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Rockwell Automation 1441-DYN25-MBAL Balancing Extension Module for the Dynamix 2500 User Manual

Page 17

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Rockwell Automation Publication 1441-UM004A-EN-P - May 2011

17

Balancing Extension Module Chapter 2

2.

Perform the initial measurement.
a. Start the machine.
b. Take the initial measurement.

The initial measurement provides a starting place for balancing
computations. It records the machine's initial imbalance, 1X vibration
magnitude and phase angle. Later in the procedure, initial measurement
data is automatically compared with trial (weight) measurement data to
calibrate the machine's imbalance.

3.

Attach a trial weight.
a. Stop the machine after collecting the initial measurement data.
b. Add a trial weight.

A trial weight is a temporary weight attached to produce a change from
the original unbalance readings (reference run readings). Input the trial
weight amount and placement angle into the data collector.

4.

Perform the trial measurement.
a. Start the machine again with the trial weight securely attached.
b. Take trial measurement with the trial weight.

The trial measurement calibrates the machine's unbalance and allows
the data collector to calculate the influence coefficient and permanent
correction weight amount and placement. To allow for accurate
balancing computations, the trial weight should pass the 30/30 rule.

The trial weight should do the following:

Increase or decrease the 1X vibration amplitude by at least 30 %
Change the phase angle by at least 30

°

Be a combination of A and B.

5.

Attach the correction weight.
a. Stop the machine.
b. Remove the trial weight
c. Attach the specified correction weight at the specified angle.

6.

Perform a correction weight measurement.
a. Start the machine again.
b. Take correction weight measurement.

The correction weight run performs two functions:

It calculates the amount of residual imbalance with the correction

weight in place to confirm that the machine is now balanced within
tolerances.

If further balancing is necessary, it automatically applies the

influence coefficient to calculate additional trim weights that can be
added to further balance the machine.