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MMF VM25, Инструкция по эксплуатации

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MMF VM25 Скачать руководство пользователя страница 21

To deliver the service staff on site a report about the periodic changes in vibration
severity and consequently the previous history of the measurement point concerned,
the VM25 provides a graphical trend display. The prerequisite for retrieving  graphi-
cal trends is placing the sensor on the relevant VMID. The trend display is obtained
by pressing the F1 key (Figure 24).
The trend display only takes values from the data memory into account which be -
long to the VMID operation mode currently active. If the VMID operation mode is
changed (cf. Chapter  6.3.3), the previously saved data with a different  operation

mode will not be shown in the trend display.
The vertical axis indicates the RMS of the vibration quantity and the horizontal axis
indicates time. The K(t) values are represented by the vertical axis K(t). Both are
scaled to their respective maximum value. The time axis shows the interval between
the first and last saved measurement. Below the diagram there is a red marker. This
can be moved horizontally to read the magnitude, using the◄►  keys. The marker
only skips forward to time points which already have a measurand. At each data
point the date and time of the measurement as well as the measured RMS or K(t)
value are displayed. Above the diagram the text assigned to the measurement point
is displayed. In order to be able to display trends, the points are joined together by a
line. 
Press F3  to exit the trend display.
If only one or zero measurands for a selected measurement point can be located in
the memory, the error message “Too few data for trending” will appear instead of the
trend graphic.
Note: The available PC software enables you to view the trends more conveniently,
even without it being connected to the measuring point .

6.6. Viewing Saved Measurement Values

In addition to the graphical trend readings for current measurement points, saved
measurement data can be viewed in text format. Open the main menu by pressing
F3, then select the sub-menu option “Meas. data Memory”. From within the sub-
menu select “View meas. data memory”. The measurement data can be viewed in or-
der of the VMID serial number or the date it was saved. Select your preferred menu
option using keys ▼▲ and press OK to confirm. The first data record will now be
displayed.  At  the top,   a  consecutive   number and the  number  of the  data record
within the memory will also be shown. Below these, the measuring point serial num-

19

Figure 24: Trend display

Содержание VM25

Страница 1: ...Manfred Weber Metra Mess und Frequenztechnik in Radebeul e K Meissner Str 58 D 01445 Radebeul Tel 49 351 836 2191 Fax 49 351 836 2940 Email Info MMF de Internet www MMF de Vibration Meter VM25 Valid f...

Страница 2: ...91 Fax 49 351 836 2940 Email Info MMF de Internet www MMF de Note The latest version of this manual can be found at http www mmf de product_literature htm Specification subject to change 2012 Manfred...

Страница 3: ...5 3 1 How the VMID Measurement Point Functions 14 5 3 2 Mounting the VMID Measurement Point 14 6 Measurement 15 6 1 Measurement Value Display 15 6 2 Selecting the Display Quantity 15 6 3 Measurement P...

Страница 4: ...tion to a PC 33 13 1 Device Driver 33 13 2 VM2x Measurement Database 34 13 3 Export of FFT Data to a PC 35 13 4 Firmware Update 36 14 Technical Data 38 Limited Warranty 40 2 Figure 1 VM25 with vibrati...

Страница 5: ...point detector VMID which enables it to take routine measurements of a large number of measurement points very effectively A software package for transferring the measurement data to a PC is also ava...

Страница 6: ...oller The micro controller also controls the graphic display the infrared thermometer the rotation speed sensor the USB communica tion and storing of measurements 3 Measuring Ranges 3 1 Measurable Vib...

Страница 7: ...arings can be monitored whilst vibrational unbalances are attenuated 3 3 Vibration Velocity Measuring vibration velocity is a common procedure for assessing the running smooth ness of rotating machine...

Страница 8: ...d by the sen sor The following formula applies to sinusoidal signals v a 2 f It is evident that in the case of constant acceleration a the value of velocity v drops at higher frequencies f As a conseq...

Страница 9: ...easurement values be cause of the double integration On the other hand frequencies in the range of less than one hundred Hertz are so strongly dampened that an evaluable display value is no longer rec...

Страница 10: ...guidelines It is formed by the RMS and peak value of acceleration at a frequency range of 1 to 10 kHz The 1 kHz high pass filter ensures that the rolling bearing signal is not overlapped by the vibrat...

Страница 11: ...eed by means of an inbuilt contactless optical sensor Figure 34 on page 25 To enable this the instrument needs to be aligned with the rotating part for which a laser pointer can be used to help with t...

Страница 12: ...Remove old batteries from the instrument and take out the batteries if the instru ment will not be used for a long period of time Otherwise leaking battery acid may cause severe damage to the instrum...

Страница 13: ...n menu by pressing F3 and scroll through the menu options by repeatedly pressing the button until you reach In strument Settings then press OK Within the sub menu select Battery type Figure 11 by foll...

Страница 14: ...able to record machine vibrations near to their source This helps to reduce distortion of the measuring signal to a minimum when it is being carried through transmission parts Suitable measurement poi...

Страница 15: ...recommendations for measurement points on various machine type Figure 13 Measuring points on vertical bearings Figure 14 Measuring points on flange bearings Figure 15 Measuring points on electric mot...

