Step 7. To return power to the 7133:
a. Reinstall the power cables
4
.
b. Ensure that both power supply assemblies are switched on (that is, the
PWR/FAULT RESET switch
5
of each power supply assembly is pointing
to the left). To switch on a power supply assembly, push the PWR/FAULT
RESET switch leftward.
Note: On early power supply assemblies, pull the switch outward, then
push it leftward.
c. Press and release the Power switch.
Note: The 7133 Models D40 and T40 have no power sequencing. All the disk
drive modules start their power sequence when the input voltages are
inside the specified limits. Their motors are started under control of the
SSA attachments in the using system. To prevent the need for
excessive electrical current, the disk drive module motors are not all
started together. Up to eight disk drive modules can be started together.
At least 10 seconds must elapse before the next group of motors is
started. Normally, all the disk drive module motors are running in less
than 30 seconds from the time the 7133 is switched on.
Chapter 3. Removal and Replacement Procedures
149
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