IBM EXP400 Type 1733, Руководство по техническому обслуживанию и ремонту

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Rear view: ac power supply with fan units
Two hot-swap power supply with fan units are accessible from the back of the
expansion unit. These components at the back of the expansion unit contain
several user controls, LEDs, and connectors as shown in the following illustration.
Thumbscrews
Loosen the thumbscrews to remove or install a power supply with fan unit.
AC power connector
The power cord for the power supply with fan unit connects here.
Power supply with fan unit
The two hot-swap power supply with fan units are located on the back of
the expansion unit.
Attention: The expansion unit comes with two power supply with fan
units installed. When one power supply fails, the power-supply unit must be
replaced to reestablish redundancy. When replacing the failed unit with the
new power supply unit, ensure that this operation is performed in less than
10 minutes to prevent overheating.
The fan that is visible from the rear of the power supply is an auxiliary fan
that is normally off. This fan turns on only when the main fan within the
power supply fails.
Power on/off switch
Use this switch to turn the power supply on and off.
Fault LED (amber)
When lit continuously, this amber fault LED indicates a power supply failure
or that a redundant power supply is not turned on. This LED also flashes
when the built-in fan fails.
DC power LED (green)
This green LED is lit when the expansion unit is turned on and is supplying
both 5 volt and 12 volt dc power to the expansion unit.
AC power LED (green)
This green LED is lit when the power supply is receiving ac power.
Handles
The two handles are used for installing and removing the power supply with
fan unit.
Thumbscrews Thumbscrews
AC power connector AC power connector
Power
supply/Fan CRU
Power
supply/Fan CRU
AC power LED (green)
DC power LED (green)
Fault LED (amber)
Power
on/off
switch
Power
on/off
switch
Handle Handle
Chapter 1. General information
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