Atec Yokogawa-WT1800 - Manual (Page 6)

Overview
To perform high precision power evaluation on the production line, a single WT1800 unit does the work for up to six single-phase power analyzers to
measure voltage, current, power, frequency, power factor, and harmonic distortion factor*. Also an independent integration function is available for each input
element to start and stop integration. Since data can be collected remotely by communicating with just a single WT1800 unit, it is easy to create programs.
Applications Applications Applications
Product Featur
es
Functions/Displays
Applications
Softw
ar
e
Comparisons
Explanations
Specifications
n Delta computation function
(/DT option)
n Electrical angle/rotation direction measurements
of motors
(/G5 and /G6 options) (/MTR option)
It is possible to obtain the differential voltage, line voltage, phase
voltage, etc. by obtaining the sums and differences of
instantaneous measurement values of voltage and current in each
element.
Differential voltage/current: Differential voltage and current
between two elements are computed in the three-phase
three-wire system.
l Line voltage/phase current: Line voltage and phase current that
are not measured are computed in the three-phase three-wire
system (Figure 1).
l Star-delta conversion: Line voltage is computed from the phase
voltage using the three-phase four-wire system data.
lDelta-star conversion: Phase voltage is computed from the line
voltage in the three-phase three-wire system (3V3A system)
(Figure 2).
A motor evaluation function makes it possible to measure the
rotation speed, torque, and output (mechanical power) of motors
from rotation sensor and torque meter signals. The input signal
from the rotation sensor and torque meter can be selected from
analog signal or pulse signal.
Furthermore, A-phase, B-phase, and Z-phase input terminals
have been newly added. The A-phase and B-phase make it
possible to detect the rotation direction of motors. In addition,
electrical angle* can be measured using Z-phase signals.
* Electrical angle measurements require the /G5 or /G6 option.
* Please purchase a torque sensor and rotation sensor separately.
Pulse/analog inputs are available for the motor evaluation function of the WT1800.
DL850 ScopeCorder
*1: Detailed switching waveforms of inverters cannot
be viewed with the WT1800. If you need to verify
the waveforms, you can use the DL850
ScopeCorder, which is capable of 100 MS/s, 12-bit
isolated input. For details, please see Yokogawa’s
website or catalog (Bulletin DL850-00EN).
Support for Performance Testing of
Multiple Home Appliances Support for Performance Testing of
Multiple Home Appliances
Also refer to the features of other applications. *Also refer to the features of other applications
1 to 6 home appliances
*The /G5 or /G6 option is required for the harmonic distortion factor measurement. Also, the /FQ option is required to measure four or more frequencies.
n Standby and operation power measurements of
up to six devices with a single unit
n Combined use with ScopeCorder for analog output
(/DA option)
Power measurements of up to six devices can be performed with a single unit. In standby
power measurement, 1 mA or less measurement is supported since measurements can be
performed from an effective input of 1% of the small current range in the rated 10 mA range.
Also, an average active power function allows you to calculate the mean power* by
intermittent oscillation control signals. A D/A output connector on the rear panel allows you to convert a
measurement value to ±5 V (rated value), 16-bit high resolution
DC voltage value and output it. Up to 20 items can be output
simultaneously.
Also, the ability to set the upper and lower limits for an arbitrary
range of input signals and scale up and down the D/A output in
the range from -5 V to +5 V allows you to enlarge a changing
part of the input signals to monitor it with a ScopeCorder, etc.
Figure 1 Line voltage/phase current
R-phase
T-phase S-phase
U2
Figure 2 Delta-star conversion
1 2 3 4 5 6
Computed
value Computed
value
R-phase
T-phase S-phase
U2
I1
Phase
voltage
Phase
voltage
Phase
voltage
I2
Phase
current
Line
voltage
U1 U3 U1
Standby power Standby power
DA zoom DA zoom
Advantages of WT1800
*For detailed specifications, see the page on the specifications. You need to provide a cable for voltage measurements when wiring.
WT1806-06-M-HE/EX6/B5/G6/FQ/V1/DA: 6 power inputs, current measurement range 10 mA to 55 A, or clamp measurement (with a clamp input terminal), built-in printer, all-channel frequency
measurement (×12), RGB output, dual harmonic, DA output
*An external input terminal (EX) allows you to perform both direct input measurement and clamp measurement. *Direct input and current sensor input cannot be connected Simultaneously.
Typical Product Configuration
*For detailed specifications, see the page on the specifications. You need to provide a cable for voltage measurements when wiring.
Direct input measurements at less than 50 A: WT1806-06-D-HE/B5/G6/DT/V1/MTR
6 power inputs, current measurement range 10 mA to 55 A, built-in printer, dual harmonic, delta computation, RGB output, motor evaluation function
Measurements at more than 50 A using a current sensor: WT1806-60-D-HE/B5/G6/DT/V1/MTR
6 power inputs, current measurement range 100 μA to 5.5 A (measure AC/DC current sensor output), built-in printer, dual harmonic, delta computation, RGB output, motor evaluation function
Typical Product Configuration
Analog/pulse
inputs
Analog/pulse
inputs
Electrical angle* Electrical angle*
All-channel
frequency
measurement*
All-channel
frequency
measurement*
Differential
voltage/current
Differential
voltage/current
Star-delta
conversion
Star-delta
conversion
*User-defined computation is used.
* 0 to 5 V is fixed for some items, such as frequency measurement.
Delta-star
conversion
Delta-star
conversion
A-, B-, and
Z-phases
A-, B-, and
Z-phases
Average
active power
Average
active power
20-channel
output
16-bit resolution
20-channel
output
16-bit resolution
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