Operation: CP1SD/T/L Version
84
CENTRON® Polyphase Meter Technical Reference Guide
Nominal Voltage Indication Annunciator
The CENTRON Polyphase meter is equipped with a nominal voltage indication
annunciator. This annunciator indicates the voltage value to which the nominal voltage is
nearest. Nominal voltage indication values are 120, 240, 277, and 480.
Test Mode Annunciator
The CENTRON Polyphase meter is equipped with a Test Mode LCD annunciator. Located
in the lower left portion of the display, this annunciator is present when Test Mode or Test
Alternate Mode is activated. The word “TEST” appears on the display during Test Mode
activation. The words “ALT” and “TEST” appear on the display during Test Alternate
Mode activation. The “TEST” annunciator will also flash when the meter is in Toolbox
Mode.
Energy Testing
The CENTRON Polyphase meter is a CL 0.2 accurate meter and requires no calibration
adjustments. Verification of accuracy of energy and demand may be verified in many ways.
Testing With the Infrared Test LED
Verification of metered energy values by the meter can be accomplished by using the
pulsing infrared LED located in the 3 o’clock position of the faceplate.
With a constant load applied, the IR LED pulses are compared to the output of a
conventional high accuracy watthour standard. This is accomplished using an IR-compatible
optical pickup device and a pulse counter.
Follow these steps to test the Wh with the LED:
1
Program the meter with the desired pulse quantity(s) and pulse weight(s) Ke.
2
Apply a constant delivered watts load (Wapp) to the meter.
3
Verify that the LED pulses properly either by counting the pulses or using a pulse
counter to compare pulses from the meter under test to the standard. To determine the
number of pulses per second, use the following equation:
Ke
seconds
hour
N
W
second
per
pulses
app
1
3600
1
#
•
•
•
=
where
N
is the coil factor for single phase test method as shown in the table below.
