User's Manual

3-20
Cisco Catalyst 4900M S witch Inst allati on Guide
78-18350- 0 2
Chapter 3 Installing the Swi tch
Removing and Replacing the Power Supply
Warning Blank faceplat es and c over panels serv e thre e import ant fun ction s: th ey prev ent ex posur e to
hazardous voltages and c urren ts insi de the ch assis; they c ontain electro magnetic inter ferenc e (EMI)
that might disrup t othe r equipm ent; an d they d irect t he flow o f coo ling ai r thro ugh the c hassi s. Do not
operate the system unless al l cards, facepl ates, front cov ers, and rear cover s are in place.
Statement 1029
Step 6 If the power supply bay is to remain empty, install a blank power supply filler plate over the opening.
Secure the filler plate with the two mounting screws and tighten them with a screwdriver.
Installing a Power Sup ply
Warning The plug-socket combi nation m ust b e acce ssible at all time s, b ecause i t serv es as the m ain
disconnecting de vice. Statemen t 101 9
Follow these steps to install a power supply:
Step 1 Make sure that the power s upply you are in stalling is not connected to a power source and that a power
cord is not c onnecte d to th e power supply.
Step 2 Loosen the two Phillips-head screws from the power supply filler plate (if a filler plate is present).
Step 3 Remove the power supply filler plate (if one is present) and set it aside.
Caution Use both hands to g rasp a power s upply.
Step 4 Grasp a power supply ha ndle w ith one ha nd. Pla ce your other ha nd undern eath to sup port t he bott om of
the power supply.
Step 5 Slide the power supply almost all the way into the power supply bay. Press with both thumbs evenly to
correctly seat th e power supply into the conn ections inside.
Step 6 Using a screwdriver, tighten the two captive installation screws on the front panel of the power supply.
Step 7 Make sure the power supply power switch is in the off position (O ).
Step 8 Before you connect the power supply to a power source, ensure that all site power and grounding
requirements have been met.
Step 9 Plug the power cord or cords into the power supply.
Step 10 Connect the other end of the power cord to a power input sour ce.
Caution In a system with multiple power supplies, connect each power supply to a separ ate 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.