8-6
IB02601006E
www.eaton.com
Chapter 8:
Programming the IQ 250/260 IQ 250/260 Meter
Configuring Settings
The following sections contain detailed instructions for configuring the
Device Profile
settings. All of the settings are
reached from the
Tree Menu
of the
Device Profile
screen.
Configuring CT, PT Ratios and System Hookup
Use this setting to configure
Current Transformer
and
Potential Transformer
ratios and to select the
System
Hookup
.
Functional Overview of CT and PT Ratios
:
Current
and
Potential Transformers
are used mainly for the following reasons:
• To insulate, and as a result isolate, the meter from high-voltage circuits
• To change the primary voltage and current to standard values and sizes that the meter can measure.
The CT and PT transformers deliver fractions of the primary voltage and current to the meter. With properly set ratios
and multipliers, the readings of the meter can be used to determine the energy, voltage, current, or power of the
system.
From the
Tree Menu,
click
General Settings
>
CT, PT, Ratios and System Hookup
.
The screen
fields
and acceptable
entries
are as follows:
CT Ratios
CT Numerator (Primary):
1 - 9999
CT Denominator (Secondary):
5 or 1 Amp
NOTE
: This field is display only.
CT Multiplier (Scaling):
1, 10 or 100
Current Full Scale:
Display only
.
PT Ratios
PT Numerator (Primary):
1 - 9999
PT Denominator (Secondary):
40 - 600
PT Multiplier (Scaling):
1, 10, 100, or 1000
Voltage Full Scale:
Display only
.
System Wiring
3 Element Wye; 2.5 Element Wye; 2 CT Delta
Example Settings
:
For a
CT
of
2000/5A
, set the following
CT Ratios
in the entry fields:
CT Numerator (Primary)
2000
CT Denominator (Secondary)
5
CT Multiplier
1
The
Current Full Scale
field will read
2000
.
NOTE
: You can obtain the same
Current Full Scale
by entering a CT Numerator of 200 and a CT Multiplier of 10.
Содержание IQ 250
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Страница 100: ...A 2 IB02601006E www eaton com Appendix A IQ 250 260 Navigation Maps IQ 250 260 Meter Main Menu Screens Sheet 1...
Страница 101: ...Appendix A IQ 250 260 Meter IQ 250 260 Navigation Maps www eaton com IB02601006E A 3 Operating Mode Screens Sheet 2...
Страница 102: ...A 4 IB02601006E www eaton com Appendix A IQ 250 260 Navigation Maps IQ 250 260 Meter Reset Mode Screens Sheet 3...
Страница 103: ...Appendix A IQ 250 260 Meter IQ 250 260 Navigation Maps www eaton com IB02601006E A 5 Con guration Mode Screens Sheet 4...
Страница 104: ...A 6 IB02601006E www eaton com Appendix A IQ 250 260 Navigation Maps IQ 250 260 Meter...
Страница 134: ...A IQ 250 260 Meter Appendix B Modbus Mapping www eaton com IB02601006E MM 28...