Two plane balancing – Rockwell Automation 1441-DYN25-MBAL Balancing Extension Module for the Dynamix 2500 User Manual
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Rockwell Automation Publication 1441-UM004A-EN-P - May 2011
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Balancing Extension Module Chapter 2
Two Plane Balancing
With two-plane balancing, the measurement sequence proceeds in the same
order as with single-plane balancing, except two trial weights and two trial runs
are required to calculate four influence coefficients (only one influence
coefficient exists for single-plane).
The balancing of a machine in two planes is divided into taking these three
measurements:
• Initial measurement
The initial vibration measurement is taken without any added weights on
the machine. The initial vibration measurement establishes a reference of
how the machine vibrates at each plane without any extra weight added.
This vibration is what is corrected by the correction weight.
• Trial weight measurement
The trial weight measurements are taken with a single trial weight attached
to the machine at one plane or the other. The trial weight measurements
are used to determine how the machine is affected by the added weight.
The ideal trial weight should produce either a 30 percent change in
amplitude or a 30 ° change in phase.
• Residual measurement
The residual measurements are taken with the correction weight or the
correction weight and trim weights attached to the machine. The
correction weight should cancel out the initial unbalance. A residual
vibration measurement is taken to measure the remaining unbalance. Trim
weights are added to the machine to cancel out the vibration measured
during a residual measurement.