NEC SV8500 Operation And Maintenance Manual - page 633
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CHAPTER 5
Operation Procedure for System with PIR
2.7
Replacement Procedure of 1U–C/DC Power Unit on 9U–IR (DC Power Input Version)
This section explains how to change the 1U–C/DC Power Unit from a Single Power Configuration to a
Dual Power Configuration as well as replacing the power units.
Note 1:
AC/DC power unit is in Single Power Configuration for shipping. Therefore, a blank unit is mounted
on the #1 side of the AC/DC power unit when shipped. There are two types of blank units: unit with two
LOCK keys and unit with one LOCK key.
Note 2:
Replacement should be processed one power unit at a time. Do not cut off power for both AC/DC power
units at the same time.
Note 3:
Replace the AC/DC power unit once every seven years.
Note 4:
When the AC/DC power unit is in Single Power Configuration, the cover provided must be secured to
the empty slot on the unit’s front side.
Single Power Configuration (For Shipping)
Blank Unit with Two LOCK Keys
Single Power Configuration (For Shipping)
Blank Unit with One LOCK Key
LOCK key
AC/DC power unit #0
Power Switch
Blank unit
Power Switch
AC/DC power unit #0
Blank unit
LOCK key