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Vibration Analyzer

Data collector

DC-23

User Manual

Vibration Analyzer + Data Collector DC-23 User manual

Vibration Analyzer and Data Collector DC-23 is a portable battery powered dual channel device used for condition monitoring purposes. It allows simultaneous measurements of a number of parameters like vibration, rotation speed, etc.

Contents

Uses ................................................................................................................................................. 5

1. Kit ............................................................................................................................................ 6

2. Specifications .......................................................................................................................... 7

3. Description .............................................................................................................................. 8

3.1. Front panel and controls .................................................................................................. 8

3.1.1. Description of the buttons ......................................................................................... 8

3.2. Connection sockets .......................................................................................................... 9

3.3. Switching on the DC-23 ................................................................................................ 10

3.4. Switching off the DC-23 ............................................................................................... 11

3.5. Emergency shutdown .................................................................................................... 11

4. Operation ............................................................................................................................... 12

4.1. General directions and safety precautions ..................................................................... 12

4.2. Transducers .................................................................................................................... 12

4.3. Connection to the PC ..................................................................................................... 12

4.4. User interface ................................................................................................................. 12

4.5. Getting started ............................................................................................................... 14

4.5.1. The DC-23 setup ...................................................................................................... 14

4.5.1.1. Inputs setup ...................................................................................................... 15

4.5.1.2. Test measurements setup .................................................................................. 18

4.5.1.3. Date and Time setup ......................................................................................... 19

4.5.1.4. Settings ............................................................................................................. 20

4.5.1.5. Measurement Settings ...................................................................................... 21

5. Data collector mode. Route maps. ......................................................................................... 22

5.1. Route maps .................................................................................................................... 22

5.2. Data collection ............................................................................................................... 22

5.3. Review Data .................................................................................................................. 26

6. Analyzer mode. ...................................................................................................................... 30

6.1. Analyzer......................................................................................................................... 30

6.2. Measurements ................................................................................................................ 30

6.3. Review measured data ................................................................................................... 32

7. Applications ........................................................................................................................... 37

7.1. Tachometer .................................................................................................................... 37

7.2. Balancing ....................................................................................................................... 37

7.2.1. Machine configuration ............................................................................................ 38

7.2.2. Balancing configuration .......................................................................................... 41

7.2.3. Initial vibration measurement ................................................................................. 41

7.2.4. Trial weight installation and trial runs ................................................................... 44

7.2.5. Correction weight calculation ................................................................................. 45

7.2.6. Next trial weight installation and trial runs ............................................................ 45

7.2.7. Next correction weight calculation ......................................................................... 46

7.2.8. Correction weight installation and final measurements ......................................... 47

7.2.9. Balancing report ...................................................................................................... 49

7.3. Run-up \ Coast down ..................................................................................................... 50

7.4. Shock ............................................................................................................................. 52

8. Data exchange........................................................................................................................ 55

Vibration Analyzer + Data Collector DC-23 User manual

Uses

DC-23 vibration analyzer is a portable dual-channel battery-operated vibration analyzer and data collector. The functions of this unit include vibration data processing, spectrum analysis and recording (storage). Additional machine commissioning functions include balancing, shock pulse analysis, run-up\coast-down analysis.

The DC-23 records measurement data for further condition monitoring diagnostics and condition forecast of rotating machines based on vibration parameters.

The DC-23 is operated with IEPE type piezoelectric vibration transducers (accelerometers) connected to A and B input sockets of the unit. Additionally it can be used with a tacho (FD-2 type) for measuring rotation speed and phase of the monitored machines. Use the "Tacho" input socket for tacho connection.

The key functions of the DC-23 include:

o Data collection according to the route map loaded from the external PC; o Vibration analyzer; o Machine balancing;

The DC-23 is designed to perform the following measurements:

o autospectra; o envelope spectra; o overall vibration level in the specified frequency band with measurement of the following

values:

 root mean square (RMS);  peak (PEAK);  peak-to-peak (Peak-Peak);  peak factor (PEAK factor);  peak equivalent (1,414×RMS);  peak-to-peak range equivalent (2,82×PTP);  kurtosis

o rotor rotation speed. o amplitude and phase on the rotation speed and its harmonics o time waveform signal o constant percentage wideband spectra (1/1, 1/3, 1/6, 1/12 octave spectra) o cross spectra o orbits of the shaft rotation (using proximeters (not included in the DC-23 set) o amplitude-phase-rotation speed during machine run-in and coast-down o shock spectrum analysis o balancing in own supports (up to 4 balancing planes, 5 measurement points, 3 directions)

Vibration Analyzer + Data Collector DC-23 User manual

Item №

Description

Quantity

Notes

DC-23 vibration analyzer (basic unit)

1 2

DM-2 magnetic holder

2 3 603V01 vibration transducer

Interface cable RC76-21-1a (yellow)

1 1.5 meters

Interface cable RC76-21-1а (green)

1 1.5 meters

Interface cable RC76-21-5a (yellow)

1 5 meters

Interface cable RC76-21-5а (green)

1 5 meters 8

FD-2 tacho

Interface cable KMM-21-1

1 1.5 meters

Interface cable KMM-21-10

1 10 meters 11

SMD-2 holder

SA-23 charger

Ethernet Interface cable

Ethernet to USB adapter

DC-23 protective case

DC-23 system report

Large kit case

USB memory stick

headset for DC-23 unit

1. Kit

DC-22 vibration analyzer kit content is listed in table 1 below.

