3-2
IM WT5000-01EN
Wiring System Combinations
You can configure any pattern that meets the conditions for wiring units described above.
For details about the relationship between wiring systems and how the values of the measurement functions are
determined, see appendix 1 in the Getting Started Guide, IM WT5000-03EN.
Select the wiring system to match the actual wiring of the circuit under measurement. he method in which the
Σ functions (wiring unit measurement functions) are determined varies depending on the wiring system. If the
selected wiring system does not match the wiring of the actual circuit, measurements and computation will not
be correct.
Wiring System Display
The wiring system settings are displayed on the Elements tab in the input information area on the right side
of the screen. The figure below shows wiring system display examples for a model with seven input elements
installed.
When the wiring systems
of elements 1 to 7 are set
to single-phase two-wire
When the wiring system of elements 1, 2, and 3 is
set to three-phase four-wire and the wiring system
of elements 5 and 6 is set to three-phase three-wire
Wiring unit and system
The elements that compose
the wiring unit are shown
in the frame.
Wiring unit and system
The elements that compose
the wiring unit are shown
in the frame.
Settings of Elements Grouped in a Wiring Unit
If a wiring system other than 1P2W is selected when the measurement range, valid measurement range, or sync
source settings of each input element are different, these settings are changed in the manner described below:
• When
is set to on, the measurement range is set to the greatest of the measurement ranges of
the input elements assigned to the same wiring unit. The external current sensor input range has precedence
over the direct input current range.
• When range Σ link is set to on, The auto range on/off settings are changed to match the setting of the
input element whose measurement range is highest. If multiple input elements are set to a common
highest measurement range, the setting of the input element with the smallest input element number takes
precedence.
• When range Σ link is set to on, in the valid measurement range settings, all measurement ranges are enabled
(selected).
• The sync source, line filter, frequency filter, and the group of the harmonic measurement input element are
set to the settings of the input element with the smallest input element number among the input elements
assigned to the same wiring unit.
At the same time that you press 1 to 7 (ELEMENTS) to select the element that you want to set the voltage or
current range of, the keys of the input elements that have been assigned to the same wiring unit illuminate.
3 Input Settings (Basic Measurement Conditions)
