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Perform the following to cable the power cords:
1. Connect the power cord to the power supply.
2. Remove the nut that holds the power cable strain-relief clamp, and then remove
the strain-relief clamp.
3. Wrap the strain-relief clamp around the power cord approximately 20 cm (8 in.)
from the power supply connection end. Leave some slack between the clamp
and the power-supply end of the power cord.
4. Replace the power cable strain-relief clamp, and tighten it securely with the nut.
5. Plug the power cord into a properly grounded electrical outlet.
Note: To maintain power redundancy, plug the storage subsystem’s right and
left power supplies into two independent external power circuits through
ac distribution units inside a rack cabinet or directly into external
receptacles. Similarly, the right and left power supplies of the DS4000
storage expansion enclosures attached to the DS4500 should be plugged
into the same two independent external power circuits as the DS4500.
It is recommended that you determine the maximum surge current
possible when all devices in the power circuit are started at the same
time. Based on the total number of devices on a power circuit, find the
maximum (worst-case) specification value in order to prevent the circuit
from tripping. When both power supplies are connected and the storage
subsystem is powered on, each power supply unit will handle
approximately one-half of the current load. If there is only one power
supply unit, it will handle all of the current load. To ensure maximum
protection against power loss due to power supply unit failure or a power
circuit tripping, both power supply units must be connected and powered
on. See “Electrical requirements” on page 16 for the DS4500 AC power
requirements.
Figure 84. Connecting the power cords
112 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide