IBM SAN512B-6, Installation, Service And User Manual

Page: 243 / 286

Note: All measurements are made with the receptacle face plate in the normal
installed position.
2.
Some receptacles are enclosed in metal housings. For this type of receptacle,
perform the following steps:
a. Check for less than 1 volt from the receptacle case to any grounded metal
structure, such as a raised-floor metal structure, water pipe, building steel,
or similar structure.
b. Check for less than 1 volt from the receptacle ground pin to a grounded
point in the building.
Note: If the receptacle case or face plate is painted, be sure that the probe
tip penetrates the paint and makes good electrical contact with the metal.
c. Check the resistance from the ground pin of the receptacle to the receptacle
case. Check the resistance from the ground pin to the building ground. The
readings should be less than 0.1 ohm, which indicates the presence of a
continuous grounding conductor.
3. If any of the three checks that you made in step ins008#mtlhsng are not correct,
ask the customer to:
v Remove the power from the branch circuit.
v Make the wiring corrections.
Recheck the receptacle.
Note: Do not use a digital multimeter to measure grounding resistance in the
following steps.
4.
Check for infinite resistance between the ground pin of the receptacle and each
of the phase pins. This check is for a wiring short to ground or a wiring
reversal.
5. Check for infinite resistance between the phase pins. This check is for a wiring
short.
CAUTION:
If the reading is other than infinity, do not proceed! Have the
customer make the necessary wiring corrections before you continue.
Do not turn on the branch circuit breaker until you satisfactorily
complete all the previous steps. (Refer to danger notices D004, D005 in
“Safety and environmental notices” on page xiii for more specific
information.)
6.
Have the customer turn on the branch circuit breaker. Measure for the
appropriate voltages between phases. If no voltage is present on the receptacle
case or the ground pin, the receptacle is safe to touch.
7. With an appropriate meter, verify that the voltage at the ac outlet is correct.
8. Verify that the grounding impedance is correct by using the ECOS 1020, 1023,
B7106, C7106, or an appropriately approved ground impedance tester.
Step 9. Check the intelligent power distribution units
The SAN rack can contain up to four intelligent power distribution units (iPDUs).
The iPDUs contains ac outlets to provide power to the directors. Two iPDUs (PN
00FW787) are factory-installed along the left and right sides of the rack in the
lower cutouts. These iPDUs provide power for the directors. You can install two
Appendix A. SAN rack
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