Table 1. Standard configuration.

Vibration Analyzer + Data Collector DC-23 User manual

Number of channels

- Vibration

- Tacho

2 1

Voltage range on linear input

-5V \ +5V

Vibratory acceleration measurement range (RMS), m/s2:

 for 1,02 mV/(m∙s-2) rated sensitivity;  for 3,06 mV/(m∙s-2) rated sensitivity;  for 10,2 mV/(m∙s-2) rated sensitivity;

from 0,1 through 3400 from 0,1 through 1100

from 0,1 through 340

Vibratory velocity range (RMS), mm/s:

 for 1,02 mV/(m∙s-2) rated sensitivity;  for 3,06 mV/(m∙s-2) rated sensitivity;  for 10,2 mV/(m∙s-2) rated sensitivity;

from 0,1 through 6900 from 0,1 through 2300

from 0,1 through 690

Vibratory displacement range (RMS), µm:

 for 1,02 mV/(m∙s-2) rated sensitivity;  for 3,06 mV/(m∙s-2) rated sensitivity;  for 10,2 mV/(m∙s-2) rated sensitivity;

from 0,5 through 54900 from 0,1 through 18000

from 0,1 through 5400

Rotation speed, rpm

from 120 through 60000

Frequency range, Hz:

 for vibratory acceleration, velocity and displacement RMS measurement;  in spectral analysis.

from 2 through 1000 from 10 through 1000 from 10 through 2000

from 1 through 51200

Full scale frequencies of spectral analysis subranges, Hz:

25, 50, 100, 200, 400, 800,

1600, 3200, 6400, 12800,

25600, 51200

Basic relative error range for vibratory acceleration, velocity and displacement control at basic frequency, %

± 3

Number of spectral lines

400 - 51200

GOST 17168-82 class 3 1/3 octave band filter medium frequencies in envelope mode, Hz

1000, 1250, 1600, 2000, 2500, 3200, 4000, 5000,

6400, 12800, 20000

1/1 octave filter medium frequencies, Hz

50, 100, 200, 400, 800,

1600, 3200, 6400, 8000,

12800, 16000

Band filter frequency response for vibratory acceleration, velocity and displacement RMS measurement

under GOST ISO 2954-97

Spectral analysis dynamic range, dB, min.

100, not less

Channel interference, dB, max.

-100

Operating conditions: ambient temperature range, ºС

relative air humidity range, %

from -20 through +50

from 30 through 90

Size (length × width × depth), mm

194×143×39

Maximum weight, kg

1,05

Environmental protection

IP65

2. Specifications

Vibration Analyzer + Data Collector DC-23 User manual

Use the «POWER» button to switc on/off the DC-23. To turn on the unit, press and hold this button for 1-2 seconds, then release the button. Follow the same procedure to switch off the unit. During switch-off a dialog box will pop up on the display for switch-off confirmation.

Use the «LIGHT» button to toggle the backlight intensity. To increase the backlight brightness to maximum continue pressing briefly on this button. Once the backlight level has reached maximum, each further pressing will dim the display.

3. Description

3.1. Front panel and controls

To operate the unit use the keyboard located on the front panel. The functions of the buttons are indicated by symbols and lettering.

3.1.1. Description of the buttons

Vibration Analyzer + Data Collector DC-23 User manual

Use the «HELP» button for access to context-sensitive help. Software versions below 1.1 do not support processing press operations with this button.

The ◄►▲▼ cursor buttons are used for navigation in menu

windows, moving the cursor etc. For detailed description of the buttons and cursor operation, please, refer to the respective sections of this manual.

The «ENTER» button is used to confirm the selected operation set in the input field or to proceed to the next operation. For detailed description of the "ENTER" button please refer to the respective sections of this manual.

The «CANCEL» button is used to cancel the current operation and

returning to the previous menu.

The alphanumeric buttons are used for entering the respective characters. At certain steps these buttons are used as function keys. Button function prompt is displayed in the prompt bar.

3.2. Connection sockets

All sockets for plugging the sensors, headphoes and PC to the analyzer are located under the top cover panel of the unit (see Fig. 4.2.1).

Figure 4.2.1. Connection sockets.

Vibration Analyzer + Data Collector DC-23 User manual

This socket is used for connecting the FD-2 tacho probe for rotational speed and phase measurement.

A and B sockets are used for connecting IEPE type vibration sensors.

This socket is used for headphones connection.

The power adapter and PC connection socket is located in the bottom cover panel of the unit

3.3. Switching on the DC-23

To switch the unit on, press the "POWER" button on the front panel. The start up window will be displayed. The start up process may take about 1 minute. After the startup the main menu will be displayed.

Vibration Analyzer + Data Collector DC-23 User manual

3.4. Switching off the DC-23

To power off the DC-23, press the "POWER" button, hold it for a few seconds and release. Use the ▲and ▼ cursor buttons, in the pop up window, select "Yes" to switch off or "No" to continue operation and press "ENTER".

You can also use the "CANCEL" button to continue operation of the DC-23.

