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64 Engineering and configuration guidelines
Configuration guidelines
Used with system option 71 (DC version).
Quautity as required by system power
consumptioti.
Switched Mode Rectifier
-
48VEOA (NT5CO3BJ)
This is a solid
state, switched-mode
rectifier. Converts 208/240 V ac
(nominal) to
48
V dc (nominal), with a 50A output. Used in the QCA13
power plant, with up to ten rectifiers in parallel.
Configuration guidelines
Used with system option 71 (DC version).
Quantity as required by system power consumption.
Commercial power and grounding requirements
Commercial power source
The commercial power source refers
to the
main
AC utility power feed, for either AC-powered or DC powered systems. For
AC systems, this power is wired directly to the system. For DC systems, this
power source would connect to the rectifiers, which would convert
to -48V dc for distribution to the system.
.
In
North
America, the power supplied can be either 208Y or 240 V ac
nominal. Three phase is not required but single power feeds from alternate
phases would be normal practice where three phase power is available. The
following Table shows the exact input voltage range:
Table
19
AC power ranges
Input
Voltage (V ac) at pedestal
Frequency (Hz)
Minimum Nominal
Maximum
180
208l240 250
47
50160 63
All power feeds used should contain a separate safety conductor (green wire).
Northern Telecom strongly recommends that the supply conductors be
dedicated and uninterrupted from a building primary source to a dedicated
equipment room sub-panel.
Power sub-panel
Power sub-panels must meet the following requirements
or be modified when used for the Meridian 1:
-
Panels should be located in the equipment room.
Power engineering 553-3001-l 52
.u