User's Manual

Operation: C1SD, C1ST, and C1SL Versions
CENTRON Meter Technical Reference Guide 5-17
Load Profile Specifications
Capacity
The C1SL module provides 32k bytes of EEPROM for one channel of interval load
profile data. The amount of installed EEPROM actually used for load profile
recording is programmable from 1 to 32k bytes in one kbyte increments.
Bit Resolution
The mass memory is configured for 12 bit data resolution. Equivalent pulse count
resolution per interval is as follows:
Bits = 12
Pulse Counts = 4096
Interval Lengths
The load profile records data on a block interval basis. The interval length is
programmable: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, or 60 minutes. This interval length is
independent of the interval length chosen for displayed demand quantities.
Power Outage
The C1SL module can flag an interval when a power outage exceeds a specified
number of seconds. The power outage duration is programmable from 0 to 255
seconds.
Channel Configurations
The Load Profile register has one channel of interval load profile data. This
channel corresponds to kWh. The pulse constant is programmable from 0.02 to
99,999 watthours per pulse in 0.01 increments. This pulse constant applies to
secondary readings only. For example, a watthour pulse constant of 1.8
corresponds to 1.8 watthours per pulse.
Some example pulse weight calculations:
Example 1: Calculation of Pulse Weight
If the customer pulls a 240V, CL200, singlephase, Form 2S electromechanical meter
from service, with the following:
Meter Kh = 7.2 watthours/disk revolution
Pulse Initiator = 4 pulses/disk, revolution
then this electromechanical meter has the following pulse weight (PW):
34 bytes of the 32k bytes is reserved for firmware and software parameters.
PW
Kh
PDR
------------
7.2 watt hours
disk revolution
------------------------------------


4 pulses
disk revolution
------------------------------------


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