Страница 16: ...VMID is 80 C 5 3 2 Mounting the VMID Measurement Point A VMID measurement point is mounted onto the machine using two component epoxy adhesive For an accurate vibration transmission Metra recommends t...

Страница 17: ...velocity 2 Hz 1kHz Vibration acceleration 0 2 Hz 10 kHz Vibration acceleration 3 Hz 1 kHz Vibration acceleration 1 kHz 10 kHz Vibration displacement 5 Hz 200 Hz K t value for rolling bearing monitorin...

Страница 18: ...er the edge To improve the vibration transmis sion the measuring point can be lightly lubricated As soon as the Sensor base comes into contact with the measurement point the VM25 displays the measurem...

Страница 19: ...t settings Note Changing the measuring point data also effects the display of saved measur ands cf Chapters 6 5 and 6 6 The current saved text of the respective VMID serial number is always displayed...

Страница 20: ...s Note Deleting measurement point data effects the display of saved measurements chapter 6 6 Instead of the measurement point serial number and the measurement point text being shown none is displayed...

Страница 21: ...measurand At each data point the date and time of the measurement as well as the measured RMS or K t value are displayed Above the diagram the text assigned to the measurement point is displayed In o...

Страница 22: ...Measurement The basics of rolling bearing parameters K t can be found in section 3 5 First use keys to select the operation mode Roll bearing Figure 26 K t measurements are only intended for use in co...

Страница 23: ...s to the K t display It then reads the start values from the mem ory and calculates the K t value from the currently measured RMS t and Peak t values Figure 29 Press the key to save the K t values Pre...

Страница 24: ...igure 30 In the sub menu View K t base memory you can scroll through the saved start values using the keys Press F1 to delete an entry In the sub menu Erase K t memory all saved K t start values can b...

Страница 25: ...he peak value with linear scaling and the horizontal axis the frequency The diagram shows 125 lines The frequency range in display can be halved by pressing F1 and doubled by pressing F2 The following...

Страница 26: ...l view 6 9 2 FFT Memory To view stored FFTs in the instrument open the main menu select Meas data memory and View FFT data memory The FFT data can be viewed in order of the VMID serial number or the d...

Страница 27: ...king rotation speed measurements the rotating part needs to be marked with a piece of reflective film Self adhesive reflective film can be purchased from Sick www sick com for example the material REF...

Страница 28: ...on which the sensor is placed 6 11 Temperature Measurement The temperature measurement is carried out together with the rotational speed mea surement Figure 35 The VM25 contains an infrared temperatur...

Страница 29: ...ed continuous operation C Poor condition allows restricted continued operation only D Critical condition Danger of damage to the machine v eff 10 1000 Hz 45 mm s 28 mm s 18 mm s 14 7 mm s Zone C D 4 5...

Страница 30: ...height above 315 mm Electric motors with a shaft height between 160 and 315 mm Foundation flexible rigid flexible rigid v eff 10 1000 Hz 11 mm s D D D D 7 1 mm s C D D D 4 5 mm s B C C D 3 5 mm s B B...

Страница 31: ...Risk of damage to the machine C Restricted operation B Lasting operation in safe working operating range without restrictions possible A Newly commissioned pumps in preferred operating range Table 3 C...

Страница 32: ...upplied vibration transducer The serial number of the instru ment and the transducer are stated on the calibration certificate The month and year of the factory calibration are displayed when the inst...

Страница 33: ...ested to mount the sensor on to the vibration exciter Figure 40 This is done using the magnetic base Press OK The VM25 is now ready for the reference vibration signal It displays the measured accelera...

Страница 34: ...ects three operational conditions 0 1 V short circuit 0 1 11 V in working order 11 V open input e g broken cable If a short circuit occurs or the input is open the instrument will display SENSOR ERROR...

Страница 35: ...ess the re set key to restart the instrument The reset key is reached with a thin object through the aperture next to the type label Figure 45 Saved data and settings are not lost when the instrument...

Страница 36: ...is directory should be entered The device driver is digitally signed and runs with Windows XP Vista 7 8 and 10 13 2 VM2x Measurement Database As an option Metra provides the PC program VM2x Measuremen...

Страница 37: ...a to a PC A tool for exporting the stored FFT data can be found at http www mmf de software_download htm vm2x The macro file can be opened with the spreadsheet software Microsoft Excel It transfers th...

Страница 38: ...load htm Here you will see the most recent firmware version available The version number is composed of three digits for the hardware and three for the software hhh sss Only the last three digits are...

Страница 39: ...ument Settings select the option Update Firmware and confirm the warning and subsequent hint messages by pressing OK By car rying out this step the old firmware is deleted The VM25 will then indicate...

Страница 40: ...1 kHz 10 kHz Velocity 10 1000 Hz Velocity 2 Hz 1000 Hz Displacement 5 Hz 200 Hz 3rd order Butterworth filter Overload indication at 200 m s vibration acceleration on the sensor or 1000 mm s or 60 mm a...

Страница 41: ...atteries without sensor Vibration Transducer Type KS82L Measuring principle Piezo electric shear accelerometer Output Low power IEPE Sensitivity 3 5 mV ms 2 common Operating temperature range 20 80 C...

Страница 42: ...y under this warranty does not apply to any improper or inadequate maintenance or modification and operation outside the product s specifications Shipment to Metra will be paid by the customer The rep...

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