Gen II User Manual
9-9 – Transient Balance Chapter 9 Revision 2.10, Apr 2020
9.1.3.1. In the “Num Balance Speed Bands:” field, use the [] key to select the number of
separate speed ranges you wish to configure for the balance run. The default is “1”
This would be appropriate for performing an acceleration balance on an engine with
no “Cautionary Ranges” of operation or on an engine with one single vibration target
across all ranges of fan operation. Multiple bands will be required if different speed
ranges of the fan operating range have different targets or if you are warned or
prevented from slowing or dwelling in particular fan speed ranges.
9.1.3.2. Press the [] key to move the cursor to the “Acquire on:” field. This field allows you
to choose when data will be acquired for the balance. Use the [] key to choose
between “Accel”, “Decel”, or “Both”.
9.1.3.3. If “Both” is selected in the “Acquire on:” field, the “Order:” field will be displayed.
Use the [] key to move to this field. This field allows you to choose the order in
which data will be collected. Use the [] key to choose between “A/D” (acceleration
followed by deceleration) or “D/A” (deceleration followed by acceleration).
9.1.3.4. Press the [] key to move the cursor to the “Acc/Dec Ramp (s):” fields. The display
of these fields is determined by the selections made in paragraphs 9.1.3.2 and 9.1.3.3.
Use the [] key to select a time, in seconds, you will accelerate or decelerate the
engine to collect vibration data. Available selections are “60”, “120”, “180”, “240”,
and “300”.
9.1.3.5. Press the [] key to move the cursor to the first speed field under the “Speeds”
columns. Use the keypad to enter a minimum speed for the first speed band. The
speed may be entered as N1% or actual RPM. If N1% is used, the value must be
equal to or greater than “20.0”. If actual RPM is used, the value must be equal to or
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