124
Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019
Chapter 5
Metering
Power
Real, Reactive, and Apparent power calculations (along with demand and
maximum demand) are made on each line power phase along with a total for all
three phases.
The Energy parameters can be cleared using the Meter Reset parameter. See
Resetting Metering Parameters on page 122
for further details.
The demand numbers are calculated as follows:
• Energy is calculated over a period of time defined by "Demand Period",
Parameter 290.
• The previous "n" period values are averaged and the result is written to the
Demand, Parameter 272, 281 and 288, which is used in calculating the
Max Demand values. This averaging uses a rolling window algorithm
where the previous "n" periods are averaged.
TIP
For Reactive Energy, Parameter 278 and 279, the system will keep a:
• positive energy, which only integrates power when it is positive,
• negative energy, which only integrates power when it is negative, and
• net energy, which always integrates.
Table 29 - Metering Parameters Associated with Power
Parameter Number
Name/Description
Min/Max Value Default Value
Access
Units
269
Real Power A
±1000.000
0.000
R
MW
270
Real Power B
271
Real Power C
10
Real Power
11
Real Energy
±1000.000
0.000
R
MWH
272
Real Demand
±1000.000
0.000
R
MW
273
Max Real Demand
274
Reactive Power A
±1000.000
0.000
R
MVAR
275
Reactive Power B
276
Reactive Power C
277
Reactive Power
278
Reactive Energy C
±1000.000
0.000
R
MVRH
279
Reactive Energy P
280
Reactive Energy
±1000.000
0.000
R
MVRH
281
Reactive Demand
±1000.000
0.000
R
MVAR
282
Max. Reactive Dmd
Summary of Contents for SMC-50
Page 10: ...10 Rockwell Automation Publication 1560F UM001A EN P June 2019 Table of Contents Notes ...
Page 12: ...12 Rockwell Automation Publication 1560F UM001A EN P June 2019 Preface Notes ...
Page 68: ...68 Rockwell Automation Publication 1560F UM001A EN P June 2019 Chapter 2 Installation Notes ...
Page 120: ...120 Rockwell Automation Publication 1560F UM001A EN P June 2019 Chapter 4 Programming Notes ...
Page 130: ...130 Rockwell Automation Publication 1560F UM001A EN P June 2019 Chapter 5 Metering Notes ...
Page 156: ...156 Rockwell Automation Publication 1560F UM001A EN P June 2019 Chapter 8 Diagnostics Notes ...
Page 198: ...198 Rockwell Automation Publication 1560F UM001A EN P June 2019 Chapter 10 Maintenance Notes ...
Page 284: ...284 Rockwell Automation Publication 1560F UM001A EN P June 2019 Appendix H Spare Parts Notes ...
Page 286: ...286 Rockwell Automation Publication 1560F UM001A EN P June 2019 Appendix I Accessories Notes ...
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