User's Manual

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Operation: C1SD, C1ST, and C1SL Versions

5-18 CENTRON Meter Technical Reference Guide

If this meter is replaced by a Load Profile register of the same form number,

voltage and current ratings, and if the utility wants the register to operate the same

way, the pulse weight would be entered in the customer files as 1.8 watthours per

pulse.

Example 2: Calculation of Pulse Weight

A Load Profile register on a singlephase, 240V, CL200, meter is programmed so that

kWh is recorded into mass memory. The maximum 12-bit data resolution is desired

for 15 minute intervals.

First, calculate the maximum watthour accumulation during 15 minutes intervals:

The maximum number of pulses is 4095; therefore, the smallest pulse weight (PW)

that can be used is:

Data Storage

The Load Profile register stores data in mass memory at the end of each interval.

This data stored is the pulse data for that interval. This process continues for each

interval until sixty intervals have been recorded. The mass memory is grouped into

segments of sixty intervals defined as a record or block. In addition to the profile

data, each record contains the following information:

1.8 watt hours

pulse

----------------------------------

Wh Max, 240volts 200A 1phase 0.25×××=

Wh Max, 12 000 watt hours,=

PW Min,

12 000Wh,

4095P

---------------------------

2.94Wh

Pulse

-------------------

Time Tag

Specifies the month, day, and hour of the end of the data

record (or block).

Power Outage

Status bit is set for each interval during which a power

outage occurs (interval status).

Status Bits

There are four types of status bits written into each data

block:

Time Adjust

Status bit set along with power outage bit when time is

adjusted with Load Profile running.

Saturation

Status bit is set when the pulse count for any interval in

the block exceeds 4,095 pulses.

RAM Error

Status bit is set if any memory address within the record

fails the memory check (block status).

Field Test Status bit is set if Test mode is activated during an interval.

A register reading is maintained in the data record to be

used for data validation. This register reading is updated

at the end of each interval.