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63230-300-212 Chapter 4—Metering Capabilities
April 2001 Min/Max Values for Real-time Readings
53
© 2001 Schneider Electric All Rights Reserved
The circuit monitor also has the capability of 100 ms updates. The 100 ms
readings listed in Table 4–2 can be communicated over
MODBUS TCP and
are useful for rms event recording and high-speed alarms.
When any one-second real-time reading reaches its highest or lowest value,
the circuit monitor saves the value in its nonvolatile memory. These values
are called the minimum and maximum (min/max) values. Two logs are
associated with min/max values. The Min/Max Log stores the minimum and
maximum values since the last reset of the min/max values. The other log,
the Interval Min/Max/Average Log, determines min/max values over a
specified interval and records the minimum, maximum, and average values
for pre-defined quantities over that specified interval. For example, the circuit
monitor could record the min, max, and average every 1440 minutes (total
minutes in a day) to record the daily value of quantities such as kW demand.
See Chapter 7—Logging on page 99 for more about the Min/Max/Average
log.
From the circuit monitor display you can:
• View all min/max values since the last reset and view their associated
dates and times. See “Viewing Minimum and Maximum Values from the
Min/Max Menu” on page 39 for instructions.
• Resetmin/maxvalues.See“Resetting Min/Max, Demand, and Energy
Values” on page 37 for reset instructions.
Using
SMS you can also upload both onboard logs—and their associated
dates and times—from the circuit monitor and save them to disk. For
Table 4–2: 100 ms Real-Time Readings
Real-Time Readings Reportable Range
Current
Per-Phase 0 to 32,767 A
Neutral
0to32,767A
Ground
0to32,767A
3-Phase Average 0 to 32,767 A
Apparent rms 0 to 32,767 A
Voltage
Line-to-Line, Per-Phase 0 to 1,200 kV
Line-to-Line, 3-Phase Average 0 to 1,200 kV
Line-to-Neutral, Per-Phase
0to1,200kV
Neutral to Ground
0to1,200kV
Line-to-Neutral, 3-Phase Average
0to1,200kV
Real Power
Per-Phase
0 to ± 3,276.70 MW
3-Phase Total 0 to ± 3,276.70 MW
Reactive Power
Per-Phase
0 to ± 3,276.70 MVAR
3-Phase Total 0 to ± 3,276.70 MVAR
Apparent Power
Per-Phase
0 to ± 3,276.70 MVA
3-Phase Total 0 to ± 3,276.70 MVA
Power Factor
3-Phase Total –0.010 to 1.000 to +0.010
Wye systems only.
MIN/MAX VALUES FOR
REAL-TIME READINGS