Gen II User Manual
10-7 – Fan/Turbine Balance Chapter 10 Revision 2.10, Apr 2020
applicable Maintenance Manual if you are not familiar with the modifier used for
this application.
10.1.1.17. When all fields are completed as required, press [OK] to proceed.
10.1.2. – Fan/Turbine Balance Speeds Screen
10.1.2.1. If you selected a number of balance speeds in paragraph 10.1.1.11 above, the
“Fan/Turbine Balance Speeds” banner screen will be displayed. If you selected
“Select in Job”, the “Define Class Wts” screen will appear (see item 10.1.3). The
number of speeds (Num Baln Speeds:) line will display the number entered in
step 10.1.1.11.
10.1.2.2. If multiple sensors were defined in paragraph 10.1.1.10 above the “All Sensors
Use the Same RPM;” line will be present. If the same engine RPM settings will
be used for all balance measurements, select “Yes”. The analyzer will use the
RPM settings shown under “All Sensors” on the L/H example below. Setting this
entry to “No” will cause the labels to change to “Sens 1” and “Sens 2” as shown
in the example below on the right. Enter values for the speed settings for the first
sensor in the first column and the speed settings for the second sensor in the
second column.
10.1.2.3. Press the [] key to move the cursor to the “Balance Relative to Defined Peak
Speed?” field. The field will be highlighted and defaulted to the “No” answer as
illustrated in the first screen below. With the “No” answer displayed, the entered
speeds are not relative to the highest peak vibration. In this case, press the []
key to move to the “Enter Speeds As N% or Defined RPM” field and enter the
speed(s) determined from the fan survey or applicable Maintenance Manual. You
may enter the speed(s) as an actual RPM or %.
If the speeds are to be entered based on a vibration survey and relative to the
highest peak encountered, use the [] key to toggle the answer to “Yes” in the
“Entered RPM Relative to Peak:” field. Press the [] key and a new field “Peak
Speed:” will appear as shown in the second screen below. Use the keypad to
enter the speed at which the highest amplitude peak occurred in the fan survey.
Press the [] key to move to the “Enter Speeds As N% or Defined RPM” field
and enter the variance in speed relative to the Peak Speed entered. For instance, if
the Peak speed was entered as “90” indicating 90% RPM, you might enter three
speeds as “-1”, “0”, and “1” to indicate speeds of 89, 90, and 91 % respectively.
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