How to do field Balancing by 904 or 907.ppt

Prepared by Dr. L.W.Tao of Beijing Sendig Technology Co. Typical Steps of field Balancing Illustration with model 907 An Overview of the Steps Collecting Machine data Preparing Instrument Sensor Balancing really required ? Balancing possible ? Procedure of balancing Step 1 - Collecting Machine data Understand the machine to be balanced as much as possible Collect machine data Take a photo of the machine Step 2 - Preparing Instrument Sensors Sendig-904/907 dual-channel data collector/analyser/balancer A notebook computer Sendig-MCM3 Analysis Software Step 3 - Balancing really required ? Use 904/907 to measure overall vibration values Compare with ISO Standard Step 4-1: Balancing possible?  – “single peak spectrum” ? Use 904/907 to measure vibration spectrum Only “single peak spectrum” can go for balancing Step 4-2: Balancing possible ?  – “90o phase difference” ? Use 904/907 to measure vibration phase difference between vertical and horizontal directions Only “90o phase difference” can go for balancing Procedure of balancing Different Kinds Of Imbalance Characteristics Of Imbalance Basic Principle Of 1 Plane Balancing Illustration of 1 Plane Balancing Method of Influence Coefficients Method of influence coefficients is widely used, its step as the following (1 plane balancing as example): IF THE INFLUENCE COEFFICIENTS ARE KNOWN, THE STEP OF FIXING TRIAL MASS ARE IGNORED The former steps are simplified as the following: 1) measure initial measurement 2) input influence coefficients 3) calculate the result of balancing mass NOTICES DURING THE OPERATION Confirm the dynamic balancing are needed according to spectrum and phase analysis. Direction of phase: reverse to the direction of rotation SELECTING PARAMETERS Measure displacement or velocity for middle or low speed machines Measure velocity or acceleration for high speed machines 1-PLANE BALANCING Without influence coefficients Operation Basic Prompt is displayed at the