Each chassis
supports up to eight -48 VDC, 80-amp power feeds, four per PFU. Each feed
consists of a supply and return cable.
Important:
The power source
must be a UL/CSA listed device with a regulated output no greater than -60VDC.
Typically, the DC
power feeds are fed from a power distribution frame (PDF) to a power
distribution panel (PDP) at the rack.
Important:
The DC power
Battery Return (BR) or positive terminal, must be grounded at the source end
(power feed or mains power end).
Important:
Minimum 4 AWG
multiple strand, high-flex cable is recommended for final connections from the
PDP to the PFUs. Although the chassis configuration may not draw maximum power,
it should be sized and wired to handle 12.8 kW of power to accommodate future
expansion. See
Power Cable Requirements.
Each feed connects
to supply and return terminals on the rear of the PFUs using two-hole lugs
crimped to the end of each cable. The feed cables are routed through openings
in each side of the chassis. The input terminals are wired through EMI filters
to the ASR 5500 backplane.
For a non-redundant
chassis power configuration, live power feeds must be connected to all four
power inputs on PFU-A. For a redundant power configuration, live power feeds
must be connected to all four power inputs on PFU-B. The four power feeds per
PFU assure that all power planes in the backplane are energized; power is
available to all card slots in the chassis. For additional information, see
Internal Power Planes.
The circuit breakers
at the power distribution panel must disconnect the
supply line of
each -48VDC feed. However, it is recommended that the circuit breakers at the
power distribution panel simultaneously disconnect both poles (supply and
return) for each -48 VDC feed to completely isolate the ASR 5500 from the power
source.
To maintain power
redundancy, separate –48 VDC supply circuits should be used to feed each DC
power input on both PFUs.
Caution |
Set the circuit
breakers on the distribution panel to the OFF position before making the power
connections at the PFUs.
|
Each power input
cable must be terminated with a supplied Panduit LCD4-14AF-L 2-hole, 90-degree
lug using the appropriate crimping tool and die.
The following
alternate lug types (not supplied with the chassis) are also approved for use
on the power feeds:
- Panduit LCC4-14AF-L, 4 AWG, 2-hole,
90-degree long barrel lug
- Burndy YAZ2C2TC1490, 2 AWG, 2-hole,
90-degree long barrel lug
If a DC power input
should fail, the operating supply circuits continue to power the ASR 5500.