IBM pSeries 670, Руководство по установке

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Installing the Frame-Ground Straps
Install a frame-ground strap on all pSeries 670 systems if the following conditions are met:
v
A frame-ground strap is provided for installation.
AND
v
The customer provides a ground to which the frame-ground strap will attach.
Attention: It is recommended that all pSeries 670 systems that are installed in 7040 Model W42 racks,
be grounded. However, two frame-ground straps are required on a rack for a switched clustered
environment (for example, when in a scalable parallel (SP) Switch-2 connected clustered environment).
One frame-ground strap must be installed at the front bottom-left side of the rack, and the second
frame-ground strap must be installed at the rear bottom-left side of the rack.
Raised-Floor Environments
Raised-floor environments can be short-raised or long-raised floors. For additional information on site
planning for the system, refer to pSeries 670 information in Chapter 2 of the
Site and Hardware Planning
Information . The frame-ground straps provided with the system are intended for use with a grounded
raised floor. If the installation does not use a grounded raised floor, refer to the alternate grounding means
in the pSeries 670 information in Chapter 2 of the
Site and Hardware Planning Information .
Attention: If the site raised floor has pedestals that are not grounded, ask the customer to consult with a
certified electrical contractor to have the floor pedestals grounded, or refer them to pSeries 670 information
in Chapter 2 of the
Site and Hardware Planning Information for an alternate solution if the installation site
does not have a grounded raised floor.
To install the frame-ground straps on a rack in a grounded raised-floor environment, perform the following
steps.
1. Ensure that the raised-floor is grounded. A grounded-raised floor has pedestals that are connected with
ground wire so that an electrical ground can be installed from equipment to pedestals, and then to an
earth ground.
If the raised floor is not grounded, stop, and ask the customer to arrange to have the floor grounded,
and refer them to pSeries 670 information in Chapter 2 of the
Site and Hardware Planning Information .
If the raised floor is grounded, go to the next step.
2. If the rear door on the rack is not open, open the door.
3. To install a frame-ground strap at the front bottom-left side of the rack, do the following:
a. At the front bottom-left side of the rack, attach the lug end of the ground strap (part number
44P2814) to the ground connection symbol on the rack using a screw (part number 2665528) and
a lockwasher (part number 1623347, if supplied). Tighten the screw using an 8-mm nutdriver.
The ground strap can run alongside the rack power cord to exit the frame.
Note: Ensure that the lockwasher is installed between the frame surface and the ground-strap lug.
See the front view of the rack in the following illustration.
Appendix D. Securing the Rack
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