Atec Yokogawa-WT1800 - Manual (Page 5)

Applications Applications Applications
*Als o refer to t he featu res of other app lication s.
I I I In I I In In In ve ve ve ve ve ve ve e ve ve e ve e t rt rt rt rt rt rt r r rt er er er e er e
* With three-phase input , power is
measur ed with the three-phase three-wire system.
In In In In In n n In In p p pu pu p p p t t
Convert AC to DC signals
Inverter section
Modulate DC signal and convert to any AC signals
* In this example, measurement is performed with
the three-phase three-wire system (at 3V3A) to verify the (inter-phase)
voltage and current of each phase.
indicates measurement points and input to the
power analyzer.
M indicates connecting the motor output to the
motor signal input (/MTR) of the power analyzer
Advantages of WT1800
n 5 MHz range and 2 MS/s high-speed sampling n Up to the 500th order harmonic measurement
(/G5 and /G6 options)
The vertical resolution in power measurements is one of the important elements for
high-precision measurements.
The WT1800 is capable of 16-bit high resolution and approximately 2 MHz sampling to make
it possible to measure faster signals with higher precision.
Yokogawa’s previous model* provides two different measurement modes, called Normal and
Harmonic, and each of the measurements is performed separately. The WT1800 makes it
possible to simultaneously measure voltage, current fundamental wave, harmonic
components, and harmonic distortion factor (THD) in the Harmonic measurement mode,
along with the conventional voltage and current RMS values in the Normal measurement
mode. You do not need to switch modes and can measure all data at high speed. In addition,
up to the 500th order harmonic can be measured for fundamental frequencies.
To evaluate the inputs and outputs of inverters including boost converters, at least 5 power
measurement inputs are required. The WT1800 provides 6 inputs to make it possible to
evaluate all aspects of inverters. In addition, a new individual null function makes it possible
to set the DC offset only on a particular input channel as the null value. This makes it
possible to perform more accurate measurements.
In previous models, harmonic measurement has been limited to a single line. The WT1800 is
capable of performing two-line simultaneous harmonic measurements with one unit for the
first time in the industry.
The ability to simultaneously measure harmonics for the input and output signals not only
reduces the switching time but also makes it possible to perform simultaneous data analysis
for the input and output, which has not been possible with the previous models.
*Comparison with Yokogawa’s previous model WT1600
n Boost converter efficiency and inverter efficiency
evaluation
n Dual harmonic measurement
(/G6 option)
The following measurements can be performed for up to the
500th order
Single harmonic measurement (/G5 option)
Dual harmonic measurement (/G6 option)
Drive circuit Converter section
M Mo to r To rq ue /
rotation
sensor
Load
1 2
3 4 5 6
M
( p )
Keyword Keyword Keyword
Approx.
2 MS/s 16-bit
Approx.
2 MS/s 16-bit
Individual
null function
Individual
null function
Simultaneous
harmonic
Simultaneous
harmonic
Up to the
500th order
Up to the
500th order
Dual harmonic
measurement
Dual harmonic
measurement
Up to the
500th order
Up to the
500th order
Simultaneous
input/output
measurement
Simultaneous
input/output
measurement
6-input 6-input
Overview
The WT1800 is capable of performing up to 6 power input measurements to make it possible to perform an inverter efficiency test between the input and output in inverter evaluation.
In addition, a motor evaluation function (option) makes it possible to simultaneously monitor voltage, current, and power changes, as well as rotation speed and torque changes.
*Als o refer to t he f eatures of o ther app lications
Input/Output Efficiency Measurements of Inverters,
Matrix Converters, Motors, Fans, and Pumps Input/Output Efficiency Measurements of Inverters,
Matrix Converters, Motors, Fans, and Pumps I II
M M M
Efficiency
measurement
Efficiency
measurement
Voltage/
current range
5 MHz
Voltage/
current range
5 MHz
6