TruTrak EMS BU (8300-065) - Manual (Page 14)

TruTrak Flight Systems 12 EMS Installation Manual
JUNE 2009 8300-065 Rev D
Trim and Flaps Position Potentiometers
Most flap and trim sensors are potentiometers (variable resistors) which require power and ground inputs,
and supply an output that is a function of position. These potentiometers come in a variety of resistance
ranges. A typical trim sensor connection, +5 volts (pin 22) to one side of position potentiometer. The
other side is Ground (pin 4), and the center is the output signal (pin 6).
Ray Allen sensor, If the Ray Allen indicator is not used, connect the white/orange wire to the (5V)
excitation line (pin 22), the white/blue wire to (GND) (pin 4), and its white/green wire (signal output) to
(pin 6) on the J1, 37 pin connector. If the display is used, splice off the green/white wire connect to the
EDM (pin 6). Either installation must be calibrated.
Current Sensor (8250-044)
The ammeter transducer can be installed in your electrical system in one of three
locations as shown in the (simplified) electrical diagram below.
Position A-C: Ammeter indicates current flow into or out of your battery. In these
positions, it will show both positive and negative currents.
The current transducer is not
affected by high current levels.
Position transducer so that the
attaching arm points toward the
positive battery post.