Motors & Drives

Offering the world’s highest level of power measurement accuracy, the WT3000E provides engineers with a solution for testing and verifying Product Efficiency to the highest levels. Advanced and innovative measurement functions will benefit the engineer with electrical power measurements. It provides the measurement solutions necessary in the design and testing of the latest products such as Solar Inverters, Motor Drives, Lighting Systems, Uninterruptible Power Supplies, Transformer Testing, Aircraft Power Systems, and other power conversion devices.

Select the model most suited to your measurement needs

• High accuracy and wide frequency range
  Basic power accuracy
  ±(0.01% of reading + 0.03% of range)
  frequency range
  DC, 0.1 Hz to 1 MHz

• Low power factor error
  Power factor error when cosø=0
  0.03% of S
  S is reading value of apparent power
  ø is phase angle between voltage and current

• Current range
  Direct input
      0.5/1/2/5/10/20/30 [A] or 5/10/20/50/100/200/500 [mA], 1/2 [A]
      *2A and 30A input elements can be installed together in a unit.

• External input

  50m/100m/200m/500m/1/2/5/10 [V]*

• Voltage range
      15/30/60/100/150/300/600/1000 [V]
      * Voltage range and current range are for crest factor 3

  • 1000 [Vrms] Continuous maximum common mode voltage (50/60 Hz)
  • Data Update rate: 50 ms to 20 sec
  • Effective input range: 1% to 130%
  • Simultaneously measurement with 2 Units

Rear Panel

Characteristics

Example of basic characteristics showing the WT3000E’s high precision and excellent stability

 

Supports Crest Factor 6

The crest factor is the ratio of the waveform peak value and the RMS value.

 When checking the measurable crest factor of our power measuring instruments, please refer to the following equation.

* However, the peak value of the measured signal must be less than or equal to the continuous maximum allowed input

* The crest factor on a power meter is specified by how many times peak input value is allowed relative to rated input value. Even if some measured signals exist whose crest factors are larger than the specifications of the instrument (the crest factor standard at the rated input), you can measure signals having crest factors larger than the specifications by setting a measurement range that is large relative to the measured signal. For example, even if you set CF = 3, CF5 or higher measurements are possible as long as the measured value (RMS) is 60% or less than the measuring range. Also, for a setting of CF = 3, measurements of CF = 300 are possible with the minimum effective input (1% of measuring range).

Store Function (Comes Standard with WT300E)

Voltage, current, power, and other measured data can be stored to the unit's approximately thirty megabytes of internal memory. These data can be saved in binary or ASCII format on a PC card or USB memory*.

* The USB port (for peripherals) comes with the /C5 option.

 

Each measured item can be stored every data update interval. You can specify to store only the desired measured items, thus saving memory.

 

Files saved in ASCII format can be opened in general-purpose applications such as Excel allowing display of data in graphs. * Please note that data saved in binary format can only be manipulated using dedicated software to be made available by Yokogawa.

Excel Example

When you purchase a WT3000E from Yokogawa, you get to select just the options you need. This approach lets you maximize performance at a lower cost.

Advanced Calculation Function (/G6 option) 

The Advanced Calculation Function (/G6 option) provides for wide bandwidth harmonic measurement, IEC compliant harmonic measurement (requires harmonic measurement software), FFT calculation, waveform calculation functions, and saving of waveform sampling data.

Wide Bandwidth Harmonic Measurement Mode
Harmonic measurement for a frequency range of 0.1 Hz – 2.6 kHz

*1 0.1–10 Hz using an external sampling clock.
*2 Harmonic measurement of up to the 20th order possible in the 1 kHz to 2.6 kHz range.

Harmonic Measurement Function
Harmonic and normal power parameters measurement at same time

IEC Harmonic Measurement Mode
Can perform tests conforming to international standards.

* These modes cannot be used at the same time.

FFT Calculation Mode
More detailed frequency analysis than with the harmonic measurement mode.

Waveform Calculation Mode
Monitoring of instantaneous power waveforms.

Waveform Sampling Data Saving Function 
Saving of detailed waveform data for confirmation.

Calculation of motor and total efficiency  In addition to the functions of the standard version, the new models offer powerful motor/inverter evaluation functions Voltage, current, and power measurement with torque and speed input  Measures torque meter and speed sensor output (analog or pulse output), and allows calculation of torque, revolution speed, mechanical power, synchronous speed, slip, motor efficiency, and total efficiency in a single unit.

Added Frequency Measurement (/FQ) 

In addition to the standard two channels of frequency measurement, a six-channel frequency measurement option is also available. This option provides frequency measurement of voltage and current on all eight channels (with input elements 1 through 4 installed). This is necessary when you want to measure voltage and current frequency from the instrument’s I/O as well as voltage and current frequencies of multiple items under test at the same time. 

D/A Output (/DA) 

Outputting measurement values as analog signals to other devices 

Built-in printer (/B5) 

The optional built-in printer is installed on the front side of the WT3000E, so it is easy to use even if the WT3000E is mounted on a rack. The printer can be used to print data and waveform memos.

The Auto Print function allows you to set a time interval at which measured values are automatically printed on the built-in printer. You can also set a start and stop time in order to record data over a desired time period. You can also specify to print only the desired measured items. 

Video output for viewing on a larger screen 
The VGA port can be used to connect an external monitor in order to view numerical value data and waveforms on a larger screen. This capability is useful if you want to simultaneously check large amounts of data on a separate screen, or view data in a separate location.

Serial (RS-232) (/C1) 

USB Port for Peripherals (/C5 Option) 

A USB port for peripherals with type A connectors can be included with the WT. The various kinds of data stored in the main unit such as voltage, current, and power, can be saved in binary or ASCII format on a peripheral such as a USB memory. You can also connect a keyboard for easy input of user-defined math expressions.

USB Port for Connection to PC (/C12 Option)) 

The USB port (type B connector) on the rear panel of the WT3000E allows data communications with a PC¹. Also, instruments with this option installed can be used in conjunction with the communication functions of PC application software for data acquisition via USB².

* USB stands for universal serial bus. USB is a standard designed to provide connectivity across a wide range of PC peripherals and other devices through the use of a common communication mechanism. 

Ethernet Communication Function (/C7 Option) 

* The WT3000E does not have a built-in hard disk. The FTP server function is available when a PC card or USB memory is inserted or connected to the PC.

 

This function enables measurement of voltage fluctuations/flicker in compliance with EN61000-3-3 and IEC61000-3-11. It can measure relative working voltage change, maximum relative voltage change (dmax), relative voltage change time (dt), short-term flicker value (Pst), and long-term flicker value (Plt). The initial limit values for the individual parameters are set in accordance with the IEC standard.

         

Support for IEC and JIS Standards Testing

WT3000 Precision Power Analyzer Brochure