Rockwell Automation 1441-DYN25-MBAL Balancing Extension Module for the Dynamix 2500 - Manual (Page 18)

18 Rockwell Automation Publication 1441-UM004A-EN-P - May 2011
Chapter 2 Balancing Extension Module
7. If additional trim weights are necessary to balance the machine within
tolerances, stop the machine and attach the specified trim weights.
a. Stop the machine.
b. Attach the specified trim weights.
c. Take another measurement.
8. Perform a trim measurement.
a. Start the machine.
b. Take a trim measurement to verify the machine is balanced within
tolerances. If not, you can take additional trim measurements.
Static-couple Balancing With stiffer rotors, a two-plane procedure may reduce the amount of imbalance
to target tolerances. However, with narrow or flexible rotors, more often a
static-couple procedure works best.
This graphic shows a narrow rotor showing three heavy spots.
The static-couple procedure corrects the static unbalance with weights added to
the center of gravity plane, and corrects the couple unbalance with weights added
to the end planes.
In practice, a static-couple balancing procedure is almost identical to a two-plane
balancing procedure, except that it provides three correction weight solutions
instead of two. One correction weight for each plane, and an additional
correction weight to correct the static unbalance.
Unless you are able to attach weights to the machine’s center of gravity plane, the
static weight is typically split in half and applied to the end planes to correct the
static unbalance.
In as such, on the data collector, the static-couple procedure is identical to the
two-plane procedure except the Correction Weight and Trim Weight screens
show three correction weights for the static-couple procedure:
• One weight for end plane 1
• One weight for end plane 2