Honeywell Vibrex 2000 User Manual page 90

Chapter 4 - Installation
rear IPS increases, the propeller does not need to be
balanced. The cause of the imbalance is probably the crank
shaft or an asymmetric aerodynamic loading on the
propeller.

The user can check for an symmetric loading on the
propeller by dynamically tracking the propeller with the
Strobex. If the user can discount the propeller as a source of
any vibration, the only way to correct the problem is to
examine the crank shaft.

There are several commonly used locations on flat opposed
engines.

Because of differences in cowling, baffling, and accessory
sections, make sure that the transducer is mounted in such a
way that the engine can get enough air for cooling during its
run-up.
Velocimeter Brackets -
application kits are adequate for general use.
4.4.2
The operational end of the Vibrex 2000 or Vibrex 2000 Plus
photocell system is the Banner photocell probe (from now on
called the photocell). This unit is self-contained and uses a
visible red light (650 nm) from a light-emitting diode (LED)
triggered by a retro-reflective target. This light reflection sends a
one-per-revolution pulse to the Vibrex unit for frequency-and-
balance phase measurement.
Photocell Range -
to approximately 7 ft. For the best results, place the photocell
approximately 2 ft from its companion retro-reflective target.
Honeywell Confidential: Use or disclosure of information on this page is subject to the restrictions on the title page.
Generally the brackets supplied in the
Photocell System
The effective range of the photocell is 3 in.
13841 Rev A
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