nvent SCHROFF 11990-19 Series, Руководство пользователя

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Power Entry Module (PEM) 36 R1.0, October 2018
8.4 Power Branches
The Backplane‘s power supply is divided into 6 power branches. Each of the
PEM’s 6 power branches supplies power to a group of slots and a Fan or Shelf
Manager. This topology is used to keep the max. current per branch less then
35 A.
Figure 29: Power distribution of the 6 Power Branches within the Shelf
8.5 Slot Power Calculation
Each branch supplies power to group of slots and/or a Fan Tray or a Shelf
Manager.
The Shelf Manager calculates the maximum branch power by the minimum
expected operating voltage (default 40 V) and the maximum branch current

(35 A) stored in the Shelf‘s FRU file.
With the default settings the available branch power is calculated with 1400 W.
With the power topology shown in Figure 18, the Shelf can supply a minimum
of 450 W per slot (40 V operating voltage, 540 W with 48 V operating voltage.)
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