3.5. Emergency shutdown

In the unlikely event thet the DC-23 will hang up with no response to keyboard, the DC-23 can be shut down in the emergency way. To shut down the unit, press and hold the "POWER" button for 15-20 seconds.

Vibration Analyzer + Data Collector DC-23 User manual

4. Operation

4.1. General directions and safety precautions

Before starting to operate the unit, please read carefully this user manual, all relevant safety rules applicable to the monitored equipment and industrial safety procedures.

4.2. Transducers

The DC-23 kit includes two IEPE (ICP) type vibration transducers (accelerometers) and FD-2 tacho probe transducer. The transducers are connected to the corresponding connectors on the top panel of the DC-23

Note: the connectors keys are different for the accelerometer and tacho connectors.

4.3. Connection to the PC

The DC-23 uses the Ethernet port to connect to the PC. The connector is located on the bottom panel of the DC-23. If your PC does not possess free Ethernet port, you can use the Ethernet to USB adapter from the DC-23 kit

The USB port on the top panel of the DC-23 is used to connect the external devices like switch box, memory stick, ets. But is not interned for PC connection,

4.4. User interface

User interface design is based on windows hierarchy. The main menu window constitutes the top tier of this hierarchy and contains icons for selecting the required operations and proceeding to the related interface window.

Vibration Analyzer + Data Collector DC-23 User manual

Here you can use the cursor buttons to select an icon and enter the next level of the menu or execute the command.

The main menu window consists of the following components:

 "Routes" - use this icon to select the route map for measurements, and proceed to the data

collector mode of the DC-23 operation;

 "Analyzer" - use this icon to select the Analyzer mode of the DC-23 operation. It allows

instant configuration of measurements;

 "Data exchange" - use this icon to connect to a PC for uploading/downloading route maps

and the measurement results;

 "Settup" - use this icon to setup the DC-23 modes, sensors, date and time parameters,

etc.;

 "About" - use this icon to access information about the DC-23, version number, etc.  "Application" - use this icon to access the applications menu – balancing, run-in\coast-

down, etc,

All interface window elements include:

o a window header located in the top part of the window and containing the following

information:

 Topic description for current user location in the interface window hierarchy;  Sensors state  Current date and time;  Battery charge level.

The shortcut help bar (prompt bar) is located in the bottom part of the window.

For navigation in the main menu window use the ◄►▼▲.cursor control keys. To confirm the choice, press the "ENTER" button.

To leave the menu to the upper hierarchy level use the cancel button.

Vibration Analyzer + Data Collector DC-23 User manual

4.5. Getting started

4.5.1. The DC-23 setup

To use the DC-23 Vibration Analyzer an data collector you should set up the instrument first. To do this use the Setup menu of the DC-23

Your will see the following options

Here you can setup the DC-23

Vibration Analyzer + Data Collector DC-23 User manual

4.5.1.1. Inputs setup

Input configuration includes description of what is connected to the input connector of the DC23 as a sensor.

Select the Inputs menu from the setup menu and press Enter button.

Here you will see a list of configured inputs (you can select them by cursor keys) and you can use the following buttons on the DC-23 to:

1 Set the selected input for channel A 2 Set the selected input for channel B 3 Setup a new input 4 Edit the selected input 5 Delete the selected input

Note – the DefaultA and DefaultB inputs can not be edited or deleted. These are the “system files” required for the DC-23 operation while no user inputs have been configured.

Before conducting any measurements you have to setup your inputs and enter the parameters of the sensors you are going to use.

To do this use the “3” – create button on the keyboard and enter the password

Vibration Analyzer + Data Collector DC-23 User manual

By default the “11111” password is used to change the inputs of the DC-23

The following and the following dialog is used to configure inputs

Here: Name Enter the name of the input. To do this select the Name field and press Enter

button – you will be in the editing mode. You can enter the name using alphanumeric keypad as on the old phones – press a button several times to enter the desired letter or number. Use right and left cursor keys to move the cursor, down cursor key – as backspace. After you entered the name, press Enter to confirm it.

Sensitivity Enter the sensitivity of the sensor from its calibration certificate and press

Enter to confirm it. Input units Can be only milliVolts Output units Use left and right cursor keys to select the magnitude and units that measures

the sensor. For accelerometer it should be Gs, for linear input – Volts, for

proximity probe – um, for current clamps Amperes, etc.

Vibration Analyzer + Data Collector DC-23 User manual

IEPE Select if the DC-23 should power the sensor (IEPE or ICP). Select by left and

right cursor keys YES to power sensor and NO not to power it. Coupling Select AC or AC coupling of the input. Note with the ICP power ON you can

use only AC coupling.

After you entered all parameters use the “Cancel” button to exit configuration. A dialog box will

be displayed that will allow you to confirm changes to inputs or discard them.

For example use the following configuration for the IEPE accelerometer:

The actual sensitivity of the accelerometer # 3350 is entered.

Here is an example of the linear input configuration with DC coupling^

The sensitivity is 1000 mV/V.

Vibration Analyzer + Data Collector DC-23 User manual

Once you have configured all the required inputs you can select what sensors are connected to the DC-23. To do this selec1 the input and use button “1” to select it for channel A and button “2” to assign it to channel B.

The assigned inputs will be highlighted with the color (yellow or green).

