User's Manual

Operation: CVSO OpenWay Register
CENTRON® OpenWay™ Meter Technical Reference Guide 55
Energy Testing
The CENTRON OpenWay 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 12 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:
Keseconds
hour
NW secondper pulses
app
1
3600
1
# •••=
where N is the coil factor for single phase test method as shown in the table below.
If the meter is being tested using single phase test methods, a coil factor must be included in
the calculations. See the table below for the appropriate factor.
Meter Coil Factors
Form Series A Phase Only B Phase Only C Phase Only
9(8)
1
, 16(15,14) 3 1 1 1
1 When testing under true polyphase conditions, Forms 9 and 16 can only be tested as a 4-Wire
Wye. These forms cannot be tested as 4-wire deltas because of present limitation inherent in the
test equipment.
If accuracy or repeatability is poor, the Kh may be incorrect or the “settling time” in
the test bench must be adjusted. (Itron recommends a 4–5 second settling time.)
Testing Using the Load Indication Annunciator
The CENTRON OpenWay meter is capable of visually being tested by using the load
emulation annunciator shown in Load Indication/Direction Annunciator. As further
discussed in the load emulation annunciator section, the load emulation annunciator scrolls
at a rate proportional to the programmed energy constant.
Draft