Rockwell Automation 1441-DYN25-MBAL Balancing Extension Module for the Dynamix 2500 - Manual (Page 32)

32 Rockwell Automation Publication 1441-UM004A-EN-P - May 2011
Chapter 2 Balancing Extension Module
Take a Trial Run 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 % change in amplitude or a 30 ° change in
phase.
Follow these instruction to take a trial weight measurement.
1. With the trial weight securely attached to the machine, start the machine
and bring it back up to the same speed used with the initial run.
2. Press Enter to start taking trial weight measuremnt.
The Trial Run 1 screen shows vibration magnitude and phase readings
with the trial weight attached. For accurate balancing efforts, these
readings should satisfy the 30/30 rule. From the reference run, the trial
weight causes a 30% change in magnitude, or a 30 degree change in phase,
or both. The Dynamix 2500 data collector automatically analyzes the data
to determine if the 30/30 rule is being met.
• The Trial Run magnitude is between 70% and 130% of the Initial Run
magnitude, and the Trial Run phase is within ±30 of the Initial Run phase,
the 30/30 rule is not being met, this warning appears: