12 Installing the Hardware
  CAUTION: Remove the power cable from the modules prior to removing the 
module itself. Power must not be connected prior to insertion in the chassis.
  WARNING: Prevent exposure and contact with hazardous voltages. Do not 
attempt to operate this system with the safety cover removed.
  CAUTION: Be sure that the DC power source is turned OFF before attaching 
the cables to the DC connectors on the Z9000.
Install a New DC Power Supply
The power supply modules should slide into the slots smoothly. Do not force a 
module into a slot. This may damage the power supply or the Z9000 chassis.
Step Task
1 Take the power supply unit out of the shipping box.
2 Remove the small plastic cover over the DC cable connectors. Do not 
throw the cover away; you will replace it when installation is complete.
3 Ensure that the DC power source is turned OFF.
4 Using the grab handle, slide the unit into the power supply bay.
5 Tighten the securing screw on the side of the PSU.
6 Attach power cables.
7 Replace the small plastic cover over the DC cable connectors.
8 Turn the DC power source ON.