4.5.1.2. Test measurements setup

In the data collector mode of the DC-23 operation, you can conduct the test measurements before collecting data in a Route. These measurements are used to ensure the proper installation of the accelerometers or other sensors. To configure the test measurements use the corresponding icon in the Setup menu

The following dialog will be displayed:

Vibration Analyzer + Data Collector DC-23 User manual

Use up and down cursor keys to select parameters and left –right cursor keys to select the value.

You can setup one autospectrum and one envelope spectrum for each channel plus display or not the rotation speed from the tacho.

Here Fmax Full scale frequency for the spectra; Resolution Number of lines in the spectra; Filter Center frequency of the filter in the envelope detector, it can be 1/3 or 1/1

octave width; Detector type RMS, Peak or Peak factor for the overall level.

Once the configuration is done – press the “Cancel” button to save or discard changes after confirmation.

4.5.1.3. Date and Time setup

All the measurements in the DC-23 is stamped with date and time. The date and time of measurements can be used for trending vibration data in the software, so it is important that you keep correct time in the DC-23 before collecting data

To setup date and time use the corresponding icon from the Setup menu

Vibration Analyzer + Data Collector DC-23 User manual

Use up\down cursor keys to select the field and left\right cursor keys of alphanumeric keys to enter the values.

Once the configuration is done – press the “Cancel” button to save or discard changes after confirmation.

4.5.1.4. Settings

In the Settings section of the DC-23 Setup you can adapt DC-23 for your requirements:

Use up and down cursor keys to select the line and right and left cursor keys to select the option value. Here:

Automatic shutdown select off so that the instrument will not shut down automatically when

not used or select the number of minutes after which in idle mode the instrument will switch off.

Sort routes thw way to sort route maps in the list

Vibration Analyzer + Data Collector DC-23 User manual

Language select the interface language Results storage limit The DC-23 can store many measurements for each measurement point.

Here you can set the limit.

Waring for no linked points In two channels measurement like cross spectra the DC-23 needs

two channels to be selected for measurement. If only one channel is selected it may present a warning.

Reset battery calibration To get accurate indication of the battery it is recommended to

recalibrate the battery capacity from time to time. This command allows you to do this.

Rotation frequency control Allows monitoring and record of the rotation speed during

measurements. Tacho probe is required for this option,

Set all the required options and press Cancel button to exit this dialog. On exit you will be asked to save or discard changes to the settings.

4.5.1.5. Measurement Settings

In the Measurement Settings section of the DC-23 Setup you can set the measurement modes of the DC-23:

Use up and down cursor keys to select the line and right and left cursor keys to select the option value. Here:

Phase correction use alphanumeric keys to enter he constant number that will be added to

the phase result for each measurement. The phase measurement is not standard for all types of instruments in the market and it is changed dependent on the magnitude your measure (displacement, velocity, acceleration differs in phase by 90 degrees), so you can adjust the phase reading if needed.

Phase Phase reading direction. You can measure phase with rotation or against

rotation.

Control measurement This is a test measurement in data collector mode of the DC-23. After

sensors placement you can make test measurement to assure correct installation of the transducers before recording data. If you are sure about the correct installation you can skip this procedure.

Vibration Analyzer + Data Collector DC-23 User manual

Channels assignment Before measurement in the data collector mode according to the route

you have to assign channels and measurement points. The DC-23 can assign them automatically or you will need to do it manually. In any case the initial assignment can be revised manually.

Set all the required options and press Cancel button to exit this dialog. On exit you will be asked to save or discard changes to the settings.

5. Data collector mode. Route maps.

5.1. Route maps

The DC-23 Vibration Analyzer and data collector main operation is data collection according to the preloaded route map. The route map is a set of measurement points with the configured measurement setups, alarm levels, etc. Tach measurement point can have a great number of different measurement setups and all of them will be measured simultaneously during measurement process in the data collection mode. The route maps are configured in the external software, for example “DREAM” software and loaded to the DC-23 before going to the field measurements.

The process of route’s setup is described in the user manuals for the external software.

The route contains the names of the measurement points and their location in the database, so all the measurements collected according to the route will be unloaded to proper database locations for trending, condition diagnostics, etc.

5.2. Data collection

To enter the data collector mode of the DC-23 use the Routes icon in the main menu, it will bring you to the Routes dialog, where you can select a route:

Vibration Analyzer + Data Collector DC-23 User manual

Here on the left panel you can select the route using cursor keys and Enter to confirm the choice. On the right panel is the information about the selected route

The route window presents the hierarchy tree for the measurement points:

Use up and down cursor keys to select the level and left\right cursor keys to open and collapse levels.

Here you have to select measurement points and assign the channels. The DC-23 has two channels and the measurements ae done simultaneously on both channels that speeds up the measurement process.

Is you selected automatic points assignment in the DC-23 setup, then the first two unmeasured points will be assigned A and B channels – you can see colored A and B marks next to the first points.

To assign measurement points manually select the measurement point and press “1” button for

the A channel and “2” button for the B channel. For example is you have a drying section of the

paper machine or a gearbox it is reasonable to measure two bearings from one side at a time and then two bearings on the other side, but not two bearings from one axis like:

Vibration Analyzer + Data Collector DC-23 User manual

To start measurements on the selected measurement points with assigned channels press Enter button.

