EMC AX4-5

Standby power sup
plies (SPSs)
A 1U, 1000-watt SP
S provides backup power for power supply A. An
optional second S
PS supports power supply B. During a power failure,
the SPSs allow wri
te caching to continue, which prevents data loss. A
faulted or not fu
lly charged SPS disables the write cache. Each SPS rear
panel has one AC i
nlet power connector with power switch, AC outlets
for the DPE-AX S
Ps, and one connector for serial connection to an SP.
Figure 8 shows t
he SPS connectors and status lights.
CL3881
AC power
connector
Power
switch
SP
interface
DPE-AX
Active
(green)
Replace
battery
(amber)
On battery
(amber)
Fault
(amber)
Figure 8 1000–watt S
PS connectors, power switch, and status lights
You can rep
lace an SPS while the storage system is powered up.
10
Hardware and Operational Overview