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8 AC power system description
Pedestal Power Distribution Unit (PDU)
The Pedestal PDU provides the following:
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The Field Wiring Terminal Block provides a connection point for the
external wiring that is brought into the Pedestal.
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The EM1 Filter provides filtering of the wires connecting back to the
Utility in order to meet FCC and DOC requirements.
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The Main Circuit Breaker provides both a single protection device for
overload currents and a single trip device to shut down the column in the
event of a thermal overload.
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The Internal Terminal Block provides individual power hand-off points so
that each Module is independently powered from the Pedestal in order to
minimize wire size.
.
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The Power/Signal Harness provides the Power and Signal interconnections
in the Pedestal for the Blower Unit and System Monitor.
. .
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The System Monitor Power Supply (a small +5V power supply) provides
power to the System Monitor, even when the main circuit breaker has
tripped.
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The Output Power Harness provides the independent power connections
from the Pedestal to the Module above it.
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Module to Module Harness
The Module to Module Harness provides the following:
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The Module Feed provides the independent power feed(s) to the Module
above itself.
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The Module PDU Feed provides the power feed to the Module PDU.
Module Power Distribution Unit (MPDU)
The Module PDU provides the following functions:
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The Circuit Breaker provides a Module level of current protection so that a
fault on one Module will be disconnected while the other Modules remain
functional.
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The MPDU to Backplane Harness feed provides the power feed to the
backplane harness which in turn provides power to the AC Power
Supplies through the backplane power connector.
Power engineering
553-3001-152
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