Instruction manual

5. Adding and Replacing Optional Modules
127
NOTE
Use a screwdriver to tighten the screws. Make sure the screws are
firmly tightened.
Step 3
Connect a power cable to the power supply unit. (For details about how to connect a
power cable, see
4.6 Connecting and disconnecting the power cable.)
5.4.2 Adding or replacing a DC power supply unit
(1) Removing a DC power supply unit
NOTE
If the power supply is redundant, a DC power supply unit can be
removed while the Switch is on.
If the power supply is not redundant, turn off the Switch before
removing the DC power supply unit.
Step 1
Set the circuit breaker of the power supply unit you are replacing to OFF.
Figure 5-12 Turning off the power
(1) Circuit breaker
(2) Power supply unit
Step 2
Set the circuit breaker of the power supply facility to OFF to turn off the power.