Yageo KEMET User manual

User Guide –Vibration Analysis Setup for KEMET Vibration Sensors
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide. 1
© KEMET Electronics Corporation •One East Broward Boulevard •Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Vibration Analyses Setup
for KEMET Vibration Sensors
User Guide
Rev. 1.1
DEC 2021

User Guide –Vibration Analysis Setup for KEMET Vibration Sensors
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide. 2
© KEMET Electronics Corporation •One East Broward Boulevard •Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
1 VIBRATION SENSOR SETTING PROCEDURE
1.1 Identification of Sensor Installation Location
KEMET vibration sensors should be placed within the system to maximum exposure to
potential vibration. Attention to the direction of vibration should also be taken care of by the
placement of the sensors. The three main modes of vibrationthat we encounter are rotational,
longitudinal and horizontal. Please ensure that your choice and placement of the vibration
sensor is suitable for the modes and frequencies that you expect may occur.
1.2 Selection of Mounting Method
Depending on the device you have selected, you have several options on how to affix the
sensor to your system. These range from mechanic bolt options to strong adhesive tapes.
If adhesives are to be selected, please ensure that your selection will not fail under normal
operating conditions. For example, epoxy resin can crack or fatigue and silicon adhesive can
dampen the motion of vibration. Often it is better to select a thin but very sticky adhesive tape.
1.3 Noise Confirmation and Countermeasures
As with any accurate analogue sensor, care must be taken with regard to Signal to Noise
ratios, so please pay particular attention to suitable signal conditioning with regard to power
supplies and the output signal of the sensor.
1.4 Threshold Setting
Once you have positioned your sensor within thesystem to maximize the exposure topotential
vibration, KEMET recommends that you employ analog or software differential signaling
techniques in order that "normal" levels of vibration can be differentiated from "abnormal" or
unexpected vibrations.
1.5 Final Verification
To conclude the setup, obtain confirmation of reproducibility and variation, and complete
appropriate verification of threshold.
2 IDENTIFICATION OF SENSOR INSTALLATION LOCATION
2.1 Sensor Mounting Direction
The direction in which the vibration increases changes, depends on the type of abnormality.
ISO recommends mounting the vibration sensor in the axial, vertical, and horizontal
directions of the measurement target.
If you want to install the vibration sensor in one place only, select either axial, vertical or
horizontal. Alternatively, install it in the direction in which the vibration of the measurement
target increases.

User Guide –Vibration Analysis Setup for KEMET Vibration Sensors
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide. 3
© KEMET Electronics Corporation •One East Broward Boulevard •Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Pedestal Type Bearing
Housing Type Bearing
Small Rotating Equipment
Figure 1 –Types of Structures and Equipment
2.2 Sensor Mounting Location
The frequency performance of the sensor is highly dependent on the method of installation.
The sensor must be secured tightly on a flat, hard surface. It should be positioned closest to
the measurement point.
OK
AVOID
Flat Surface
Curved Surface
Uneven Surface
Foreign Matter Pinched
Figure 2 –Using the Right Surface
Object to be Measured: Motor
Figure 3 –Choosing the Right Location (Example)

User Guide –Vibration Analysis Setup for KEMET Vibration Sensors
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide. 4
© KEMET Electronics Corporation •One East Broward Boulevard •Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
3 SELECTION OF MOUNTING METHOD
3.1 Sensor Fixing Method
The frequency performance of the sensor largely depends on the installation location and
fixing method. The fixing method should be selected according to the measurement
frequency.
Magnet –Uneven Surface
Magnet –Flat Surface
Thin Double-Sided Tape
Screw Fixing
Figure 4 –Fixing Methods
Figure 5 –Fixing Method and Frequency Characteristics
If you need to measure high frequencies, it is recommended to fix the sensor with screws.
Figure 6 –Measured Value (VS-JV10A)

User Guide –Vibration Analysis Setup for KEMET Vibration Sensors
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide. 5
© KEMET Electronics Corporation •One East Broward Boulevard •Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
3.2 Cable Fixing Method
Please use the following with caution in order to obtain correct measurement and stable data.
•Secure the cables at appropriate intervals to minimize cable vibration.
•Select the cable layout and fixing so that tension is not applied.
•Do not bend the cable more than necessary (keep the minimum bending radius).
Figure 7 –How to Fix the Cable Correctly
3.3 Fixing the Sensor VS-JV10A
Fixing Method
Fixing Description
Pros and Cons
Adhesive fixing
Apply thin layer to the
entire bottom surface
Suitable for high frequency
measurement
Difficult to attach or detach the sensor
Double-sided tape
Hard and thin
material is
recommended
High frequency measurement is also
possible (depends on the material of
the tape)
Be careful of changes over time
Screw
Recommended
torque 1.5N・m
Add adhesive to
prevent screws from
loosening
Suitable for high frequency
measurement
Need to embed screws
Mounting stud
Easy to attach or detach the sensor
Mounting stud stabilizes the fixed
surface and reduces the effects of
strain
Need to embed screws (fixing screws)
Magnet base
Easy to attach or detach the sensor
Not recommended for high frequency
measurements
Make sure the installation surface is flat and smooth, it must also be free of burrs and foreign
matter. Please remove oil and dirt on the adhesive surface. After applying a thin coat of
adhesive, press gently to bond.

