Operation: CP1SD/T/L Version
54
CENTRON® Polyphase Meter Technical Reference Guide
Interval Lengths
The load profile records data on a block interval basis. The interval length is programmable
for 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, or 60 minutes. The interval length is the same for all
channels and is independent of the interval length for demand quantities.
Power Outage
The D/T/L Register flags an interval when a power outage exceeds a specified number of
seconds. The range for power outage length is programmable from 0 to 255 seconds and
must not exceed the programmed interval length.
During power outages the CENTRON Polyphase meter maintains all meter data as well
as timekeeping functions.
During an outage, billing data is stored in non-volatile memory.
When power is restored, data is returned to active memory and normal metering
resumes.
The meter records the date and time of the power outage and the power restoration (for
meters with batteries).
Channel Configuration
The D/T/L Register can be programmed to have one to eight channels of interval load
profile data. Each channel corresponds to an energy register selected during the
programming process. In order to load profile an energy, the energy must first be selected
as a quantity to be measured.
Selection of channel configuration and pulse constants is accomplished through the
programming software. Each data channel is programmed to record load profile data from a
user-selected register. The energy registers allowed for load profile are listed in Energy
Data.
Pulse Constants
For each load profile channel, the pulse constant is programmable from 0.01 to 10 unit
hours per pulse in 0.01 increments. The load profile pulse constants apply to secondary
readings only.
Example: Calculation of pulse weight from kWh
A meter, 3-element, 120 Volts, CL20 is programmed to record kWh in load profile with 15
minute intervals.
First, calculate the maximum watthour accumulation during 15 minute intervals:
)
25
.
0
(
)
3
(
)
20
(
)
120
(
max
hours
X
phases
X
A
X
V
Wh
=
watthours
Wh
800
,
1
max
=
