What is the Alternate source sense feature in PM1130H meter ?

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Alternate source sense terminals detect the status of alternate power sources.
Source 1 in the meter connects to utility and Source 2 connects to alternate
source. The two terminals are connected with a 1Ph LN alternate power source.
When Source 2 is turned on, voltage flows through the meter and the system is
powered with alternate source.
The meter measures energy accumulation and run hours on the alternate source.
The total energy used by the meter is the sum of accumulated energy for Source 1
and Source 2. Total run hours of the meter is the sum of run hours of Source 1 and
Source 2. Total accumulated energy, and run hours can be viewed through meter
display, and through communication.

NOTE: Old accumulated energy and run hours can be viewed through display and
communication for Source 1 and Source 2.