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Sensors
Overview
All internal sensors are measured every 15 seconds. External sensors are measured every 15
to 30 seconds, depending on the number of devices connected. Sensor data collected by the
7M, 7N, 7S or 7W unit gives useful trend analysis data. While all values are not absolute in
relation to a known unit, trend analysis of the data allows users to view changes and draw
useful conclusions about what is happening over time in the monitored environment.
Note:
DM series units are connected as sensors and collect a large amount of data. These will take longer
than the usual 15 to 30 second for the
7M, 7N, 7S or 7W
units to measure.
Internal Sensors
The 7M, 7N, 7S and 7W units contain internal sensors that are configured in two different ways:
Wye Configuration
Total Unit
o
Kilowatt-Hours: Cumulative sum of Real Power for all lines.
o
Real Power: Total average of instantaneous voltage and current on all lines over
last 1.5 seconds.
Line Level (A, B, C):
o
Kilowatt-Hours: Cumulative sum of Real Power.
o
Volts: Measures instantaneous RMS voltage.
o
Volts (Peak): Reports the highest reported voltage since the last time the data
was updated, typically every 15 seconds.
o
Real Power: Average of instantaneous voltage and current over last 1.5 seconds.
o
Apparent Power: The product of instantaneous RMS Voltage and RMS Current.
o
Power Factor: The ratio of Real Power to Apparent Power.
o
Amps: Measures instantaneous RMS current.
o
Amps (Peak): Reports the highest reported current since the last time the data
on the screen
Delta Configuration
Total Unit
o
Kilowatt-Hours: Cumulative sum of Real Power for all lines.
o
Real Power: Total average of instantaneous voltage and current on all lines over
last 1.5 seconds.
Phase Level (AB, BC, CA):
o
Kilowatt-Hours: Cumulative sum of Real Power.
o
Volts: Measures instantaneous RMS voltage.
o
Volts (Peak): Reports the highest reported voltage since the last time the data
was updated, typically every 15 seconds.
o
Real Power: Average of instantaneous voltage and current over last 1.5 seconds.
o
Apparent Power: The product of instantaneous RMS Voltage and RMS Current.
o
Power Factor: The ratio of Real Power to Apparent Power.
Line Level (A, B, C):
o
Amps: Measures instantaneous RMS current.
The 7W contains the following additional onboard sensors:
Summary of Contents for 7M Series
Page 14: ...14 Figure 8 Sensors Page Delta Configuration ...
Page 15: ...15 Figure 9 Sensors Page Group and Sensor Data ...
Page 17: ...17 Figure 10 Logging Page ...
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