Microlog GX do 2 kenh bump test

Two Channel Measurement Overviewmeasurements may be triggered or non triggered channel measurements, one of the two channel inputs must be input Y CH2 displays in the Microlog’s Rev

2 Channel / Balancing / Bump Test / and Recorder Measurement Overview

Two Channel

Measurements

Two Channel Measurement Overview

measurements may be

triggered or non triggered

channel measurements,

one of the two channel

inputs must be input Y

(CH2)

displays in the Microlog’s

Review mode

Orbit Time X vs time Y, unfiltered or order-

filtered (up to 8 orders), plus DC gap measurement

Dual Spectrum

Spectra of both input channels captured and displayed simultaneously

Dual-Time Time waveforms of both input channels

captured and displayed simultaneously

Cross- Channel Phase

Phase of input X relative to input Y: Both spectra are stored and phase is displayed as a table of

magnitude/phase pairs with up to 8 orders

2 Ch Meas Accessed from Non ROUTE Mode

Orbit Measurement Overview

• An “orbit” measures the path of a shaft

centerline motion during rotation

• Machines such as large centrifugal

compressors, primary and secondary

steam turbines, and large gearboxes

• Machinery that uses pressure fed

sleeve bearings is normally both critical

to plant operations and very expensive

to repair

• It is essential that these rotors are

effectively monitored, protected, and

maintained to the highest standard

Orbit Measurement Sequence

orbit meas selection orbit meas setup orbit meas display

Orbit Measurement Display

shaft speed

view dual time

cursor (dot) at trigger location (line)

X / Y displacement

at cursor position

shaft position relative

to rotational center - for DC gap

measurements

individual meas.

• Two overall displays

for the DC Gap

measurements, one

for CH1, the next for

CH2

• Two graphic displays

for the two dynamic

orbit traces, one for

CH1, the next for

2 CH Spectrum / Time Waveform Meas.

both input channels captured

and displayed simultaneously

displayed in a split screen

• 1 – to display only the upper

2 CH Spectrum / TW Meas Setup

Single Shot or Continuous

option

Display Format option as either

Spectrum or Time

Input Channel option as either X

& Y or Z & Y

screen parameters as needed

2 CH Spectrum / TW Meas Display

2 CH Spectrum Display 2 CH Time Waveform Display

Cross Channel Phase Meas.

of input X relative to input Y

be displayed

magnitude/phase pairs with up to

8 orders of running speed

Cross Channel Phase Meas Setup

Display Format option as Phase

Input Channel option as either X

& Y or Z & Y

screen parameters as needed

Specify RPM Options

cross channel phase meas.

• dBase - Take the RPM value from the

GX’s database, if previously assigned

to the POINT

• Type In - Type in the value using the

numeric keypad, or

• Spec - Select the 1X RPM frequency

from a spectrum display

Cross Channel Phase Table

CH 1 and CH2 magnitude readings for eight

orders

cross channel phase readings for eight orders

shaft speed

Cross channel phase reading for highlighted order

• T key toggles between

phase table and spectral

Cross-Channel Phase Meas Storage

measurements in the Review

mode, occupying two lines

on the Non-ROUTE Review

screen

• The first measurement is the

CH1 spectrum, with the

relative phase angle table

• The second measurement is

the CH2 spectrum, without

the relative phase angle

table

Balancing

Measurements

• Real life balancing conditions require

a thorough understanding of

machinery vibration and balancing

techniques We strongly suggest

you attend the SKF Reliability

Maintenance Institute Machinery

Balancing course to gain balancing skills necessary for successful

machinery balancing jobs

• This course’s Balancing module

simply overviews the Microlog’s

balancing capabilities and introduces

a single-plane balancing procedure to familiarize you to the machinery

Microlog Balancing Overview

• Resolves single-plane, two-plane, and static-couple balances with high precision

• Interfaces with off-the-shelf laser tachometers,

optical tachometers, or stroboscopes for balancing phase measurements

• Balancing requires a shaft 1X signal either to the external trigger BNC input or to the phase adapter connector

• A TTL trigger is not required The Microlog allows for an external analog trigger, with an appropriate trigger threshold

Microlog Balancing Overview

additiona

l setup options

clear, comprehensive setup

menus and easy-to-follow

display screens with

g jobs

Balancing “Run” Overview

• Stop - Set Up Balancing Equipment and

Measurement Parameters

• Spin - Perform the Reference Run

• Stop - Attach a Trial Weight

• Spin - Perform the Trial Run

• Stop - Attach the Permanent Correction Weight

• Spin - Perform a Correction Weight Run

• Stop - If Necessary, Attach a Trim Weight

• Spin - Perform a Trim Run

Example Balancing Run Screens

Performing Bump Tests

Bump Test Overview

• When impacted, an object's natural or resonant

frequencies are excited A spectrum taken while the object is vibrating due to the impact shows spectral peaks that identify the object's natural frequencies

