3–6
EPM 4
5
00 SUB METER – INSTRUCTION MANUAL
VERIFYING METER FUNCTIONALITY
CHAPTER 3: USING THE METER
3.3.4
Verifying Current and Energy
Z
Press and hold the Display Scroll button until the following menu
heading is displayed:
Z
Release the Display Scroll button.
Scroll down by pressing and releasing the Display Scroll button
until the following submenu is displayed:
The A(mperage) reading in the display above will always be a positive number, even if the
CT was incorrectly installed. Check the reading to see if it indicates the approximate
expected current. Remember that this applies to Phase 1
only
. If all the numbers on the
multiplier screen were 1.00 and the current transformers are 100:0.1, your multiplier is 1
and the readings are the actual values. If the CTs are 200:0.1, multiply the current reading
by 2.
The W(att) reading will also count forward as your view the LCD. A negative power reading
is indicative of an incorrectly installed CT, or one that is cross-phased with the wrong
voltage (phase) leg. The R(eactive) reading can be negative, depending on the nature of the
load. Negative values indicate a capacitive load while positive values indicate an inductive
load.
Z
Scroll down by pressing and releasing the Display Scroll Button
until the following submenu is displayed:
Under normal conditions the phase angle (x.x°) should be close to 0° and the power factor
should be a number close to 1. Resistive loads will have a power factor close to 1, while
inductive loads will typically reflect a power factor between 0.80 to 0.95, or even lower.
If the phase angle on the lower left is a number close to 180°, it indicates the CT was
installed backwards, or 180° out-of-phase. If the number is close to 120°, at least two CTs
have been cross-phased, and a similar number will appear in the phase angle data in
Phase 2.
Note
To view screens for Phases 2 to 24, repeat above steps.
Phase Diagnostic
Registers
Phase 1
7.468 A
818.7 W
100.5 R
Ph 1
935.4 VA
6.8°
.875 PF
