Section 10: Balancing Walk-through
149
Step 3. Trial Weight Reading
• Stop the machine.
• Establish a reference mark on the balancing plane. This will
be used to measure the angular position of the trial weight
and the final balance weights. The reference mark can be at
any position around the balancing plane. It does not need to
be referenced to the tachometer reflective tape position.
In dual plane balancing, establish a reference mark on the
Right plane also. It does not need to correspond with the Left
plane reference mark.
• Attach a trial weight to the balancing plane. It is important
that the trial weight is not too large as it may damage
machine bearings, and not too small as its effect will be
imperceptible. If you are unsure how much weight to use
press
from the Trial Readings Menu to access the
Suggest Trial Weight Menu. From here you can calculate an
appropriate weight to use. When you have finished press
to return to the Trial Readings Menu.
Note: You can use any weight unit (gram, kg, oz, lb), without
informing the instrument. The instrument will express the final
balance weights in the same (implied) units.
In dual plane balancing, attach the first trial weight to the
designated Left plane.
• The trial weight position should be near the rim of the rotor
but can be at any angular position. Starting at the reference
mark, measure the angular position in the direction specified
for the Angle Measurements parameter in the Set Balancing
Parameters Menu. This will be either WR (with rotation), or
AR (against rotation).
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