FAG Detector III User Manual page 235

3. Trial run
: plane 1 (additional test measurement at plane 2 where two-plane
241
balancing is carried out): During the test measurement the response of the
rotor to defined weights is analyzed. The imbalance in the machine is altered
by attaching the test weights. The Detector now determines the change with
reference to the last measurement (for the first trial run, this is the reference
measurement) and calculates the coefficients used to determine the optimum
position of the balance weights.
4. Display of coefficients and attachment of balance weights
displays the calculated influence coefficients. To perform the trim run, attach
the weights at the positions calculated by the Detector.
5. Trim run
: The Detector now performs a measurement to check whether or
245
not the vibration caused by the imbalance exceeds the limit defined by
Trendline . If the balancing procedure was successful, the Detector displays
69
a table of results and exits the balancing menu. If not, you can attach weights
using the existing coefficients, then repeat the check or determine new
coefficients by performing a new test measurement.
The Detector guides you through the individual steps of the balancing
measurement and marks the menu items that are currently selectable. If the
symbol is displayed in front of the menu item it can be selected, otherwise the
Detector shows a
Important information
If a balancing measurement has been already carried out for a component the
Trendline software sends the coefficients of the last trim run to the Detector.
Once the reference measurement has been carried out you can decide
whether you wish to proceed with the trial run in order to determine new
coefficients. Alternatively, you can view the "old" coefficients directly and attach
the weights accordingly. However, this is only possible if the current rotational
speed corresponds to the speed measured during the previous balancing
measurement.
If the test weights selected during the trial run are too small, the coefficients are
calculated inaccurately. The suggested balancing weight is probably too large
in this case, which can result in damage to the machine during the trim run. If,
however, the test weights selected are too large, damage can occur as early on
as during the trial run. During the trial run, the Detector therefore checks
whether the test weights being used effect a large enough change in the
vibration. If the change in vibration from all of the sensors is too low, the
Detector will return a warning message. You can then decide whether to repeat
the trial run with larger weights or accept these without making any changes.
Always check whether the test weights selected for your machine are plausible.
The Detector also calculates a suggested value for the test weights if the rotor
mass and radius to which the weights can be attached were specified in the
.
Detector III
: The Detector
244
235