User's Manual

Operation: C1SD, C1ST, and C1SL Versions
CENTRON Meter Technical Reference Guide 5-17
Last Season Registers
Last Season Registers are selected when two or more seasons are used during the
year. For every Current Season Register there is a Last Season Register for the
same quantity. Last Season Registers are designated LS in the programming
software. Last Season Registers can also be selected for display in Normal and
Alternate display modes.
Operation
At the end of a specified season, all Last Season Registers are updated with
Current Season register data. The meter can be programmed to activate an
automatic demand reset at a season change. A season change can be programmed
to occur at midnight at the beginning of the programmed Season Change date or at
the first demand reset following the Season Change date.
Season Change
The following events take place when an automatic demand reset occurs at season
change:
• The Current Season energy registers are copied directly to the Last Season
energy registers.
• The Current Season maximum demand registers are copied directly to the Last
Season maximum demand registers and added to the cumulative demand
registers.
• After the demand reset, the maximum demand registers are reset to zero. Both
the cumulative and the continuous cumulative demand registers are copied to
the Last Season cumulative and continuous cumulative demand registers,
respectively.
If there is no demand reset at season change, all current season registers are
directly copied to Last Season registers at season change but no current season
registers are zeroed.
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
34 bytes of the 32k bytes is reserved for firmware and software parameters.