Int-Pip7 Electromagnetic Interference (Emi); Int-Pip8 Grounding - IBM iSeries Series Hardware Problem Analysis And Isolation

1. Check for the following on the system:
v There must be no more than 11 connector breaks in a twinaxial cable run.
v Station protectors must be installed (in pairs) where a cable enters or leaves a building.
v There can only be two station protectors for each twinaxial run.
v There is a maximum of seven devices (with addresses 0-6) for each cable run.
v There is a maximum cable length of 1524 meters (5000 feet) for each port.
v All cable runs must be ended (terminated).
v Disconnect all twinaxial cables that are not used.
v Remove any cause of electrical noise in the twinaxial cables.
v All workstations must be grounded.
2. See chapter 9 in the iSeries Technical Information Manual SY44-0008, and use it to check for any
cable problems.
3. For more information, see the IBM 5250 Information Display Systems — Planning and Site Preparation
Guide, GA21-9337.
This ends the procedure.
INT-PIP7 Electromagnetic interference (EMI): For use by authorized service providers.
Use this procedure to lessen the effects of electrical noise on the system.
1. Ensure that air flow cards are installed in all full-size card slots and adapter card slots that are not
used.
2. Keep all cables away from sources of electrical interference, such as ac voltage lines, fluorescent
lights, arc welding equipment, and radio frequency (RF) induction heaters. These sources of electrical
noise can cause the system to become powered off.
3. If you have an expansion unit, ensure that the cables that attach the system unit to the expansion unit
are seated correctly.
Note: If the failures occur when people are close to the system or machines that are attached to the
system, the problem may be electrostatic discharge (ESD).
4. Have an installation planning representative use a radio frequency (RF) field intensity meter to
determine if there is an unusual amount of RF noise near the iSeries server. You can also use it to
help determine the source of the noise.
This ends the procedure.
INT-PIP8 Grounding: For use by authorized service providers.
Use this procedure to ensure that the system is electrically grounded correctly.
DANGER
An electrical outlet that is not correctly wired could place hazardous voltage on metal parts of the system or
the products that attach to the system. It is the customer's responsibility to ensure that the outlet is
correctly wired and grounded to prevent an electrical shock. (RSFTD201)
1. Have an installation planning representative or an electrician (when necessary), perform the
following steps.
2. Power off the iSeries server and the power network branch circuits before performing this procedure.
3. Read Electrical Safety for IBM Service Representatives, S229-8124.
4. To ensure the safety of personnel, all electrical wiring in the United States must meet National
Electrical Code requirements.
5. Check all system receptacles to ensure that each one is wired correctly. This includes receptacles for
the server and all equipment that attaches to the server, including workstations. Do this to determine
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iSeries: iSeries Server 270, 800, 810, 820, 825, 830, 840, 870, 890, SB2, and SB3 Hardware Problem Analysis and Isolation