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Chapter 1 Basic Measurement Conditions
1.1 Configuring the Wiring System Settings
This section explains the following settings for wiring systems:
• Wiring system
• Wiring unit
• Wiring pattern
►
“Wiring System (Wiring)” in the features guide
Wiring Settings (Wiring Settings)
Press WIRING and then the Wiring soft key to display the following screen.
Set the wiring system (1P2W, 1P3W, 3P3W, 3P4W, 3P3W(3V3A)).
When you select an input element, the wiring systems that you can select are displayed. Select the wiring system from those displayed.
Wiring System Pattern
• If you select 1P3W, 3P3W, 3P4W, or 3P3W(3V3A) for the wiring system, the wiring unit is set with the two or three input elements adjacent to the selected element whose element numbers are larger than the selected element.
• On models that have six input elements installed, up to three wiring units (ΣA, ΣB, and ΣC) are automatically set. The wiring unit symbols ΣA, ΣB, and ΣC are attached to the element numbers in order, starting with the smallest number.
Note
• Because the wiring system with the largest element number is automatically determined according to the settings of the wiring systems with smaller element numbers, the element with the largest element number cannot be selected.
• You cannot set the wiring units for larger element numbers before the wiring units for smaller element numbers.
• To measure voltage, current, and active power Σ functions using high speed data capturing (/HS option), set the wiring system to 3P4W or 3P3W (3V3A). When the wiring system is set to 1P3W or 3P3W, voltage, current, and active power Σ functions are not measured.
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1.2 Setting the Voltage and Current Ranges
This section explains the following settings for the voltage and current ranges:
• Input element
• Auto range
• Fixed range
►
“Voltage Range (RANGE UP/DOWN (V))” and “Current Range (RANGE UP/DOWN (A))”
in the features guide
Voltage Range (VOLTAGE RANGE)
1.
Press the ELEMENT key for setting ranges to select the input element or wiring unit that you want to set the voltage range of.
• If you press ESC to clear the setup menu from the screen, soft keys corresponding to the input elements or wiring units will be displayed on the menu. You can use these soft keys to select the input element or wiring unit.
• Press for which the following conditions are met.
The input element type (for 5 A or for 50 A) is the same.
The valid measurement range setting (see section 1.7) is the same.
2.
Follow the instructions below to set the voltage range.
Auto Range Setting
Press the voltage range’s AUTO key.
Setting the Fixed Range
Press the voltage range’s fixed range keys (▲ and ▼) to set the voltage range.
Available Voltage Range Options
When the crest factor is set to 3
1.5 V, 3 V, 6 V, 10 V, 15 V, 30 V, 60 V, 100 V, 150 V,
300 V, 600 V, 1000 V
When the crest factor is set to 6
0.75 V, 1.5 V, 3 V, 5 V, 7.5 V, 15 V, 30 V, 50 V, 75 V,
150 V, 300 V, 500 V
Voltage range display
ELEMENT key for setting ranges
Note
When Element Independent (see section 1.9) is set to OFF, the voltage ranges of input elements that are assigned to the same wiring unit are set to the same range. When Element Independent is set to ON, you can set the voltage range of input elements that are assigned to the same wiring unit separately.
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1.2 Setting the Voltage and Current Ranges
Current Range (CURRENT RANGE)
1.
Press the
ELEMENT key for setting ranges to select the input element or wiring unit that you want to set the current range of.
• If you press ESC to clear the setup menu from the screen, soft keys corresponding to the input elements or wiring units will be displayed on the menu. You can use these soft keys to select the input element or wiring unit.
SHIFT+the ELEMENT (ALL) key for setting ranges to collectively configure all the input elements for which the following conditions are met.
The input element type (for 5 A or for 50 A) is the same.
The valid measurement range setting (see section 1.7) is the same.
2.
Follow the instructions below to set the current range.
Auto Range Setting
Press the current range’s AUTO key.
Setting the Fixed Range
Press the current range’s fixed range keys (▲ and ▼) to set the current range.
