The Yokogawa CW500 is a portable power meter that utilizes current clamp-on probes, easy to use navigation screens and bluetooth and SD cards for communication and data logging. These features enable user-friendly power consumption and power quality measurements in the field that conform to IEC61000-4-30 Class S. This standard dictates that two measuring instruments of similar rating must measure within some percentage of each other when exposed to the same signal.
Utilities and substations contain large arrays of transformers, generators and electrical distribution networks. To maintain the health and safety of such infrastucture, a reliable power quality analyzer is needed. This power quality analyzer should be capable of not only logging single to multi-phase power, but also trend and monitor anomalies in the power system such as voltage sags,swells and dips, as well as flicker, inrush current, and demand changes. The CW500 power quality monitor is perfectly suited for this task due to its:
Quick Start Guide Function:
Measure Temporary Malfunctions of the Power Line
Measure Continuous Malfunction of the Power Line
CW500Viewer (Included PC software)
Types of data
Memory card and interface
Power line and Input Channel: 3 CH Voltage, 4 CH for Current Clamp Probe.
1P2W (up to 4 systems), 1P3W (up to 2 systems), 3P3W2current (up to 2 systems), 3P3W3current, 3P4W
Power measuring item:
Instantaneous, average, maximum, and minimum values for each setting period:
Voltage/Current/Power (Active, Reactive, Apparent)/Power Factor/ Phase Angle/Frequency/Calculated Phase Shift Capacitance/DC voltage value 2 CH.
Energy (active, reactive, apparent), Demand (list or graph display of change in a specific period and as a whole)
Recording Interval Period
1/2/5/10/15/20/30 second, 1/2/5/10/15/20/30 minute, 1 hour/2 hours
Manual, time, period
Estimated Recording Length with 2 GB SD card
Various Measuring Screen
List display, zoom display by 4 or 8 divisions, trend graph display, integration value display for energy, demand list display of value, demand graph display for change of period, demand graph display for whole recording
Hems of measuring values can be selected with position.
Zoom display can be selected by 4 or 8 divisions.
Trend graph of voltage/ current/power/power factor/frequency/ advanced phase condenser external DC voltage.
List of active, apparent, reactive by consumption or generation.
Demand is the average power value of a specific period (usually 30 minutes). The contract with the power supplier conditionally concerns the maximum average power value between a period for the consumption fee. This function supports how to maintain within the target consumption by monitoring the estimated demand value to the setting rate with the maximum demand value.
List of Demand Value
Graph display of change on specific period
Graph display of whole demand trend
Trend analysis graph
Sample of report
Power Quality Function
Short period power line malfunctions such as voltage swells, dips, interruptions, transients, over or inrush currents, or long periods of harmonic distortion/flicker may damage or reset your devices.
The CW500 helps to identify each of those short period malfunctions by recording occurrence time, occurrence finish time and waveforms. Additionally there is a digital output on occurrence.
Long period malfunctions can be analyzed by harmonics, flicker, waveform, or by checking on the unbalance rate calculation for a 3 phase measurement.
All data can be finalized into a report format with the included software. The CW500 conforms to the IEC standard of 61000-4-30 Class S.
Quick start guide and automatic type of clamp recognition
The quick start guide will show on-start measuring and how to wire and set the range before measuring. The automatic clamp detection will insure the settings are correct.
Start of guidance
PUSH the “START/STOP” key.
Select “Quick start guide”.
Select recording item.
Select the wiring and the appropriate connection diagram will be displayed.
Wiring check/self diag./self id.
Wiring check, self-check and the type of clamp is automatically detected and the results displayed.
If NG is displayed, the detail can be confirmed by pressing the “ENTER” key.
Set the recording interval time and the recording time or period.
Power supply from measuring line
Power (under 240 VAC) can be supplied by using the power supply adapter (sold separately).
Note: This is not available for EV region.
Leakage current measuring
The external magnetic field effect is 0.002 A or less, at 400 A/.
Yokogawa’s proprietary technology has achieved a magnetic field impact amount of 30 ppm even in adjacent power lines (at 100 A).
Below is an example of how to measure a neutral line of 3 phase 4 line.
Multiple line measuring
4 system load measuring
Maximum of 4 systems is capable for 1 phase 2 line Maximum of 2 systems is capable for 1 phase 3 line or 3 phase 3 line.
Data analysis, data reporting, making a setting file and doing a real time measurement can be easily done with the CW500Viewer.
The data can be transferred by SD memory card, USB communication or Bluetooth communication (for USA, Canada, Japan only).
The graph and lists are created by a click on the data file.
Real time measurement
Examination of main power line quality for factory system control and assets
The CW500 not only continuously measures harmonics but it also captures malfunctions of the power line and records the occurrence time with waveforms. Simultaneously, it can measure the power and leakage current of a neutral phase. Additionally, users can confirm the condition of assets when signals are connected to the DCV input channels.
Checking Energy Efficiency of LED lighting
Verify the energy saving effects of LED lighting compared to standard incandescent lighting by performing before and after measurements.
Checking power consumption of driving pumps of a manufacturing line
Inverters were installed on many driving pumps in liquid manufacturing lines, and power consumption measurements are needed to check the before and after effects.
Multiple parameters can be set and measured by the PC software. Additionally, the power line quality can also be tested to assure the new inverters can be operated safely.
Purpose: Investigation of the cause of constant malfunctions for printing machines.
Harmonics distortion on line could be the reason?
Measuring: CW500 key features
Result: Confirming high level harmonic contents on 5th and 7th.
Many damaging harmonics are discovered in the 5th and 7th harmonics. 5th harmonic content can damage the calculation of capacitance for improving power factor.
Improving the power factor for power efficiency
The CW500 can calculate the appropriate capacitance value by setting the aimed power factor value.
By setting the proper capacitance calculation and improving the power factor, users will benefit from power savings with less load current and improve the capacity of the whole power system.
φ40 mm AC 2 A, Leakage current measurement.
φ18 mm AC 50 A, Load current measurement.
φ24 mm AC 100 A, Load current measurement.
φ30 mm AC 200 A, Load current measurement.
φ40 mm AC 500 A, Load current measurement.
max. approx. 110 mm
AC 1000 A flexible type load current measurement
max. approx. 150 mm
AC 3000 A, 3 CH Load current measurement.
Power supply from measure line(100 to 240 V)
Case with magnet
for 96030, 96033, 96036
CW500 and Clamp-on probe can be contained
2 GB SD Memory Card
1 set 4 pcs Red Black White Blue Ø 4 mm Approx. 3 m
Extension cable for Clamp-on Probe
With increased focus on reducing energy consumption and compliance with efficiency standards, this app note provides an overview on the types of measurements needed for efficiency and power quality, and the instruments that take them.
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