
Chapter 2 Installing the Cisco MDS 9500 Series
Removing and Installing a Power Supply or PEM
Se n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a ck - d o c @ c i s c o . c o m .
Removing a DC Power Supply from the Cisco MDS 9509 Director
The DC power supply for the Cisco MDS 9509 Director is 2500 W.
Note The DC return connection to this system is to remain isolated from the system frame and chassis
Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
To remove a DC power supply from the Cisco MDS 9509 Director, follow these steps:
Step 1 Ensure that all power is off by locating the circuit breaker on the panel board that services the DC circuit. Switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.
Step 2 Remove the two screws securing the terminal block cover and slide the cover off the terminal block. (See Figure
Step 3 Disconnect the DC cables from the terminal block in the following order:
•Positive (+)
•Negative
•Ground
Caution The DC return connection (Negative
Warning When installing or replacing the unit, the ground connection must always be made first and disconnected last. Statement 1046
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