KEW 5010

Application Notes and Useful Tips

Insulation Level Monitoring by checking the leakage current

• Detect an intermittent leakage current as often this is unpredictable.
• Check for nuisance tripping of an RCD/ELCB due to a leakage current. Check also if RCD is tripping at its rated tripping current.
• Check for the presence of harmonics. Use 2 clamp sensors (one per channel) on same line and use the filter function on one clamp sensor. A difference in values between the 2 channels will indicate the presence of harmonics. In this way the source generating harmonics can be traced.

Monitoring the load current

• Confi rm the stability of a load (eg. motor) and the distortion it causes to the current by detecting accurately the over load caused for example by an inrush (starting) current and a surge current.
• Check for phase imbalance (in a 3 phase system) 
• Rate switchgear appropriately by measuring the peak current and the inrush current.
• Analyze voltage drop due to starting current and thus compensate accordingly.

Monitoring overall electrical power of production line at factories or each floor at buildings

4 recording modes make various measurements possible

Normal recording mode

For monitoring power line status or an intermittent leakage.

• Records the variation of the current in a given interval (For monitoring the variation of the current against time.)
• A choice of 15 recording intervals are available: 1 sec. to 60 min. 
  (1,2,5,10,15,20,30 sec, 1,2,5,10,15,20,30,60 min.)
• The average of the measured value in every recording interval is recorded. The Max., Min. and Peak values (sampled crest value converted to sine RMS value) are recorded every 10 readings.

Trigger recording mode

For observing an irregular operation of an ELCB/RCD, an irregular current.

• Detects the value, time and frequency of the current when the preset value is exceeded.
• When the detection level (i.e. preset value) is exceeded, 8 data points (True RMS values for approx. 0.8 sec) and peak value are recorded before and after the preset value is exceeded.
• Inrush current or an abnormal current can be detected by sampling the inputs at every 1.6ms.
• LED flickers when the measured values exceed the preset current value.

Capture recording mode

For observing waveforms easily. 

• Waveform display via a PC by sampling the inputs every 0.55ms.
• When the preset current value is exceeded, instantaneous values are recorded for 200ms (from 10(50Hz) to 12 (60Hz) waveforms) before and after preset value is exceeded.
• LED flickers when the measured values exceed the preset current value.

Large capacity for storing 60,000 data points

60,000 data points can be recorded when 1ch is used, and when all the three channels are used, 20,000 data points per channel can be recorded.

MAX.number of recorded data

Using all 3 channels	Using 2 channels	Using only 1 channel
20,000 data	30,000 data	60,000 data

Max. recording duration

Recording interval	Using all 3 channels	Using 2 channels	Using only 1 channel
1 sec.	5:33:20	8:20:00	16:40:00
2 sec.	11:06:40	16:40:00	1 day　  9:20:00
5 sec.	1 day　  3:46:40	1 day　17:40:00	3 days　11:20:00
10 sec.	2 days　  7:33:20	3 days　11:20:00	6 days　22:40:00
15 sec.	3 days　11:20:00	5 days　  5:00:00	10 days　10:00:00
20 sec.	4 days　15:06:40	6 days　22:40:00	13 days　21:20:00
30 sec.	6 days　22:40:00	10 days　10:00:00	20 days　20:00:00
1 min.	13 days　21:20:00	20 days　20:00:00	41 days　16:00:00
2 min.	27 days　18:40:00	41 days　16:00:00	83 days　  8:00:00
5 min.	69 days　10:40:00	104 days　  4:00:00	208 days　  8:00:00
10 min.	138 days　21:20:00	208 days　  8:00:00	416 days　16:00:00
15 min.	208 days　  8:00:00	260 days　10:00:00	520 days　  0:00:00
20 min.	277 days　18:40:00	416 days　16:00:00	833 days　  8:00:00
30 min.	416 days　16:00:00	625 days　  0:00:00	1250 days　  0:00:00
60 min.	833 days　  8:00:00	1250 days　  8:00:00	2500 days　  0:00:00

Continuous measuring time : Approx. 10 days (Alkaline Battery)
* Max recording time is dependent on battery life (approx 10-days with Alkaline battery)
* Use of optional AC Adopter is recommended for long time recording.

LED flickers when the preset current value is exceeded.

• Available for Trigger / Capture Recording modes.
• LED on the Sensor connected channel blinks when following Trigger is detected.
• LED flashes whenever the measured values exceed the pre-set detection level during measurements.
  Trigger is detected when the measured values exceed the pre-set detection level under Trigger / Capture Recording Mode.

CALL : Confirmation of recorded data

• The following can be displayed: number of recorded data points, (max+ min+ peak) value for each  channel complete with time/date information in the Normal recording mode. (Detected values (i.e. when values are outside preset limits) can be displayed in other recording modes)
• RECALL: The last 10 recorded data points including time/date can be recalled on the logger display.

Selection of One-time mode or Endless mode

• One-time on: 
  Recording will stop when memory is used up.
  
  
• One-time off: 
  Over write the old data, and store the latest data.

Battery power indicator

• Indicates battery voltage in 4-levels.
  (It is possible to use the logger for a further approx 24 hours even after the warning symbol is fl ashing.)
  
  
  
• Recorded data will be retained even if the batteries are exhausted or replaced due to the presence of a nonvolatile memory (guaranteed for 10 years)

Analyzing and processing the recorded data with a PC

Easy to set up with a PC

• User-friendly PC software "KEW LOG Soft2" is available.
• The recorded data is downloadable onto a PC via USB cable.
• Via the software the following parameters can be set: time/date, recording intervals, the start of recording, recording methods, name of monitoring site and comments.
• The type of the sensor connected to the logger will be automatically recognized.
• Just click appropriate dialog boxes for set up if it is not required to input any comments.
• By using commercially available USB hub, multiple loggers can be connected to a PC and can set the synchronized time.

Large data can be easily processed

• Recorded data can also be converted to CSV files, and data can be processed in Excel.

Graphical display

 

Simplified Power Integration

• The PC software “KEW LOG Soft 2” provides easy calculation of integral power consumption.
  (Single-phase 2-wire, Single-phase 3-wire, Three-phase 3-wire, Threephase 4-wire)
  * Simplifi ed power integration function is available for the data recorded under Normal Recording mode.

■Normal Recording Mode (AC 50/60Hz, Sine wave, Input: 10% or more of the range at CH1)

*Max, Min and Instant Peak values in Normal Recording mode are just reference values:
their accuracies aren't guaranteed.

■Trigger Recording Mode (AC 50/60Hz sine wave)

■Capture Recording Mode

Please download “KEW LOG Soft2(software)” from here.

*1-4: Can use with after the following serial numbers.
　*1:8125 No.02637-
　*2:8126 No.00151-
　*3:8127 No.00181-
　*4:5010 No.8029792-