The test measurement screen will be displayed is you have chosen it in the DC-23 setup:

Here you can see auto- and envelope spectra from both channels. The color shows the channel green color is for channel A, yellow is for channel B. ES letters on the spectrum panel upper right corner is for envelope spectrum, AS is for autospectrum. On the right is the pink panel with the rotation speed monitoring window and the current RPM value. It is essential that you collect data on stable rotation speed.

The setup of the test spectra is done in the setup of the DC-23 instrument.

The following keys can be used to control the test measurements process:

Enter Start data collection 1, 2 toggle channels in the spectrum panels Right\left toggle auto- and envelope spectra on the spectrum panels Up\down toggle full screen\tile mode of spectrum panel 4 display overall level 8 toggle channels in the earphones for audio monitoring of the signal (the

earphones should be connected during measurements. 6\7 adjust volume in the earphones 9 pause\continue measurements and freeze the display Cancel stop measurements, do not record data, return to select measurement points

dialog in the route.

While looking at the spectra pay attention to the channel state indicator (green A and B on the top line in the DC-23 display), vibration level, shape of the spectra (rise of the background level of the envelope spectrum in the low frequency domain like in the yellow channel on the figure above reveals poor installation of the accelerometer), stability of the rotation speed, etc. Below is a symptom for unstable rotation speed:

Vibration Analyzer + Data Collector DC-23 User manual

During the test process the current measuring channel status indicators will be displayed in the Check window header bar. The indicators used in DC-23 unit are listed below: (+) the channel is OK; (SC) channel failure (short circuit); (- -) channel failure (open circuit); (!-!) low voltage; (!+!) high voltage; [!] channel overload; [ ] out-of-band interference.

Once you press Enter button the data collection process starts. The DC-23 will display information on the time required for data collection and starts the measurement. It collects raw data from both channels required to calculate all the measurements.

After data collection is finished the DC-23 displays the following screen

Vibration Analyzer + Data Collector DC-23 User manual

The processing takes another few seconds depending on what measurements are configured. When this screen is displayed you can dismount sensors.

Once all the processing is finished the data are saved and you return back to the route display:

The M letters are added to the points where the measurements are done and saved.

The color of the symbol is defined by the alarm levels set in the route and indicates the vibration condition in the respective measurement point. The alarms are set during route map configuration in DREAM and corresponds to the following ranges:

 Red – danger alarm;  Yellow – alert alarm;  Green - within the operating range;  Blue - invalid value; value beyond the measurement range; measuring channel

failure.

 Gray - no threshold values available.

5.3. Review Data

To enter the data collector mode of the DC-23 use the Routes icon in the main menu, it will bring you to the Routes dialog, where you can select a route:

With the measured points, you can review the data. Use “5” button to do this.

Vibration Analyzer + Data Collector DC-23 User manual

The last measured spectrum will be displayed. As one measurement set in the route map may contain different spectra and other measurements on the left you will see the list of measurements in the measurement point. Use left\right cursor keys to scroll through the measurement types. Above is envelope spectrum, below is autospectrum:

Any measurement point can contain several measurement results stamped with different date\time of measurement. To review the previous measurements use the “1” button. The list of measurements by date will be displayed:

Vibration Analyzer + Data Collector DC-23 User manual

Use up\down cursor keys to select the date\time and Enter to display the measurement results. The up and down keys can be used to change measurement type.

Once you selected the spectrum it will be displayed full screen. Use Enter button to display the cursor:

Here use the following keys:

6\7 to zoom\unzoom the frequency axis 4\9 to zoom\unzoom amplitude axis Left, 3,8 to move cursor left with different speed Right, 5, 0 to move cursor right with different speed Up to position cursor on the nearby peak. Also in this mode the amplitude and frequency

of the peak readings will be adjusted to the true values.

Vibration Analyzer + Data Collector DC-23 User manual

Above is the spectrum measured with 1 Hz frequency resolution and the cursor readings with the

“up” key used shows the 49.69 Hz actual frequency for the rotation speed of the induction motor

though the nearby channels are 49 and 50 Hz.

To leave the review mode use “Cancel” button.

Vibration Analyzer + Data Collector DC-23 User manual

6. Analyzer mode.

6.1. Analyzer

The Analyzer mode of the DC-23 Vibration Analyzer and data collector allows configuration of the measurements in field. In this mode you can conduct and save any measurements without preloading route maps. Usually this mode is used for field diagnostics.

To enter Analyzer mode use the Offroute icon in the main menu of the DC-23. The following analyzer menu will be displayed:

Here you can select the channels for measurements – use “1” button to toggle channels selection.

6.2. Measurements

Use the icon correspondent to the measurement type required. The measurement setup dialog will be displayed. Here is an example for envelope spectrum setup:

Vibration Analyzer + Data Collector DC-23 User manual

Here use the up\down cursor keys to select the parameter and left\right keys to choose the parameter value. Note that selecting logarithmic scale you will get readings in dB, while selecting linear you will get readings in selected units. To measure acceleration, velocity or displacement use corresponding units.

Set all the parameters and press Enter to start measurement.

In the line above spectrum you will see the averages completed and averages set.

By “1” button you can toggle channels during measurements, key “3” toggles channels output

for the earphones.

After measurement is complete you can use cursor in the same way as in the data collector mode, toggle channels with “1” button.