User Guide –Vibration Analysis Setup for KEMET Vibration Sensors
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide. 6
© KEMET Electronics Corporation •One East Broward Boulevard •Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
3.4 Fixing the Sensor VS-BV203
Fixing Method
Fixing Description
Pros and Cons
Adhesive fixing
Apply thin layer
to the entire
bottom surface
Suitable for high frequency
measurement
Difficult to attach or detach the sensor
Double-sided tape
Hard and thin
material is
recommended
High frequency measurement is also
possible (depends on the material of
the tape)
Be careful of changes over time
4 NOISE COUNTERMEASURES
4.1 Is There Any Power Supply Noise ?
Using an Oscilloscope or spectrum analyzer it should be possible to see the frequency
spectrum of the signal output. It will become apparent if you have 50/60 Hz mains noise
present. Careful grounding or EMI shielding methods can be deployed to minimize these
effects.
Figure 7 –FFT Example of Vibration Sensor
Figure 8 –Connection Checkpoint

User Guide –Vibration Analysis Setup for KEMET Vibration Sensors
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide. 7
© KEMET Electronics Corporation •One East Broward Boulevard •Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
4.2 Noise Countermeasures for VS-BV203
Power Supply Noise
Connect the power supply to a stable power supply separated from the equipment, such as
batteries or other non-switching "linear" power supplies.
Figure 9 –In Case of Noise from the Power Supply
If there is a noticeable difference in the output signal, then the power supply can be considered
the potential cause of electrical noise. If this is the case, we recommend deploying EMI
countermeasures on the supply lines.
Installation Surface Noise
Attach or detach the housing to or from the measurement surface.
Figure 10 –In Case of Noise from the Installation Surface
If effective, the noise can be considered as coming from the installation surface. KEMET
recommends, in that case, to use the sensor VS-JV10A, chassis insulation type.
Cable Noise
Cover the entire cable with screening and attach to a ground point at the measurement side
of the cable. An alternative is to deploy ferrite countermeasures on the cable to reduce
electrical noise. Care must be taken to ensure that any ferrite placed on the cable should not
dampen or reduce the magnitude of the electrical vibration signal.
Figure 11 –In Case of Noise from the Cable
If it works, the origin of the noise can be considered as coming from the cable. KEMET
recommends, in that case, to use the sensor VS-JV10A, as its cable has a strong shield and
is effective as a noise countermeasure.
4.3 Noise Countermeasures for VS-JV10A
Refer to Figure 12 for the connection between the sensor, power supply unit and
measurement unit.

User Guide –Vibration Analysis Setup for KEMET Vibration Sensors
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide. 8
© KEMET Electronics Corporation •One East Broward Boulevard •Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
•SG and case FG are
separated (insulated).
•SG is closed with a
shield.
•Shield and case FG
are connected.
Even if it is installed on the
external FG as it is, it will be
insulated from the SG.
•If you do not need to
separate FG and SG,
connect to SG.
•When separating FG
and SG, open or
connect to FG.
Please select the connection
destination according to the
noise situation.
Figure 12 –Connection Example
Thus, we can consider 4 patterns to solve noise issues through ground connection when using
the sensor VS-JV10A.
1. The signal ground (SG) and frame ground (FG) are separated.
Figure 13 –Pattern 1 Standard System
2. When the noise of the frame ground (FG) is small enough.
Figure 14 –Pattern 2

User Guide –Vibration Analysis Setup for KEMET Vibration Sensors
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide. 9
© KEMET Electronics Corporation •One East Broward Boulevard •Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
3. When the noise of the frame ground (FG) is large.
Figure 15 –Pattern 3
4. Measures against ground loops.
Figure 16 –Pattern 4
5 THRESHOLD SETTING
5.1 Sensor Diagnosis Method
Recommended Set-up and Analysis Methods
Measure a known working system "deemed to be of full working condition" and obtain several
"reference" frequency spectrum levels where vibration magnitude and frequency levels can
be assessed. These levels should be considered "normal" operation or background
vibrations. Your analysis system should now consider deviations from this reference data an
indication of unwanted vibrations or of a potential mechanical failure.
As a guide, set a threshold value that is at least 4 times the standard value. It compares the
measured values and judges whether it is good or bad.
Judgement
Threshold Setting
Good
Less than twice the standard value
Caution
2 to 4 times the standard value
Risk
4 times or more of the standard value
The above threshold settings are for reference only.

User Guide –Vibration Analysis Setup for KEMET Vibration Sensors
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide. 10
© KEMET Electronics Corporation •One East Broward Boulevard •Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
6 FINAL VERIFICATION
6.1 Examples of Damage to Rotating Machines
Figure 17 shows a simplified representation of a rotating machine, and Figure 18 details
examples of damages to such machinery and how the detection sensor can pick up vibrations
related to these examples.
Figure 17 –Rotating Machine Example
Frequency
Band (Hz)
Damaged Part
Damage Details
Detection Sensor
3k –10k
Bearing
Abrasion, burnout
Vibration, acoustic,
sound, heat
1k –5k
Gear
Missing tooth, gears do not mesh
Vibration, acoustic
50 –200
Coupling
Misalignment
Vibration, heat
30 –100
Rotating equipment
Unbalance
Vibration
10 –50
Fixed base
Rattle, loose fixing bolt
Vibration
Figure 18 –Fast Fourier Transform (FFT) Output

User Guide –Vibration Analysis Setup for KEMET Vibration Sensors
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide. 11
© KEMET Electronics Corporation •One East Broward Boulevard •Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
6.2 Sensor Comparison Calibration Method
The vibration sensor is measured according to the comparative calibration method.
In the comparative calibration method, the standard sensor and the measurement sensor are
overlapped and vibrated. This method allows measurement of the output sensitivity by
comparing the difference between the two sensors’outputs.
As shown in Figure 19, if the standard sensor has sufficient rigidity, exactly the same vibration
will be applied to both sensors.
Figure 19 –Comparative Calibration Method with Screw Fixing
If unsuitable fixing methods are used, analysis will reveal a difference in signal magnitude
and/or frequency (see Figure 20). Differences will occur in the measured values and errors
will occur in the frequency characteristics and sensitivity.
Figure 20 –Comparative Calibration Method with Screw Fixing