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 Sensor
Placement during a Balancing Job
When performing a multipoint balancing job it’s
best to use multiple sensors and not move each sensor during the balancing
process. Moving the sensor creates error as the sensors are never placed
back in exactly the same spot. Even if using a single channel meter for the
balancing job, use multiple sensors and cables and merely swap the cables
when taking the next measurement point. This will improve the accuracy of
the data and the speed of the balance process by possibly eliminating one or
more unnecessary weight adjustments or moves.
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Placement
of Reflective tape when using Tachometers
When balancing a piece of equipment that was
previously balanced using an Optical or Laser tachometer, you may find that
it is rarely possible to re-use the old contrast media (reflective tape) if
it’s still there at all. The reflectivity of the material degrades over
time, especially if it has been handled with bare hands or dirty/oily
gloves. Or, the reflective tape may be deteriorated to the point it’s
entirely unusable or the adhesive has broken down and the reflective
covering material has come off altogether. In order to maintain consistency
between personnel performing balancing jobs, place the leading edge of the
reflective tape on the trailing edge of the keyway. This really helps if you
are re-using an old balance job to perform what is known as a one-run
balance.
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Number
the blades on a Fan starting at the Keyway
One thing that always helps when balancing fans
is to number the blades against rotation starting with the blade that is
closest to the keyway. Do this right away, the first time the fan cover or
door is opened. This is helpful when attaching or removing weights as the
blade number can help ensure the proper add/remove location of the weight.
Example: If you have a fan with 12 blades, the keyway reference allows you
to set up the same configuration every time. Use the keyway as 0° (zero
degrees) then blade #1 (the one most closely aligned with the keyway) is 0
degrees, blade #2 is 30 degrees and so on. This process helps prevent
weights from being placed in the wrong position, creating extra balancing
runs or the destruction of the equipment if the vibration were to increase
too much.
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When balancing equipment where the length of
the rotor is greater than twice its diameter, it may be necessary to divide
the static and couple vibration. This will speed up the balancing job by
solving each part of the problem individually instead of trying to do it all
at once.
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trial
weight
When balancing, a trial weight should change
the vibration readings by 30% and the phase by at least 30 degrees. This is
called the 30/30 rule.
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