Available Current Range Options
• 5 A Input Element
When the crest factor is set to 3
10 mA, 20 mA, 50 mA, 100 mA, 200 mA, 500 mA,
1 A, 2 A, 5 A
• 50 A Input Element
When the crest factor is set to 3
1 A, 2 A, 5 A, 10 A, 20 A, 50 A
When the crest factor is set to 6
5 mA, 10 mA, 25 mA, 50 mA, 100 mA, 250 mA,
500 mA, 1 A, 2.5 A
When the crest factor is set to 6
500 mA, 1 A, 2.5 A, 5 A, 10 A, 25 A
Current range display
ELEMENT key for setting ranges
Note
When Element Independent (see section 1.9) is set to OFF, the current ranges of input elements that are assigned to the same wiring unit are set to the same range. When Element Independent is set to ON, you can set the current range of input elements that are assigned to the same wiring unit separately.
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1.3 Setting the External Current Sensor Range
(Option)
This section explains the following settings for external current sensor ranges (current ranges that are used when external current sensors are being used). This feature is available on models with the /EX1 to /EX6 option.
• Input element
• External current sensor
• Auto range
• Fixed range
►
“External Current Sensor Range (EXT SENSOR; option)” in the features guide
1.
Press the ELEMENT key for setting ranges to select the input element or wiring unit that you want to set the external current sensor range of.
• If you press ESC to clear the setup menu from the screen, soft keys corresponding to the input elements or wiring units will be displayed on the menu. You can use these soft keys to select the input element or wiring unit.
SHIFT+the ELEMENT (ALL) key for setting ranges to collectively configure all the input elements for which the following conditions are met.
The input element type (for 5 A or for 50 A) is the same.
The valid measurement range setting (see section 1.7) is the same.
2.
Press
Press EXT SENSOR again to turn the EXT SENSOR key off. In this state, you can set the current range that is used when current is applied directly to the WT1800 (see section 1.2).
3.
Follow the instructions below to set the external current sensor range.
Auto Range Setting
Press the current range’s AUTO key.
Setting the Fixed Range
Press the current range’s
fixed range keys (▲ and ▼) to set the external current sensor range.
Available External Current Sensor Range Options
When the display format of the external current sensor range is set to DIRECT, you can select the range from the available options shown in the following table (the unit is mV or V). When the display format is set to MEAS, the setup range is set to the value from the following table divided by the external current sensor conversion ratio (the unit is A). For instructions on how to set the display format of the external current sensor range, see section 1.5.
When the crest factor is set to 3 When the crest factor is set to 6
50 mV, 100 mV, 200 mV, 500 mV, 1 V, 2 V, 5 V, 10 V 25 mV, 50 mV, 100 mV, 250 mV, 500 mV, 1 V, 2.5 V,
5 V
External current sensor range display
ELEMENT key for setting ranges
Note
When Element Independent (see section 1.9) is set to OFF, the external current sensor ranges of input elements that are assigned to the same wiring unit are set to the same range. When Element Independent is set to ON, you can set the external current sensor range of input elements that are assigned to the same wiring unit separately.
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1.4 Setting the External Current Sensor
Conversion Ratio (Option)
This section explains the following settings for the external current sensor conversion ratio. This feature is available on models with the /EX1 to /EX6 option.
• Conversion ratio
• Copying the conversion ratio
►
“External Current Sensor Conversion Ratio (SENSOR RATIO; option)” in the features guide
Sensor Ratio Menu
Press SHIFT+EXT SENSOR (SENSOR RATIO) to display the following menu.
Cursor (use the ◄► cursor keys to move it)
Set the conversion ratio (0.0001 to 99999.9999).
Copies the conversion ratio
The conversion ratio of the input element that is indicated by the cursor is copied to all the input elements in that element’s wiring unit.
Note
External Current Sensor Range and Conversion Ratio Configuration Example
When measuring a current with a maximum value of 100 A using a current sensor that produces 10 mV when
1 A of current is flowing, the maximum voltage that the current sensor produces is 10 mV/A × 100 A = 1 V.
Therefore, configure the settings as indicated below.
• External current sensor range: 1 V
• External current sensor conversion ratio: 10 mV/A
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1.5 Setting the Display Format of the External
Current Sensor Range (Option)
This section explains the following setting for the external current sensor range. This feature is available on models with the /EX1 to /EX6 option.
• Display format
►
“External Current Sensor Range Display Format (DIRECT/MEASURE; option)”
in the features guide
1.
Press the
ELEMENT key for setting ranges to select the input element or wiring unit that you want to set the external current sensor range of.
• If you press ESC to clear the setup menu from the screen, soft keys corresponding to the input elements or wiring units will be displayed on the menu. You can use these soft keys to select the input element or wiring unit.
• Press for which the following conditions are met.
