4–16
EPM 5100 ELECTRONIC POWER METER – USER GUIDE
CHAPTER 4: PROGRAMMING
4.7
Configuration
4.7.1
Options
The options available with the Configuration function are:
PT Ratio
CT Ratio
Demand Period Setup
Meter Type
Exit
Each of these options is described below.
4.7.2
PT Ratio
The potential transformer ratio is obtained by dividing the PT primary voltage by the EPM
5100 input voltage rating:
(EQ 4.3)
For instance, if 480 V AC PTs are installed in a 120 V meter, enter “4.0” in the display. If PTs
are not used, the proper ratio is 1.0 (the default setting).
Selecting this option produces the display:
Press
↵
to move to the right across the display, entering values in the appropriate positions
with the
V
and
U
keys. When the desired value is entered, continue pressing
↵
to return to
the Configuration menu.
4.7.3
CT Ratio
The current transformer ratio is obtained by dividing the CT current rating by 5 A:
(EQ 4.4)
For instance, if 1000 A CTs are installed, enter “200.0” in the display.
Selecting this option produces the display
Press
↵
to move to the right across the display, entering values in the appropriate positions
with the
V
and
U
keys. When the desired value is entered, continue pressing
↵
to return to
the Configuration menu.
P.T. Ratio:
0001.00000
PT Ratio
PT Primary Voltage
EPM Input Voltage Rating
---------------------------------------------------------------
=
C.T. Ratio:
00001.00000
CT Ratio
CT Primary Current Rating
5 A
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=