Section 12 — Balancing Walkthrough
235
Step 2 — Take Initial Reading
To take an initial reading:
1. Stop the machine.
2. Attach the sensor to the bearing housing closest to the rotor.
TIP: For best results, attach the sensor in the radial direction in
which the machine is most flexible (and vibrates the most).
For dual plane balancing, attach a sensor to each of the
bearings supporting the rotor. It is NOT important how the
sensors are paired or which sensor is attached to which
end.
3. Set up the tachometer (see Setting up the Tachometer.
4. Start the machine > Let the rotor settle to its normal operating
speed.
NOTE: Because the vibration level depends on the speed of the
rotor, it is important to take all readings while the rotor is
operating at its normal speed.
5. Press from the Balance Setup menu to take the initial reading
—The initial reading measures the out of balance level of the rotor.
6. After a few seconds, the instrument displays the speed of the rotor
in RPM and Hz, the vibration level due to the imbalance (i.e.
amplitude at 1X the rotor speed), and the phase angle of the
vibration.
For dual plane balancing, two sets of values display.
7. Wait for the readings to stabilize > Press .
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