50
Power supply units
D1012/D1024 enclosures feature two redundant AC power supplies.
IMPORTANT:
AC power supply units do not have power switches. These PSUs power on when connected
to a power source, and power off when disconnected.
AC PSU
Enclosures configured with AC PSUs that do not have a power switch rely on the power cord for power
cycling. Connecting the cord from the PSU power cord connector to the appropriate power source
facilitates power on; whereas disconnecting the cord from the power source facilitates power off.
Figure 34
AC PSU
Powering off the PSU
1.
Stop all I/O from hosts to the enclosure (see
TIP:
This step is
not
required for hot-swapping; however, it is required when replacing both PSUs.
2.
Use management software to shut down any other system components necessary.
TIP:
This step is
not
required for hot-swapping; however, it is required when replacing both PSUs.
Given that power switch shut-off does not apply to this particular power supply model, proceed to
disconnecting the AC power cord.
Disconnecting an AC power cord
1.
Disconnect the power cord’s male plug from the power source.
2.
Disconnect the power cord’s female plug from the power cord connector on the PSU.
NOTE:
on page 52 for an illustration showing AC power cord
connection/disconnection.
Removing a power supply unit
1.
If replacing a single power supply module via hot-swap, proceed to step 3.
2.
If replacing both power supply modules, verify that the enclosure is powered off.
3.
Verify that the power cord is disconnected.
4.
Turn the thumbscrew at the top of the latch counterclockwise to loosen and disengage it from the
module; however, do not remove the thumbscrew from the latch.
Power cord connect