The input element type (for 5 A or for 50 A) is the same.
The valid measurement range setting (see section 1.7) is the same.
2.
Press
Press EXT SENSOR again to turn the EXT SENSOR key off.
3.
Press or MEAS indicator, which indicates the display format, illuminates. The external current sensor range is displayed in the indicated display format.
Press SHIFT+the current range’s CONFIG (DIRECT/MEASURE) key again to switch the display format.
The indicators illuminate and turn off appropriately.
External current sensor range display
(Display example of when the display format is set to MEASURE.)
ELEMENT key for setting ranges
Display format indicators
(DIRECT, MEASURE)
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1.6 Setting the Scaling Feature When Using a VT or CT
This section explains the following settings for measuring voltage through an external VT (voltage transformer) and current that through an external CT (current transformer):
• Turning the scaling feature on and off
• VT ratio
• CT ratio
• Power coefficient
►
“Scaling (SCALING)” in the features guide
Scaling Menu
Press SCALING to display the following menu.
Turns the scaling feature on and off
*
* When you want to multiply the external current sensor output by the
Set the VT ratio.
conversion ratio and read the current of the circuit under measurement directly, turn the VT/CT scaling feature off. If it is turned on, the value will be further multiplied by the CT ratio.
Set the CT ratio.
Set the power coefficient.
Setting the VT Ratio (VT Scaling)
Press the VT Scaling soft key to display the following menu.
Cursor (use the ◄► cursor keys to move it)
Set the VT ratio (0.0001 to 99999.9999).
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Copies the VT ratio
The VT ratio of the input element that is indicated by the cursor is copied to all the input elements in that element’s wiring unit.
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1.6 Setting the Scaling Feature When Using a VT or CT
Setting the CT Ratio (CT Scaling)
Press the CT Scaling soft key to display the following menu.
Cursor (use the ◄► cursor keys to move it)
Set the CT ratio.
Copies the CT ratio
The CT ratio of the input element that is indicated by the cursor is copied to all the input elements in that element’s wiring unit.
Setting the Power Coefficient (SF Scaling)
Press the SF Scaling soft key to display the following menu.
Cursor (use the ◄► cursor keys to move it)
Set the power coefficient.
Copies the power coefficient
The power coefficient of the input element that is indicated by the cursor is copied to all the input elements in that element’s wiring unit.
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1.7 Setting the Valid Measurement Range
This section explains the following settings for the valid measurement range:
• Valid measurement range
• Measurement ranges that the WT1800 can switch to when a peak over-range occurs
►
“Valid Measurement Range (CONFIG (V)/CONFIG (A))” in the features guide
Setting the Valid Voltage Measurement Range (Voltage Range
Configuration)
Press the voltage range’s CONFIG key to display the following screen.
Available voltage range options
For each range, you can set whether the range is a valid measurement range for all input elements (All
ON) or not (All OFF).
Valid measurement range
• The measurement range switches (in order) between the ranges whose check boxes are selected.
• Ranges whose check boxes are not selected are skipped.
• When Element Independent (see section 1.9) is set to OFF, the input elements that are assigned to the same wiring unit are set to the same status.
If the measurement range to switch to when a peak over-range occurs has been selected, the range background is displayed in yellow.
For each input element or wiring unit, you can set all ranges as valid measurement ranges (All ON).
Slot in which an input element is not installed
Available options for the measurement ranges that the WT1800 can switch to when a peak over-range occurs
Measurement range to switch to when a peak over-range occurs
• When Element Independent is set to OFF, the input elements that are assigned to the same wiring unit are set to the same range.
• If auto range is on (you can turn it on by pressing AUTO), the WT1800 operates as follows:
• When a peak over-range occurs, the measurement range increases to the range specified here, skipping the ranges in between.
• When the measurement range to switch to when a peak over-range occurs is set to OFF, the measurement range increases in the order specified by the measurement ranges whose check boxes have been selected.
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1.7 Setting the Valid Measurement Range
Setting the Valid Current Measurement Range (Current Range
Configuration)
Press the current range’s CONFIG key to display the following menu.
Set the valid measurement ranges of the 50 A input element.
Direct input range
Set the valid measurement ranges of the 5 A input element.
Set the valid measurement ranges of the external current sensor.
Setting the Valid Measurement Range of 50 A Input Elements (50A
Input Element)—Direct Input Range
Available current range options
For each range, you can set whether the range is a valid measurement range for all input elements (All
ON) or not (All OFF).