The following keys are used for analysis:

6\7 to zoom\unzoom the frequency axis

Vibration Analyzer + Data Collector DC-23 User manual

4\9 to zoom\unzoom amplitude axis Left, 3,8 to move cursor left with different speed Right, 5, 0 to move cursor right with different speed Up to position cursor on the nearby peak. Also in this mode the amplitude and frequency

of the peak readings will be adjusted to the true values.

To exit analyzer mode press Cancel and confirm whether to save or discard measured data:

6.3. Review measured data

To review the data measured in the analyzer mode use the “2” button in the analyzer menu:

Select the measurement and press Enter to review and analyze it or “2’ button to delete it.

You will get the same analysis instruments as in the measurement mode.

Vibration Analyzer + Data Collector DC-23 User manual

The following measurements can be analyzed: AS Autospectrum ES Envelope spectrum OL Overall level (vibration level, etc. scalar measurements) AP Amplitude-phase TW Time waveform (time domain signal) CPB Constant percentage bandwidth MS Cross spectrum

Below is the examples of data for some types of measurements:

Autospectrum and Envelope spectrum:

Time signal:

Constant percentage bandwidth spectrum (1/12 octave bandwidth):

Overall level:

Vibration Analyzer + Data Collector DC-23 User manual

Amplitude and phase:

Cross spectrum:

Vibration Analyzer + Data Collector DC-23 User manual

In the cross spectrum you the correlation spectrum (amplitude and phase) for two channels. In addition to cursor movement and zoom you can you the following buttons on the DC-23^ “.” to toggle phase display -180 \ +180 and 0 \ 360 degrees 2 display autospectra from both channels

The autospectra display presents:

Vibration Analyzer + Data Collector DC-23 User manual

Here the red spectrum is correlation between channels and on the cross-spectrum display, Green and Yellow – autospectra from channels A and B.

Vibration Analyzer + Data Collector DC-23 User manual

7. Applications

7.1. Tachometer

Tachometer application is used for the tacho signal monitoring for the proper installation of the tacho probe and rotation speed measurement. The tacho probe used with DC series vibration analyzers is TTL type and it provides signal of rectangle form one pulse per revolution. The tachometer application shows you the tacho signal and you can adjust the tacho position so that you get the one per revolution even pulses.

You can use “6” and “7” buttons to adjust the scale and “Cancel” button to exit the application.

7.2. Balancing

The DC-23 analyzer can be used for rotor balancing in its own supports. The balancing can be done for:

- Up to 4 balancing planes (weights attachment planes)

- Up to 5 measurement points

- Up to 3 directions of measurements in each measurement point

Note that the number of balancing planes is in not dependent on the number of measurement points. It depends only on machine design.

Balancing plane is a plane on the rotor where you can attach balancing weights. Measuement point is a place on the machine case where you can attach

accelerometers for vibration measurements.

Direction of measurements you can make measurements is horizontal, vertical and axial

directions. The reason for it is that the machine rigidity can be different in different directions thus the resonances, vibration distribution can vary with the directions. We recommend to measure vibration in direction of highest and lowest rigidity of the machine – for horizontal machine it will be vertical and horizontal directions. The axial vibration usually cannot be removed with balancing, but in many cases it is recommended to monitor it and verify that is it not increased following the weight attachments. Usually axial vibration reflects the coupling condition in the machine

Balancing is a method of machine commissioning that removes the machine vibration on the rotation speed of the machine only. So before balancing it is recommended to make measurements of the vibration autospectrum. The balancing is recommended when the highest peak in the autospectrum is rotation frequency. If it is not like this, you should do condition diagnostics first and repair the machine, and balancing will not result in the overall vibration level decrease. For example if the second harmonic of the rotation speed in higher than the first one – it is a symptom for some kind of misalignment, if the 100Hz (120 Hz) harmonic is the highest - it is a symptom for electrical defect, etc.

The balancing procedure consists of the following steps:

Vibration Analyzer + Data Collector DC-23 User manual

1. Investigate the machine and find the balancing and measurement planes a. For balancing you have to define initially all the measurement points – usually on

all the bearing shields and we recommend to use two directions. You can use additional measurement points on basement, operator place or anywhere else of you need to decrease vibration there.

b. You should define the balancing planes – the places where you can install

correction weights. And you can classify the balancing planes by easy access and importance. Not all balancing planes may be needed to decrease the vibration, so start with the most easy accessible and most important according to your experience.

c. Make initial vibration measurements of autospectra and verify that the rotation

speed components are essential. Remember – by balancing you can remove only this vibration component from the overall vibration of the machine.

2. Install tacho probe on the machine. Once tacho is installed you should not remove it and

change its position till the end of balancing. More, you should save its position and the position of mark on the shaft. In this case you can use the influence coefficients and do the future balancing of this machine without trial runs.

3. Make initial vibration measurements of the amplitude and phase on the rotation speed in

all measurement points and directions.

4. Choose one balancing plane, install there a trial weight. a. Make trial measurement for the first plane – amplitude and phase on the rotation

speed in all measurement points.

b. The program will calculate the correction weight to be installed in this plane and

the balancing efficiency by this plane (vibration levels that could be achieved after installation of the calculated correction weights in this plane).

