Schneider Electric 4000 manual Using Incremental Energy, April Incremental Energy, 189

63230-300-212	Appendix B—Using the Command Interface
April 2001	Incremental Energy

INCREMENTAL ENERGY

Using Incremental Energy

End Time 12

11			rva					1
		te					l
		In
	t
	s
1
10						a		2
					v		l
				r
			e
			t
		In
		d
	3	r
9									3
Start Time 8								4
		2
		n
			d		I			l
7						nterva
								5
							6

1st Interval (7 hours) = 8:00 a.m. to 3:00 p.m 2nd Interval (7 hours) = 3:00 p.m. to 10:00 p.m 3rd Interval (2 hours) = 10:00 p.m. to 12:00 p.m

Figure B–3: Increment Energy Example

The circuit monitor’s incremental energy feature allows you to define a start time, end time, and time interval for incremental energy accumulation. At the end of each incremental energy period, the following information is available:

•Wh IN during the last completed interval (reg. 1748–1750)

•VARh IN during the last completed interval (reg. 1751–1753)

•Wh OUT during the last completed interval (reg. 1754–1756)

•VARh OUT during the last completed interval (reg. 1757–1759)

•VAh during the last completed interval (reg. 1760–1762)

•Date/time of the last completed interval (reg. 1763–1766)

•Peak kW demand during the last completed interval (reg. 1940)

•Date/Time of Peak kW during the last interval (reg. 1941–1944)

•Peak kVAR demand during the last completed interval (reg. 1945)

•Date/Time of Peak kVAR during the last interval (reg. 1946–1949)

•Peak kVA demand during the last completed interval (reg. 1950)

•Date/Time of Peak kVA during the last interval (reg. 1951–1954)

The circuit monitor can log the incremental energy data listed above. This logged data provides all the information needed to analyze energy and power usage against present or future utility rates. The information is especially useful for comparing different time-of-use rate structures.

When using the incremental energy feature, keep the following points in mind:

•Peak demands help minimize the size of the data log in cases of sliding or rolling demand. Shorter incremental energy periods make it easier to reconstruct a load profile analysis.

•Since the incremental energy registers are synchronized to the circuit monitor clock, it is possible to log this data from multiple circuits and perform accurate totalizing.

Incremental energy accumulation begins at the specified start time and ends at the specified end time. When the start time arrives, a new incremental energy period begins. The start and end time are specified in minutes from midnight. For example:

Interval: 420 minutes (7 hours)

Start time: 480 minutes (8:00 a.m.)

End time = 1440 minutes (12:00 p.m.)

The first incremental energy calculation will be from 8:00 a.m. to 3:00 p.m. (7 hours) as illustrated in Figure B–3.The next interval will be from 3:00 p.m. to 10:00 p.m., and the third interval will be from 10 p.m. to 12:00 p.m. because 12:00 p.m. is the specified end time. A new interval will begin on the next day at 8:00 a.m. Incremental energy accumulation will continue in this manner until the configuration is changed or a new interval is started by a remote master.

© 2001 Schneider Electric All Rights Reserved 189