IBM SAN512B-6, Installation, Service And User Manual

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The orange I symbol indicates an intake FRU. This unit pulls air in from the
nonport side of the device and exhausts it out the port side. This is called
back-to-front airflow or intake airflow. This symbol should appear on FRUs with
part numbers that contain an NPI.
The green E symbol indicates an exhaust FRU. This unit pulls air in from the port
side of the device and exhausts it out the nonport side. This is called front-to-back
airflow or exhaust airflow. This symbol should appear on FRUs with part numbers
that contain an NPE.
Ensure airflow direction of power supply and fan assemblies match airflow
direction of the chassis configured on installed WWN cards. If power supply or fan
air flow direction does not match, the FRU will fault. Faulty fans can cause
increase in temperature.
Airflow direction can be verified by entering the
chassisShow
command. Following
is an example from command output indicating mis-matching airflow. WWN units
should indicate "Non-portside Intake".
POWER SUPPLY Unit: 1
Power Source: AC
Fan Direction: Non-portside Intake
...
FAN
Unit: 2
Fan Direction: Non-portside Intake
...
WWN
Unit: 1
System AirFlow: Non-portside Exhaust
...
WWN
Unit: 2
System AirFlow: Non-portside Exhaust
Note: Ensure that captive screws securing the fan and power supply assemblies
are tightened. If they are not, air pressure inside chassis may unseat these FRUs
from chassis connectors.
Power supply assembly numbering
The following figure illustrates the location and number identification of power
supply assemblies in the chassis.
1 - Power supply 1
2 - Power supply 2
3 - Power supply 3
Figure 47. Power supply assembly numbering
Chapter 11. Power Supply Assemblies
163
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