APC Automatic Disconnect Switch Specifications Page 16

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6 Automatic Transfer Switch with Power Distribution
How the InfraStruXure Power Generation
System Operates
Operation of the ATS during a utility mains failure when automatic operation is
enabled
Typically, your data center
equipment is powered by
utility mains [Source 1] (
),
and the generator is off.
When the Source 1 line
quality is bad (
), the ATS
signals the generator to start
(
).When the generator
starts, the ATS will perform
an open transfer to generator
(
).
The generator will run and
support your data center
equipment (
) until utility
mains comes back on-line
(
). Once the utility mains
has been of good and stable
quality for the length of the
Line Stable setting and the
generator has run for the
Min Gen Runtime setting, your data center equipment is once again powered by utility mains (
).
The re-transfer to utility mains can be either an open or closed transfer. After the re-transfer, the
generator will cool down (
) and stop.
For more information.
See page page 33 for description of how the ATS determines that the line quality is bad.
See page 7 for a detailed description of the start sequence.
See page 8 for a detailed description of an open and closed transfer.
See page 7 for a detailed description of the generator cool-down.
See page page 35 for information about the Line Stable setting.
See page page 35 for information about the Min Gen Runtime setting.
Load
Powered by
Utility Mains
Generator
Off
Generator
Cool-Down
Generator
Start
Sequence
Load
Powered
by Generator
Utility Mains Failure
Generator Started
Open Transfer
to Generator
Utility Mains
Restored
Re-Transfer to
Utility Mains
(Open or Closed)
Generator Started
Generator Stopped
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