Valid measurement range
• The measurement range switches (in order) between the ranges whose check boxes are selected.
• Ranges whose check boxes are not selected are skipped.
• When Element Independent (see section 1.9) is set to OFF, the input elements that are assigned to the same wiring unit are set to the same status.
If the measurement range to switch to when a peak over-range occurs has been selected, the range background is displayed in yellow.
For each input element or wiring unit, you can set all ranges as valid measurement ranges (All ON).
Slot in which a 50 A input element is not installed
Available options for the measurement ranges that the WT1800 can switch to when a peak over-range occurs
Measurement range to switch to when a peak over-range occurs
• When Element Independent is set to OFF, the input elements that are assigned to the same wiring unit are set to the same range.
• If auto range is on (you can turn it on by pressing AUTO), the WT1800 operates as follows:
• When a peak over-range occurs, the measurement range increases to the range specified here, skipping the ranges in between.
• When the measurement range to switch to when a peak over-range occurs is set to OFF, the measurement range increases in the order specified by the measurement ranges whose check boxes have been selected.
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1.7 Setting the Valid Measurement Range
Setting the Valid Measurement Range of 5 A Input Elements (5A
Input Element)—Direct Input Range
Available current range options
Valid measurement range
• The measurement range switches (in order) between the ranges whose check boxes are selected.
• Ranges whose check boxes are not selected are skipped.
• When Element Independent (see section 1.9) is set to OFF, the input elements that are assigned to the same wiring unit are set to the same status.
If the measurement range to switch to when a peak over-range occurs has been selected, the range background is displayed in yellow.
For each range, you can set whether the range is a valid measurement range for all input elements (All
ON) or not (All OFF).
For each input element or wiring unit, you can set all ranges as valid measurement ranges (All ON).
Slot in which a 5 A input element is not installed
Available options for the measurement ranges that the WT1800 can switch to when a peak over-range occurs
Measurement range to switch to when a peak over-range occurs
• When Element Independent is set to OFF, the input elements that are assigned to the same wiring unit are set to the same range.
• If auto range is on (you can turn it on by pressing AUTO), the WT1800 operates as follows:
• When a peak over-range occurs, the measurement range increases to the range specified here, skipping the ranges in between.
• When the measurement range to switch to when a peak over-range occurs is set to OFF, the measurement range increases in the order specified by the measurement ranges whose check boxes have been selected.
Setting the Valid Measurement Range of External Current Sensors
(Ext Sensor Input Element)
Available external current sensor range options
For each range, you can set whether the range is a valid measurement range for all input elements (All
ON) or not (All OFF).
Valid measurement range
• The measurement range switches (in order) between the ranges whose check boxes are selected.
• Ranges whose check boxes are not selected are skipped.
• When Element Independent (see section 1.9) is set to OFF, the input elements that are assigned to the same wiring unit are set to the same status.
If the measurement range to switch to when a peak over-range occurs has been selected, the range background is displayed in yellow.
For each input element or wiring unit, you can set all ranges as valid measurement ranges (All ON).
Slot in which an input element is not installed
Available options for the measurement ranges that the WT1800 can switch to when a peak over-range occurs
Measurement range to switch to when a peak over-range occurs
• When Element Independent is set to OFF, the input elements that are assigned to the same wiring unit are set to the same range.
• If auto range is on (you can turn it on by pressing AUTO), the WT1800 operates as follows:
• When a peak over-range occurs, the measurement range increases to the range specified here, skipping the ranges in between.
• When the measurement range to switch to when a peak over-range occurs is set to OFF, the measurement range increases in the order specified by the measurement ranges whose check boxes have been selected.
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1.8 Setting the Efficiency Equation
This section explains the following settings for the efficiency equation:
• Efficiency equation
• Summation of the active power and motor output
3
►
“Efficiency Equation (η Formula)” in the features guide
Setting the Efficiency Equation (ηFormula)
Press WIRING and then the η Formula soft key to display the following screen.
Installed input elements
The set wiring systems
Set the denominator and numerator of the efficiency equation to the active power and motor power measurement functions.
(P1 to P6,
1
PΣA to PΣC,
2
Pm,
3
Udef1,
Udef2).
You can set up to four equations: η1 to η4.
Define Udef1 and Udef2
(P1 to P6, 1 PΣA to PΣC, 2 Pm 3 ).
