Schneider Electric 4000 manual Peak Demand Generic Demand, April Demand Readings

63230-300-212	Chapter 4—Metering Capabilities
April 2001	Demand Readings

Peak Demand

Generic Demand

In nonvolatile memory, the circuit monitor maintains a running maximum for power demand values, called “peak demand.” The peak is the highest average for each of these readings: kWD, kVARD, and kVAD since the last reset. The circuit monitor also stores the date and time when the peak demand occurred. In addition to the peak demand, the circuit monitor also stores the coinciding average 3-phase power factor. The average 3-phase power factor is defined as “demand kW/demand kVA” for the peak demand interval. Table 4–3 on page 56 lists the available peak demand readings from the circuit monitor.

You can reset peak demand values from the circuit monitor display. From the Main Menu, select Resets > Demand. You can also reset the values over the communications link by using SMS. See the SMS online help for instructions.

NOTE: You should reset peak demand after changes to basic meter setup, such as CT ratio or system type.

The circuit monitor also stores the peak demand during the last incremental energy interval. See “Energy Readings” on page 64 for more about incremental energy readings.

The circuit monitor can perform any of the demand calculation methods, described earlier in this chapter, on up to 20 quantities that you choose. In SMS the quantities are divided into two groups of 10, so you can set up two different demand “profiles.” For each profile, you do the following in SMS:

•Select the demand calculation method (thermal, block interval, or synchronized).

•Select the demand interval (from 5–60 minutes in 1–minute increments) and select the demand subinterval (if applicable).

•Select the quantities on which to perform the demand calculation. You must also select the units and scale factor for each quantity.

Use the Device Setup > Basic Setup tab in SMS to create the generic demand profiles. For example, you might set up a profile to calculate the 15-minute average value of an analog input. To do this, select a fixed-block demand interval with a 15-minute interval for the analog input.

For each quantity in the demand profile, the circuit monitor stores four values:

•Partial interval demand value

•Last completed demand interval value

•Minimum values (date and time for each is also stored)

•Peak demand value (date and time for each is also stored)

You can reset the minimum and peak values of the quantities in a generic demand profile by using one of two methods:

•Use SMS (see the SMS online help file), or

•Use the command interface.

Command 5115 resets the generic demand profile 1. Command 5116 resets the generic demand profile 2.

See Appendix B—Using the Command Interface on page 181 for more about the command interface.

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