User's Manual

3UHOLPLQDU\
Contact Elster Electricity for information
30 November 2006 2-5
REX Meter
Technical Manual 2 Product Description
TOU Data. The REX meter stores the energy data for up to 4 rates. The meter
stores demand data for 2 quantities where each quantity is configured to be one
of the following:
■ total demand
■ demand for a specific rate
The REX meter receives the TOU switch point information from the collector, and
stores this information for each of the following day types:
■ weekday
■ weekend
■ special day type #1 (that is, holiday #1)
■ special day type #2 (that is, holiday #2)
The switch point information received from the collector is associated with a
specific season, and once received, the information is stored in nonvolatile
memory in the REX meter and is valid until a season change occurs. When a
season change occurs, the REX meter invalidates the switch point information
until new switch points are downloaded from the collector. The REX meter
stores energy in the default tier (rate C) if the switch points are invalid or if the
REX meter does not know the real time.
Without the collector, the REX meter does not know day type information. The
collector downloads calendar information to the REX meter to specify the day
type for the next 32 days. This 32-day calendar is stored in the REX meter and
allows the REX meter to set the day type correctly at each midnight crossing.
In addition to the switch points for the 4 day types, the REX meter has a
separate table that allows for tier overrides or critical tier pricing. In conjunction
with the MAS, the collector may be told a start time and a stop time for a tier
override. When in a tier override condition, the collector writes the tier override
table in the REX meter forcing the REX meter to use the override switch points
for a specific period of time. At the end of the override period, the REX meter will
revert to the standard switch points that are stored in the REX meter’s
nonvolatile memory.
Load Profiling
The REX meter supports load profiling.
■ REX meter firmware releases 1.0 and 2.0 support 104 load profiling
records.
■ REX meter firmware releases 3.0 and higher support 480 load profiling
records.
Each load profiling record stores one of the following:
■ K
h
pulses of the metered quantity (scaled by a K
h
pulse divisor) with
status flags to indicate if a power failure or time change has occurred
during the interval
■ date and time