Baltech VP-3470 Operation Manual
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BALTECH VP-3470Operation manualOperation conditions and prestarting procedures 27or two directions where the foundation stiffness is the lowest.If the foundation stiffness is much the same in all three directions, the measurementsshould be made in all the directions. If the foundation stiffness is different in threedirections, the measurement can be made only in the direction of the lowest stiffness.Moreover as opposed to monolithic structures the stiffness of the frame structuresin the horizontal and axial directions are usually much higher than in the verticaldirection. So the vibration levels can be higher in these directions than in the verticalone.Most attention should be given to the horizontal direction where the stiffness is lowerand there is always an internal source of dynamic forces generated be the rotatingrotor (as opposed to axial direction where high dynamic forces occur usually onlydue to poor alignment).Never install the vibration sensors on auxiliary production parts: slopes, shrouds,etc. even if the vibration in these parts is the highest.5.2.4. Accelerometer installation during the balancing and diagnosticsThe measure points are selected based on the following:а) First of all it is necessary to control the vibration levels on the bearing unitsbecause they fully take the dynamic forces generated by the unbalanced rotor. Asa rule, the measurement directions are vertical and horizontal, i.e. radial to therotation axis. The balancing should be performed based on the measurementresults, in the points (and directions) of the highest vibration level;b) Before and after the balancing procedure it is necessary to measure the vibrationaccording to the recommendations given in the p. 5.2.3;c) Additional measurement points can be measured depending on the individualrequirements to a particular machine. If the vibration levels at the rotation frequencyin the axial direction are comparable or exceed the vibration levels in the radial |
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