User's Manual

Operation: C1SD, C1ST, and C1SL Versions
5-18 CENTRON Meter Technical Reference Guide
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):
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:
PW
Kh
PDR
-------------
7.2 watt hours
disk revolution
--------------------------------------
⎝⎠
⎛⎞
4 pulses
disk revolution
--------------------------------------
⎝⎠
⎛⎞
⁄==
PW
1.8 watt hours
pulse
------------------------------------- -
=
Wh Max, 240volts 200A 1phase 0.25×××=
Wh Max, 12 000 watt hours,=