IBM EXP400 Type 1733, Руководство по техническому обслуживанию и ремонту

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CAUTION:
The power control button on the device and the power switch on the power
supply do not turn off the electrical current supplied to the device. The device
also might have more than one power cord. To remove all electrical current
from the device, ensure that all power cords are disconnected from the power
source.
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The expansion unit is designed to run continuously, 24 hours a day. Turn off the
power only when at least one of the following is true:
v
Instructions in a hardware or software procedure require you to turn off the
power.
v
A service technician tells you to turn off the power.
v A power outage or emergency situation occurs. See “Turning off the expansion
unit in an emergency.”
Complete the following steps to turn off the expansion unit:
1. Close all active operating system windows and programs.
2. Power down the server attached to the expansion unit.
3. Make sure that all amber status and fault LEDs are off. If any status or fault
LEDs are lit (on hard disk drives, power supplies, or ESMs), identify or correct
the problem before you turn off the power. For more information, see Chapter 5,
“Symptom-to-FRU index,” on page 31.
4. Turn off both power supplies.
Turning off the expansion unit in an emergency
Attention: Emergency situations might include fire, flood, extreme weather
conditions, or other hazardous circumstances. If a power outage or emergency
situation occurs, always turn off all power switches on all computing equipment.
This will help safeguard your equipment from potential damage due to electrical
surges when power is restored. If the expansion unit loses power unexpectedly, it
might be due to a hardware failure in the power system or midplane, see Chapter 5,
“Symptom-to-FRU index,” on page 31.
Complete the following steps to turn off the expansion unit during an emergency
situation:
1. Close all active operating system windows and programs.
2. Power down the server attached to the expansion unit.
3. If you have time, stop all activity and check the LEDs (front and back). Make
note of any status or fault LEDs that are lit so that you can correct the problem
when you turn on the power again.
4. Turn off all expansion unit power supplies; then, unplug the power cables from
the expansion unit.
Turning on the expansion unit after an emergency
Complete the following steps to restart the expansion unit if you turned off the
power supplies during an emergency shutdown, or if a power failure or a power
outage occurred:
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IBM EXP400 Storage Expansion Unit Type 1733: Hardware Maintenance Manual and Troubleshooting Guide