To add active powers and motor output and use them in η1 to η4, use Udef1 and Udef2.
1 Can be set within the range of the installed input elements.
2 Can be set within the range of the wiring unit that is automatically determined by the installed input elements.
3 Can be set on models with the /MTR option.
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1.9 Turning the Independent Input Element
Configuration On and Off
This section explains how to turn the independent input element configuration on and off.
►
“Independent Input Element Configuration (Element Independent)” in the features guide
Wiring Menu
Press WIRING to display the following menu.
Turns independent input element configuration on and off
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1.10 Setting Delta Computation (Option)
This section explains the following settings for the delta computation. This feature is available on models with the /DT option.
• Delta computation type
• Delta computation mode
►
“Delta Computation (Δ Measure; option)” in the features guide
Delta Computation Settings (Δ Measure)
Press
WIRING and then the Δ Measure soft key to display the following screen.
Set the delta computation mode (rms, mean, dc, r-mean, ac).
Installed input elements
The set wiring systems
Set the delta computation type.
The available options vary depending on the set wiring systems.
Wiring System Delta Computation Type
1P3W
3P3W
3P4W
Difference, 3P3W > 3V3A
Difference, 3P3W > 3V3A
Star > Delta
3P3W(3V3A) Delta > Star
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1.11 Setting the Crest Factor
This section explains how to set the crest factor.
►
“Crest Factor (Crest Factor)” in the features guide
System Config Menu
Press UTILITY and then the System Config soft key to display the following menu.
Set the crest factor (CF3, CF6).
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1.12 Setting Measurement Periods
This section explains how to set the synchronization sources that determine the measurement period.
►
“Measurement Period (SYNC SOURCE)” in the features guide
Sync Src Menu
Press SYNC SOURCE to display the following menu.
Set the synchronization source
(U1, I1, U2, I2, U3, I3, U4, I4, U5, I5, U6, I6, Ext Clk, None).
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1.13 Setting Line Filters
This section explains the following settings for line filters:
• Turning line filters on and off
• Cutoff frequency
►
“Line Filter (LINE FILTER)” in the features guide
Line Filter Menu
Press LINE FILTER to display the following menu.
Cursor (use the ◄► cursor keys to move it)
Configure the line filter settings:
• Turn the line filter on or off.
• Set the cutoff frequency (0.1kHz to 100.0kHz in steps of 0.1 kHz, 300kHz, 1MHz).
Copies the line filter setting
The line filter setting of the input element that is indicated by the cursor is copied to all the input elements in that element’s wiring unit.
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1.14 Setting Frequency Filters
This section explains how to set the frequency filter.
►
“Frequency Filter (FREQ FILTER)” in the features guide
Freq Filter Menu
Press SHIFT+LINE FILTER (FREQ FILTER) to display the following menu.
Set the frequency filter (OFF, 100Hz, 1kHz).
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1.15 Setting the Data Update Interval
This section explains how to set the data update interval.
►
“Data Update Interval (UPDATE RATE)” in the features guide
Update Rate Menu
Press UPDATE RATE to display the following menu.
Increases the data update interval
Set the data update interval (50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, 20s).
Decreases the data update interval
The current data update interval
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1.16 Setting Averaging
This section explains the following settings for averaging:
• Turning averaging on and off
• Averaging type
• Attenuation constant
• Average count
►
“Averaging (AVG)” in the features guide
Averaging Menu
Press AVG to display the following menu.
Turns averaging on and off
Set the averaging type (Exp, Lin).
Set the attenuation constant or average count.
• When Type is set to Exp: Set the attenuation constant (2 to 64).
• When Type is set to Lin: Set the average count (8 to 64).
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1.17 Displaying the Setup Parameter List
This section explains how to display a list of setup parameters.
►
“Displaying the Setup Parameter List (INPUT INFO)” in the features guide
Info Form Menu
1. Press INPUT INFO. The INPUT INFO key illuminates and the split display appears.
The top half of the screen displays the setup parameter list. Press INPUT INFO again to clear the setup parameter list and display the previous screen.
2.
Hold down
FORM until the Info Form menu appears.
Input element or measurement range settings are displayed.
Input Element Settings List
Select Power Element
Settings.
Measurement Range Settings List
Select Range Settings.
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1.17 Displaying the Setup Parameter List
Info Items Menu
3.
Press
Turns the display frame on and off
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