Schneider Electric K series Uživatelský manuál stáhnout pdf (Strana 25)

PLSED309039EN PM1000 Series Power Meters

08/2010 Chapter 2 – Quick Start Guide

Energy Integrator

The PM1000 series power meter is equipped with an energy integrator

function. It provides several parameters for Energy Management: VAh, Wh,

VARh (Ind), -VARh (Cap), run.h (run hours), on.h (on hours), INTR

(Interruptions / outages).

A few of these need explanation:

RUN.h: Indicates the period the load has been ON and has run. This

counter accumulates as long as the load is ON.

On.h: The period for which the power meter (supply) is ON.

INTR: Number of supply outages, means the number of auxiliary supply

interruptions. If the power meter auxiliary supply is from a UPS then the

INTR (number of interruptions) will be zero (as long as the UPS stays ON),

even if the voltage signals die out from time to time.

Integrator Overflow

The PM1000 series power meters contain a comprehensive Integrator to

support energy management. It accumulates several parameters over time,

as explained above. All values are direct readings and have a high

resolution. This is necessary for accurate energy analysis over short

intervals of time. It also means that the readings max out and reset sooner

or later, as given below. Since the Integrator contains counters for several

parameters (VAh, Wh, VARh, -VARh, Run Hours, On Hours, Interruptions),

they all reset together when any one of them overflows (usually Wh – but

can be changed to VAh via the OF Setup). This makes energy management

calculations such as Average PF very easy.

The maximum number that the power meter handles is 9,999 Giga for RMS

and energy values. The value at which the power meter overflows is given

below.

The overflow value depends on the product of the primary voltage and

current rating.

Table 2-1: Integrator overflow

OLD Data Register

The power meters have an OLD data register, where the cleared INTG

values will be stored.

The energy values in the integrator are transferred to the OLD register when

the INTG is cleared (manually/due to overflow). Thus the OLD energy

values are not lost even after the integrator is cleared and can be viewed

with the OLD parameter.

The values of parameters Wh, VAh, VARh, -VARh, and Run.h are stored in

the OLD register when the INTG is cleared.

V.PRI x A.PRI x

1.732

Max reading

(Wh/VAh)

Max time to

reset the

integrator in

Run Hours

Max time to

overflow in

months at full

scale

1 VA to 1000 VA

9999 k

9999

13.88

1 kVA to 1000 kVA

9999 M

9999

13.88

1 MVA to 1000

MVA

9999 G

9999

13.88

> 1000 MVA

<9999

<1 year

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 80 81

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