User's Guide

Table Of Contents

Chapter 5 • Features

A c l a r a R F E l e c t r i c I - 2 1 0 + c U s e r G u i d e 59

Reading Notes

Present demand values and present energy values are retrieved from ST23,

whereas previous demand and energy values are obtained from ST25.

Maximum demand values ordinarily are accompanied by a timestamp that

indicates when the maximum occurred. However, there are situations in which a

present max demand timestamp will not be provided, or a zero value for time will

be provided. These include:

• The meter is a demand only meter.

• The demand interval has not closed out since the last demand reset has

occurred.

• The meter has not observed any usage for the specific unit of measure, e.g.,

kVAr, flow direction, e.g., reverse, and TOU tier (if any) combination since

the last demand reset.

Zeroes that show up in present max demand can be transferred to the previous max

demand with a demand reset.

If a zero value for time is sent from the meter, it will flow through the AMI system,

and at AclaraONE be converted from UTC time to local time. This will cause

occasional values for time to appear in the data representing sometime late in the

day on Dec 31, 1969. The MDM and/or billing system must recognize that this

timestamp is unreasonable and that with the zero value for the maximum, that no

demand of the specified kind was registered by the meter since the last demand

reset.

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