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Bruel and Kjaer EMS Inc.
Balancing - Type 7790-A
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Two-plane Balancing Consultant Type 7790-A is an intuitive and effective tool for in-situ (field) single-plane and two-plane balancing of rotating machinery. Multiplane Balancing Consultant Type 7790-B adds threeand four-plane balancing. A task-oriented user interface guides you quickly and safely through the necessary steps for setting up, measuring, validating and reporting. Fast trim balancing using stored rotor data is also supported.
The balance quality can be determined according to established balance quality grades (ISO1940.1) or according to maximum machine vibrations. The balancing procedure can be FFT-based or based on order tracking for the most accurate results.
Uses
• Dynamic, in-situ balancing of rotating machinery
• Trim balancing using stored rotor data (influence coefficients) from previous balancing measurements
• Part of complete solutions for rotating machinery analysis and machine diagnostics including:
○ Measurement transducers and accessories
○ Conditioning, measurement and analysis using the PULSE multi-analyzer system
Features
• Task-oriented user interface that guides you through all the stages of a balancing measurement
• Balancing based on phase-assigned spectra
• FFT-based balancing method for standard balancing on machines with stable speed
• Order tracking-based balancing method for complex balancing on machines with unstable speed (requires Order Analysis Type 7702)
• Balance quality according to established grades (ISO 1940.1) or maximum machine vibrations
• Alarms for excessive vibration levels and speed
• 3D rotor geometry illustrations for easy overview of measuring planes and correction planes
• 2D graphical views of correction planes with weight positions and of measuring planes with transducer positions
• RPM meter with analog and digital read-outs, service speed range and maximum allowable speed
• Display of triggered tacho signal for optimal settings of tacho detection parameters
• Display of vibration time signals and spectra
• Vector polar plots of fundamental frequency/1st order
• Indication of initial, trial, final and optimisation run results in vector polar plots
• Tables of measurement results and applied masses
• Weight splitting for use of standard masses and/or predefined mass positions
• Support of predefined, distinct masses for simplified input
• Fast direct print of reports in predefined layout
• Reporting using Microsoft® Word in predefined layout or formatted according to ISO 20806
• Vibration as displacement, velocity or acceleration
• Support of both SI and Imperial units
Description
Unbalance is a result of uneven distribution of a rotor’s mass and causes vibration to be transmitted to the bearings and other parts of the machine during operation. Imperfect mass distribution can be due to material faults, design errors, manufacturing and assembly errors, and especially faults occurring during operation of the machine.
By reducing these vibrations, better performance and more cost-effective operation can be achieved and deterioration of the machine and ultimately fatigue failure can be avoided. This requires the rotor to be balanced by adding and/or removing mass at certain positions in a controlled manner.
Two-plane Balancing Consultant Type 7790A supports single-plane and two-plane balancing with determination of balance quality according to ISO 1940–1. The balancing process is performed as insitu balancing (field balancing) where the rotor is balanced in its own bearings and supporting structure, rather than in a balancing machine.
Trim balancing, using stored rotor data (influence coefficients) from previous balancing sessions is also supported, ensuring fast correction of small residual unbalances in cases where balancing has to be repeated.
The Balancing Consultant has an intuitive, task-oriented, graphical user interface leading you quickly through the necessary tasks for setup, measurement and reporting.
Balancing FFT / Balancing Tracking
Balancing can be based on either frequency spectra (FFT) or order spectra (order tracking). Traditional FFT-based balancing is sufficient in many measurement situations. However, in cases with unstable machinery speed and/or high frequency resolution requirements, order tracking should be used to eliminate frequency smearing and provide more accurate results.
Balancing using order tracking requires Order Analysis Type 7702. As Balancing and Order Analysis address the same kind of machinery, the hardware accessories for the two configurations are also the same.
