APC 15000 RAID User Manual

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8.7 Continuous Operation During Replacement 
Depending on how the subsystem is set up, if a disk unit fails, it can normally be replaced without 
interrupting the use of the system. 
8.8 Replacing a Module
Warning
Whenever replacing a module NEVER leave an EMPTY bay in the rear of the enclosure, obtain a 
replacement before removing the problem part.
Please refer to 
  for information on the initial installation of the 
plug-in modules in the drive enclosure.
Warning
Observe all conventional ESD precautions when handling drive enclosure modules and 
components. Avoid contact with Backplane components and module connectors, etc.
8.8.1
Power Cooling Modules
Warning
Do not remove covers from the Power Cooling module (PCM). There is a danger of electric shock. 
Return the PCM to your supplier for repair.
Warning
To ensure your system has warning of a power failure please disconnect the power from the 
power supply, by either the switch (where present) or by physically removing the power source, 
prior to removing the PCM from the enclosure/shelf. Do not remove the faulty PCM unless you 
have a replacement unit of the correct type ready for insertion. The system must not be run 
without all units in place.
If a power supply unit or its fan is faulty, you must replace the whole PCM. You must not take any longer 
than 5 minutes to replace this unit to prevent the enclosure from over-heating.
As there should always be two (2) PCMs installed, you can continue working while replacing the faulty 
module. 
To remove an AC PCM/Cooling Module- Handle Model:
Warning
Do not remove the faulty PCM/Cooling module unless you have a replacement unit of the correct 
type ready for insertion. 
If a power supply unit or its fan is faulty, you must replace the whole PCM/Cooling module. 
As there should always be two PCMs installed, you can continue working while replacing the faulty 
module. 
1
Make sure you identify the faulty PCM correctly from the two modules installed.
2
Lift latch which secures the power supply cord.
3
Switch off and disconnect the power supply cord.
4
Lift the PCM handle to the open position to cam the PCM out of the enclosure.
5
 Grip the handle and withdraw the PCM.