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Installing Frame Ground Straps
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).
Note: You were originally instructed to install a frame-ground strap to the front and rear of the rack when
you were working with a switched clustered environment; however, it is now recommended to install
the ground straps to both sides at the rear of the rack. See "Raised-Floor Environments."
Signal Integrity
System reliability can be adversely affected by the presence of transient electrical noise that may be
conducted on power, signal, and control cables. To conduct high-frequency-electrical noise away from the
system, the ground path must be as short as possible. All systems are provided with ground straps that
are intended for use with stringer/stanchion-type raised floors (or other grounded types). The ground
straps are required if your servers are connected to a 9076 SP Switch2 clustered environment, and it is
recommended for all other configurations.
Raised-Floor Environments
Raised-floor environments can be low-raised or high-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, see the information about 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. If the installation site does not have a
grounded raised floor, refer the customer to the pSeries 670 information in Chapter 2 of the Site and
Hardware Planning Information for an alternate solution.
Note: Two frame ground straps are required at the rear of the rack. Both frame ground straps must be
installed on the frame of the rack and at the bottom of the rack.
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 an electrical ground can be installed from equipment to pedestals, and then to an earth
ground.
If the raised floor is not grounded, stop. Ask the customer to arrange to have the floor grounded, and
to see 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 rear bottom left side of the rack, do the following:
a. At the rear 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 starwasher (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: If a starwasher is supplied, ensure that the starwasher is installed between the frame
surface and the ground strap lug.
Appendix D. Securing the Rack
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