5. Analyze the results. If the targeted vibration levels are enough for you, you can install the

correction weights and finish balancing. If the proposed decrease of vibration is not enough then continue

a. Choose one mere balancing plane, install there a trial weight. b. Make trial measurement for this plane – amplitude and phase on the rotation speed

in all measurement points and directions.

c. The program will calculate the correction weight to be installed in all used planes

and the balancing efficiency by these planes (vibration levels that could be achieved after installation of the calculated correction weights in the planes).

d. Analyze the results. If the targeted vibration levels are enough for you, you can

install the correction weights and finish balancing. If the proposed decrease of vibration is not enough then continue

e. You can add up to 4 balancing planes in this way

6. Once you decided that the balancing efficiency is achieved install all the correction

weights in all planes and make the final measurements in all measurement points.

7. The program will calculate the correction weights for all points and balancing efficiency

– you can decide to install them of finish balancing and make report.

7.2.1. Machine configuration

Balancing application of the DC-23 vibration analyzer operates with machines. When you start the balancing application for the first time you need to create a machine:

Vibration Analyzer + Data Collector DC-23 User manual

Use button “7” of the DC-23 keypad to create a new machine. (You can also edit or delete existing machines here)

The following dialog is used to create or edit a machine:

Here use the cursor keys to select the input box and use Enter to edit it. Machine name Use Enter for editing mode and alphanumeric buttons to enter the machine

name. Left cursor key is backspace, Right – is space. All other keys can be pressed several times to toggle letters and numbers. Press Enter to accept editing

Amount Use enter to open the list and select with Up and Down the number of planes,

points or directions. Press Enter to confirm choice.

Name Use Enter for editing mode and alphanumeric buttons to enter the planes,

points and directions names. Left cursor key is backspace, Right – is space. All other keys can be pressed several times to toggle letters and numbers. Press Enter to accept editing

Comment Use Enter for editing mode and alphanumeric buttons to enter the comment.

Left cursor key is backspace, Right – is space. All other keys can be pressed several times to toggle letters and numbers. Press Enter to accept editing

Vibration Analyzer + Data Collector DC-23 User manual

You can also add the machine scheme. Use the “5” button to do this:

You can combine a machine from several elements.

1. Select a first element of the machine with up and down keys

2. Use Right cursor key to select the name of the plane or point and press enter

3. Select the name from the dropdown list and press Enter

4. Use “5” button to add the element to the machine scheme

In this way you can construct the scheme element by element:

Vibration Analyzer + Data Collector DC-23 User manual

Press Enter to save the scheme and return to balancing. The machine scheme will be included in the report and can be displayed during balancing process.

7.2.2. Balancing configuration

Before start of balancing setup the measurements:

Here select with cursor and use Enter to open the dropdown list of choices for vibration amplitude units, detector type, shaft speed units, angle reading direction, choose the units and press Enter button to confirm the choice.

7.2.3. Initial vibration measurement

Install accelerometers and tacho probe. The accelerometers should be installed in the correct measurement points and directions.

Vibration Analyzer + Data Collector DC-23 User manual

Select with a cursor key the point and direction in the table and press “1” to assign it to the A channel of the DC-23 and “2” to assign it to the B channel.

Start the machine, verify that it reached the operating speed and press “9” to start measurements.

After the measurements are done the rotation speed, amplitude and phase will be recorded in the table.

You can select next measurement points and directions and fill the whole table.

You can also retrieve the machine scheme (use “5” key) to see the vibration and location of

points on the machine:

Vibration Analyzer + Data Collector DC-23 User manual

Here you see the vibration vectors for two directions in colors and the resulting vector in black.

Note, you can enter vibration parameters using the keyboard instead of measurements. It can be useful if you have a different measurement device. To do this select the input box, press Enter, type in the numbers from the keyboard and press Enter to confirm. You have to enter rotation speed, amplitude and phase.

When all the measurements are done, use the “0” button to continue.

Here you have to select the balancing type – if you have balanced this machine before and saved the influence coefficients then you can skip the trial weights installation. If you have not balanced this machine or the machine had major repair or reinstallation you have to do the full balancing cycle with trial weights.

So make a choice and press “0” to continue. If you select balancing with influence coefficients – skip the trial runs chapter.

Vibration Analyzer + Data Collector DC-23 User manual

7.2.4. Trial weight installation and trial runs

After initial vibration measurements are done stop the machine, select any balancing plane and install there trial weight.

Here enter the parameters of the trial weight – select the plane name, weight amount and installation angle.

Generally it is not possible to calculate the trial weight, but there are some recommendations to make a reasonable choice

1. Inspect the rotor and try to find already installed balancing weights. If you find them you

can take the trial weight of the same size.

2. You can use the “7” button to estimate the trial weight amount. You will need to enter the

weight, radius and rotation speed of the rotor and the trial weight will be calculated.

3. The angle to install the trial weight for the multiplane machine is not possible to predict

by measurements.

After installation of the trial weight select the measurement point and direction, assign channels by “1” and “2” keys and start the machine.

Be careful then starting machine after installation of any weights – it may produce excessive vibration and damage the machine in rare cases. If it happens like this, immediately stop the machine and change the trial weight.

Use “9” button to start measurements. You have to make measurements in all points and

directions.

