follow these steps:
Step 1 Set the power switch/circuit breaker to the off (0) position on the circuit that feeds 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 Remove the clear plastic terminal block cover from the power supply terminal block.