IBM 4957-J10, Manual

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d. Remove the enclosure until it reaches the hard stops (approximately 400mm) and tighten the
mounting screws in the front rack bracket.
e. Return the enclosure to the fully home position.
Power cord connection
Connect the power cord(s) to the power distribution unit(s) (PDUs), as shown in the following figure.
Important: When more than one PCM is fitted, all power cords must be connected to at least two
separate and independent supplies to guarantee redundancy.
CAUTION: Always remove the power connections before you remove the PCM from the enclosure.
Figure 16. Typical AC Power Cable Connections to PCMs
Important: The small disk enclosure is fitted with two redundant PSUs. All power cords must be
connected to at least two separate and independent power supplies to ensure redundancy.
• The figure above shows the power connection from a single-core PSU to a PDU using C19 connectors.
• The C14 plug on the PSU connects to the C13receptacle of the power cord. The C14 plug on the power
cord connects to the C13 receptacle in the PDU.
CAUTION: Power connection concerns:
• Never connect the power cord to the PSU before installing the PSU in the system.
• Always remove the power connections before you remove the PSU from the enclosure.
• Standard (single-lead) power cords must only be connected to a supply range of 100–240V AC
as indicated on each PSU’s hazardous voltage warning label.
Testing enclosure connections
See the section Powering on/powering off. Once the power-on sequence succeeds, the storage system is
ready to be connected.
Grounding checks
The product must only be connected to a power source that has a safety electrical earth connection.
Warning: If more than one 2U enclosure goes in a rack, the importance of the earth connection to
the rack increases, because the rack will have a larger “EARTH LEAKAGE CURRENT” (“TOUCH
CURRENT”).
Examine the earth connection to the rack before the switch on: an electrical engineer who is qualified to
the appropriate local and national standards must do the examination.
System configurations
The basic configuration is a single IBM COS Small Disk Enclosure connected to a single IBM COS
Controller Node
18 IBM Cloud Object Storage System: IBM Small J10 Disk Enclosure Manual