Identifying System Power Requirements Nur für den internen Gebrauch
A31003-H3590-S100-7-7620, 06/2012
D-14 HiPath 3000/5000 V9, Service documentation
power_calc.fm
Checking Whether the Output of a Power Supply Unit is Sufficient
D.7 Checking Whether the Output of a Power Supply Unit is
Sufficient
Apart from the secondary power requirements, the power output must also be checked to en-
sure that the maximum possible output of the system’s power supply unit is sufficient. For this,
the power requirement on the 5-V output format and on the -48-V output format must be exam-
ined separately.
Procedure
Proceed as follows to identify the secondary power requirement of a system:
1. Determine secondary power requirement at the 5-V output
2. Determine secondary power requirement at the -48-V output
Using the specified values, check whether the total power requirement exceeds the maximum
possible output of the power supply unit at the 5-V output or at the -48-V output. If this is the
case, you have the following options:
● HiPath 3800
The number of LUNA2 power supply units can be increased.
● HiPath 3550 with UPSC-D
The maximum nominal output of the –48-V output can be increased from 53 W to 110 W
by using the external power supply Powerbox PB3000 with LUNA2.
● HiPath 3350 with UPSC-D
The maximum nominal output of the –48-V output can be increased from 53 W to 110 W
by using the external power supply Powerbox PB3000 with LUNA2.
7
Caution
To guarantee smooth system operation, the nominal output of the power supply unit
at the 5-V output and at the -48-V output must be greater than the respective sec-
ondary power requirement.
5 V power requirement of the boards/components used
= secondary power requirement at the 5-V output
–48-V power requirement of the boards/components used
+ power requirement of connected workpoint clients (analog and digital telephones),
key modules and adapters
= secondary power requirement at the -48-V output
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