- IBM switch Users and Maintenance Guide

to “Turning off the storage server” on page 67 and follow the procedure described
there before replacing the power supply on a DS4100 single-controller storage
server.
Each power supply CRU has a built-in sensor that detects the following conditions:
v Over-voltage
v Over-current
v Overheated power supply
If
any of these conditions occurs, one or both power supplies will shut down. All
power remains off until you cycle the power switches (turn the power switches off,
wait at least 30 seconds, then turn the power switches on). For more information,
see “Restoring power after an unexpected shutdown” on page 68 and “Restoring
power after an over-temperature shutdown” on page 69.
The power supplies are customer replaceable units (CRUs) and do not require
preventive maintenance.
v Always keep the power supplies in their proper places to maintain proper
controller-unit cooling.
v Use only the supported power supplies for your specific storage server.
The
power-supply controls on the rear of the storage server are shown in Figure 66.
Levers
Use these locking handles to remove or install a power supply.
Power LED
These green LEDs light when the storage server is turned on and receiving
ac power.
Fault LEDs
These amber LEDs light if a power supply failure occurs or if the power
supply is turned off.
AC power switches
Use these switches to turn the power supplies on and off. You must turn on
both switches to take advantage of the redundant power supplies.
AC power
switch
AC power
switch
Power LED
Power LED
Fault LED
Fault LED
Lever
Lever
AC power
connector
AC power
connector
Hot-swap power
supplies
Strain-
relief clamp
Strain-
relief clamp
f10ug023
Figure 66. Power supply controls
90 IBM TotalStorage DS4100 Storage Server: Installation, User’s, and Maintenance Guide