Motor Current Analysis with a vbSeries Instrument 1 GE Measurement & Control Motor Current Analysis with a vbSeries Instrument This article walks you through conducting motor current analysis with a vbSeries portable vibration analyzer. It explains how to: • Set up your current sensor • Set up the measurement • Take the measurement Set up Current Sensor Assuming you are using a Fluke i400 current clamp or similar product, this explains how to set up for 1mV/A or 10 mV/A. This depends on 40A or 400A maximum scaling — We will assume 1 mV/A. To set up your instrument for the current sensor: 1. Press Options on the main menu > Press Sensor Setup. 2. Press Change Sensor > Press Create New Sensor. TIP: Press to see the button labels. 3. Use the buttons provided to select the sensor settings shown in this image: NOTE: In this example the sensor is named “Current”, however you can choose another name if required. Setting up your sensor for motor current analysis 4. Press to save your settings and select the sensor.
Transcript
Motor Current Analysis with a vbSeries Instrument 1
GE Measurement & Control
Motor Current Analysis with a vbSeries Instrument
This article walks you through conducting motor current analysis with a vbSeries portable vibration analyzer. It explains how to:
• Set up your current sensor • Set up the measurement • Take the measurement
Set up Current Sensor
Assuming you are using a Fluke i400 current clamp or similar product, this explains how to set up for 1mV/A or 10 mV/A. This depends on 40A or 400A maximum scaling — We will assume 1 mV/A.
To set up your instrument for the current sensor:
1. Press Options on the main menu > Press Sensor Setup.
2. Press Change Sensor > Press Create New Sensor.
TIP: Press to see the button labels.
3. Use the buttons provided to select the sensor settings shown in this image:
NOTE: In this example the sensor is named “Current”, however you can choose another name if required.
Setting up your sensor for motor current analysis
4. Press to save your settings and select the sensor.
Motor Current Analysis with a vbSeries Instrument 2
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Set up Measurement
To select the measurement settings:
1. Press or Measure on the main screen.
2. Press Spectrum Waveform > Press Store Units.
3. Select Current > Press .
4. Use the buttons provided to select the measurement settings shown in this image > Press to save your settings.
Setting up a measurement for your current sensor
5. Press Spectrum Waveform > Press Spec Wfm until the Spectrum setting displays > Press
to save your settings.
Toggling to select Spectrum while setting up your measurement
6. Press .
Motor Current Analysis with a vbSeries Instrument 3
GE Measurement & Control
7. Toggle the buttons provided to select the final measurement settings shown in this image:
Selecting the final settings for your measurement
NOTE: With the low Fmax value of 100 Hz and choice of 1600 lines, this is a 16 second measurement at a minimum. A higher number of averages or lines of resolution will take proportionally longer to complete the measurement.
8. Press — You are now ready to hook up the current clamp and take your measurement.
Motor Current Analysis with a vbSeries Instrument 4
GE Measurement & Control
Take Measurement
Once you have selected and saved your measurement settings you will be prompted to connect your current sensor and start taking your measurement. To do this:
1. Connect your current sensor — The measurement will start (open circuit, no sensor here). The data collection screen will display.
Taking a 16-channel measurement
Live measurement
2. Press Press Log.
Screen that displays when you press ALT
Motor Current Analysis with a vbSeries Instrument 5
GE Measurement & Control
3. Press again to change from Linear to Log.
Changing from Linear to Log
4. Press — The data collection screen displays.
Live measurement in dB
5. Press to freeze the screen for analysis — The View label displays in the top right corner.
Freezing the screen for analysis
Motor Current Analysis with a vbSeries Instrument 6
GE Measurement & Control
6. Use the dual cursors to examine the left Pole Pass Frequency (PPF) presence relative to Line Frequency (LF) in delta dB.
NOTE: “Open air” data is shown in this example — No sensor is attached.
