Operation: CP1SR Version
26
CENTRON® Polyphase Meter Technical Reference Guide
The transformer rated meters can be programmed to display either a 5xTR or 4xTR. In order
to determine the actual energy consumption, the display reading needs to be multiplied by
the transformer ratio (TR). If the transformer ratio is 1, then the reading on the display is the
actual energy consumption.
The LCD display contains an electronic load indicator (or watt disk emulator). The disk
emulator is three square segments in the lower right-hand corner of the display, which scroll
in the direction of energy flow. The LCD contains voltage indicators for A, B, and C phase.
These indicators will blink if nominal voltage falls below 20% of reference (A phase at
power up). These indicators will turn off if the voltage is below 96 volts.
Icons are illuminated on the display when the meter is programmed with a non-standard
algorithm. The LCD will display DET for detented energy and NET for net energy. There is
no additional indicator for the standard undetented configuration (i.e., where reverse energy
is accumulated in the forward register).
Factory programmable multipliers are available for CL20 (x20, x40 and x80) applications.
This allows the meter to display and transmit via RF primary readings. Meters are labeled
accordingly when factory programmed.
The display will scroll between the billing register and the segment check mode based on
the factory programming option.
Option
Description
1
7 second billing register display, 1 second blank, 7 second segment
check display (7/7)
2
7 second billing register display, 1 second blank, 1 second segment
check display (7/1)
3
Only the billing register is displayed (7/0)
Electronic Detent
The CP1SR module displays energy in increments of whole values of kWh. Standard
operation for this module is to accumulate both forward and reverse energy flow in the
positive direction. However, the CP1SR personality module is available with an electronic
detent that will cause the meter to ignore reverse energy flow. Therefore, if the meter is
inverted, the registers will accumulate in the forward direction only, thus providing
uni-directional operation. At the time of order, the CP1SR module can be selected to have a
detent register.
When the meter is undetented, both forward and reverse energy will be accumulated.
Therefore, the electronic load indicator will flash at a rate equal to the energy consumption,
regardless of the direction of the energy flow.
When the electronic detent is enabled, only forward energy flow will be accumulated.
