Artesyn Centellis 2000 Shelf - DC Installation and Use (June 2014) - Manual (Page 122)

Power Subsystem
Centellis 2000 Shelf - DC Installation and Use (6806800G45F) 122
7.2.2.1 Management Power Distribution
The shelf's management power distribution system is used for powering the IPMCs engines of
shelf FRUs. This power source (3.4V DC) is distributed in the shelf via a redundant
interconnection. The first (V_A) is sourced from MF105-1, the second (V_B) from MF105-2.
The IPMCs are expected to OR the two sources to allow for redundancy. Current on each source
is limited to 1.0 A.
The Figure "Two-PEM Shelf Power Distribution" on page 123 illustrates the low power
distribution system in the shelf.
7.2.2.2 High Power Distribution
The shelf's high power distribution system is used for powering the blades, ShMCs, fan trays
and user cards. This high power source (-48V DC - nominal) manifests itself in a redundant
interconnect.
7.2.2.3 Power Interconnect
The redundant interconnect is made up of the PEM1 and PEM2 feeds. The first feed (-48V_A) is
sourced from the PEM1 on the left-hand side (as viewed from the front of the shelf). The
second feed (-48V_B) is sourced from the PEM2 on the right-hand side. Both feeds are
individually routed to each ShMC, fan tray, node and user card slot. In both interconnects, the
FRUs are expected to OR the two sources to allow for redundancy.
The PEMs are capable of supplying 25 A of current each. Their breakers allow for 30 A.