• Vibration forces transmitted by rotating machines

often excite natural resonance in attached structures Whenever such structural resonance appears,

vibration responses are amplified and can result in fatigue failures

• Identifying the machine’s resonance frequencies

allows a maintenance engineer the opportunity to

change the resonance frequency so as to reduce or eliminate damaging vibration

Bump Test Menu

review stored bump test results

Bump Test Setup

saves the current

bump test settings

take bump test data using the current settings

Bump Test Setup Fields

• Sensor Type – specifies the type of sensor used (typically Accel G )

• Sens (mV/EU) – transducer sensitivity

• Range (EU) (Full Scale) – specify the spectrum’s maximum amplitude

• X-axis units (Default Units) – Hz or CPM

• Filter – High-pass filter setting (typically 2 Hz )

• Freq Range (Fmax)– FFT upper full-scale frequency, up to 40,000 Hz

• Lines – spectrum’s lines of resolution

Bump Test Setup Fields (continued)

• Avg Type – Pk Hold or Exponential - for bump tests, specify Peak

Hold averaging The Microlog holds the highest spectral peak for

each hammer hit For exponential averaging, the Microlog averages multiple hits to minimize the noise level, however, you must pause the averaging process after the last hit.

• Display Y-axis – Linear or Logarithmic - specify the type of y-axis

scaling Typically set to Linear.

Bump Test Display Screen

frequencies

saves the current bump test spectrum

Saving / Reviewing Bump Test Data

• Bump test spectra cannot be uploaded

and viewed with SKF Machine Analyst

software

• Bump test spectra stored in comma

separated value format (.csv) in the GX’s

Mobile Device/Internal Disk/Analyzer

folder

• These csv spectra files may be viewed

with the GX’s Bump Test module, or may

be copied to the host computer (using

ActiveSync and Windows Explorer) and

viewed with Microsoft Excel or other host

Copying Bump Test Data to a PC

• Connect the Microlog to your host computer’s USB port, Microsoft ActiveSync

should display a Connected – Synchronized message

• Using Windows Explorer, copy the stored spectrum files (.csv files) from the GX’s

Mobile Device/Internal Disk/Analyzer folder to an appropriate folder on the

host computer

Backing Up Bump Test Files to PC Card

• Insert a memory card into the Microlog

• From the Review Data screen, select a

spectrum for backup, or select all

• Press and hold the Shift key (zero / up

arrow) to display the Backup function

button, then press the Backup function

button

• All specified spectral files are copied to

the PCMCIA/SD card

shifted function button

Recording Raw Signal Data

Recorder Overview

(time waveform) as a Microsoft Windows wav audio file

viewed on the Microlog for in-the-field analysis, or

analysis software where you can play the wav recording and post-process

vibration analysis measurements on it as

if you were performing measurements on

save recording setup

Recorder Setup Fields

• Input – (CH1, CH1 & CH2, or CH1 & Tacho)

• CH1 Type – Specifies the type of sensor used on CH1

Sens1 (mV/EU) – Use the alphanumeric keypad to enter transducer sensitivity in

millivolts (mv) per Engineering Unit (EU) for CH1

Range1 (Full Scale Value) - Specify the expected maximum amplitude range value

for CH1

If Input field is set to CH1 & CH2 or CH1 & Tacho, then CH2 Type and its

Sens2, and Range2 fields operate identical to those for channel one

• Freq Range (Fmax) – enter the FFT upper full-scale frequency in Hz, up to 20

kHz for CH1 inputs, or up to 10 kHz for CH1 & CH2 and CH1 & Tacho inputs

• Save To – (Internal, PC Card, or SD Card)

• Rec Time (s) – Specify the number of seconds to record the vibration signal

Recorder Setup Fields (continued)

• Rec Mode – (Manual, CH1 Level, or Tacho) Works with the Input field and following Trig Level field Specify whether to initiate data recording

manually, or to use a CH1 trigger level to initiate recording, or to use a

tachometer for triggering data recording, if Input is set to CH1 & Tacho

(in this case, as soon as the Microlog receives a tachometer signal, data recording initiates)

• Trig Level (EU) – If Rec Mode is set to CH1 Level, specify the channel

one trigger level to initiate data recording

Preview Mode

Preview mode

start recording

updates to display

channel’s live time

waveform signal and

overall vibration reading

Recording Data

recording time remaining

pause recording

freezes

remaining counts down

in the message area

ends, the Recorder –

Save Data screen

automatically displays

Saving / Reviewing / Copying / Backing Up

format (.csv) and wav format in the GX’s Mobile Device/Internal

Disk/Analyser/Recorder folder

Recorder’s Review Data option

for post processing

measurement results, for backing up measurements, for reviewing stored measurements, and for deleting stored measurements are identical with the Bump Test module

Quick Review