After measurements analyze the measurement results – look at the Sensitivity column of the

table “+” sign means that the rotor is sensitive to the trial weight in this point and direction. If

there is no sensitivity – increase the trial weight amount. If still no sensitivity – consider some defects present in the rotor, for example bent shaft, or misalignment. Do condition diagnostics for the machine.

Press “0” button to continue.

Vibration Analyzer + Data Collector DC-23 User manual

7.2.5. Correction weight calculation

After vibration measurements are done with trial weight, the correction weights are calculated for the whole number of planes for which the trial runs have been done.

Here we see the recommended weights for the M1 plane and expected balancing efficiency – expected vibration levels in each point.

Here you have a choice – if the expected vibration is enough, you can finish balancing, install the correction weights, do final measurements and issue report – use “8” button to issue the report or “9” for final measurements.

If the estimated vibration is too high, you can add next balancing plane in calculations, install trial weight in the next plane and do measurements. Use “0” button to do this.

7.2.6. Next trial weight installation and trial runs

If you choose next balancing plane -select any other balancing plane and install there trial weight.

Vibration Analyzer + Data Collector DC-23 User manual

Here enter the parameters of the trial weight – select the plane name, weight amount and installation angle. Specify if you will remove it or not.

After installation of the trial weight select the measurement point and direction, assign channels by “1” and “2” keys and start the machine.

Use “9” button to start measurements. You have to make measurements in all points and

directions.

After the measurements are done use “0” button to calculate correction weights.

7.2.7. Next correction weight calculation

Vibration Analyzer + Data Collector DC-23 User manual

After vibration measurements are done with trial weight, the correction weights are calculated for the whole number of planes for which the trial runs have been done.

Here we see the recommended weights for the M1 and M2 plane and expected balancing efficiency – expected vibration levels in each point.

In such a way you can add more balancing planes by continuing “0” button.

Or you can install the calculated weights and finish balancing. Use “9” button

7.2.8. Correction weight installation and final measurements

Install the calculated weights on the rotor in the corresponding planes and enter the actual weights amounts and angles of installation. It is important to do this as the next correction weights will be calculated based on the entered data

Vibration Analyzer + Data Collector DC-23 User manual

To enter weights parameters select the input box, press enter, use alphanumeric keys to enter number and press enter to confirm.

Use “1” and “2” buttons to assign channels and make final measurements in all points and

directions

Press “0” next button to continue

The new correction weights are calculated along with the expected efficiency.

You can install them to reach new vibration levels (use “0” button) or finish balancing if the

current vibration levels are satisfactory (use “8” button)

Here you can also review the Dynamic Influence coefficients using the “7” button

Vibration Analyzer + Data Collector DC-23 User manual

7.2.9. Balancing report

After final vibration measurements are done use “8” finish button to issue the report and save all

data.

The report will be saved and can be downloaded to PC for archiving or can be used for future balancing using influence coefficients.

Vibration Analyzer + Data Collector DC-23 User manual

7.3. Run-up \ Coast down

Run-up \ Coast down application is used to measure amplitude-phase-rotation speed characteristics of the machine during run up or coast down. You will need accelerometers and tacho probe to do the measurements.

When you start the application, you setup the measurement:

Use cursor keys to select parameters and Enter key to start measurements,

After the measurements are started you can start you machine or shut it down. After measurement the following results will be displayed

Here you see the amplitude and phase of the rotation speed harmonic dependent on the rotation speed. On the left panel you can see the list of resonances

Vibration Analyzer + Data Collector DC-23 User manual

Use the following controls: 1 toggle channels 2 toggle harmonic number left, 5, 8 move cursor left with different speed right, 5, 0 move cursor right with different speed 4 analyze table of resonances 6 view in polar graph

Above is a polar diagram.

The results can be saved and downloaded to PC.

Vibration Analyzer + Data Collector DC-23 User manual

7.4. Shock

The shock application is used for the analysis of resonances using shock method. You install accelerometer and knock the object with a hammer or other device. The shock signal is recorded and analysed.

When you start the application, setup the measurements:

Use cursor keys to setup parameters. The Auto mode when ON will automatically find and calculate parameters for all resonances, but it may take significant amount of time, so it is recommended to turn it OFF.

Use Enter or Measure button to start measurements, Then the masurements started hit the object. The signal will be recorded and presented:

Vibration Analyzer + Data Collector DC-23 User manual

Here you can see the Spectrum of the spectral density. You can select by cursor any line corresponding to the resonance and press Enter. The characteristics of the resonance will be calculated and presented in the table

The Frequency of the resonance, Logarithmic decrement, Q-factor, Setting time.

Here you can also use “6” and “7” buttons to zoom spectrum. Button “2” allows you to scroll through the table of resonances and button “1” shows you the impact signal:

Vibration Analyzer + Data Collector DC-23 User manual

You can zoom it and use cursor for the analysis:

The results can be saved and unloaded to the PC.

Vibration Analyzer + Data Collector DC-23 User manual

8. Data exchange.

You can load and unload data between the DC-23 and the external software, for example DREAM on the PC. To do this you should connect the DC-23 to the PC with the Ethernet connector at the bottom panel of the DC-23 and use Data exchange icon from the main menu.

Enter the password for connection the default password is ”00000”

Once the connection is established the “connection established” message will be displayed and

the control will be transferred to the PC

To leave data communication mode use Cancel button.

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