General Installation
Vibrex 2000 and Vibrex 2000 Plus User Guide 53
4.4.2.2 General Photocell Use
The photocell triggers, that is it sends the timing pulse to the balancer, as
the target leaves the photocell beam. This being the case, if the user wants
to do really accurate alignment of the target in the beam between
adjustments, simply pull the target through the photocell beam until the
alignment light on the back side of the photocell just goes out, then stop.
Using an erasable marker, make two marks next to each other, one on the
spinner and one on the cowl. It doesn't matter where. One can then always
align these marks and know the photocell beam is aligned with the target
on every adjustment. Over the long haul, this accuracy will save quite a
bit of time, and eliminate errors in target placement.
Most of the targets are rectangular. Most of the installations for the
photocell result in a beam that hits the propeller in an arc. It is possible
that the beam might “cut” the target at something less than its length. This
is truer of placements close to the center of rotation than farther away.
Keep in mind the pitch of the propeller can change too, causing loss of
signal on the target.
4.4.2.3 Repair of Photocell Wiring.
The photocell is used in the sourcing mode. The wire color codes are
shown in the table below.
Color Source Pin
Brown +10-30 Vdc A
Blue DC Common B
Black Signal Source D
White Signal Sink Not Used
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