User guide

86
Fuel Tank Level Sensor
Float Type
Any standard 40-240 Ohm float style probe should work without any problem. The single wire from the
Engine Harness should be connected to the float sensor terminal. You should verify that the float mounting
base is attached to the airframe ground. For the tank gauges to work properly the floats should freely move
from the top to the bottom of the tank.
Capacitance Type
If your system was setup at the factory for Capacitance fuel tanks inputs you can use any probe or adaptor
that puts out a 0-5 Volt DC signal. You MUST place a 1.5K OHM resistor in series with the fuel tank input
wire to limit the voltage to 4 Volts.
Trim & Flap Position Installation
The system is designed to read the position transducer that is in
the MAC trim servo. The MAC servo has 5 wires. The two white
wires are for motor operation and the color-striped wires are for
the position transducer.
The flap position can be measured by using the MAC linear
position sensor P/N: POS-12
http://www.rayallencompany.com/products/indsens.html
CAUTION: DO NOT connect the MAC indicators and the AF-
3400/3500 to the MAC trim servos. The MAC trim indicators are +12V and the AF-3400/3500 is +10V. The
power and ground wires connect to all the servo’s.
CAUTION: Verify before turning the system on that you have the trim servo wiring correct. If the +10V or
Ground connection is wired to the WHT/GRN wire on a servo you could damage the servo.
Pin 2 Yellow +10V Trim and/or Flap WHT/BLU
Pin 3 Black Ground Trim and/or Flap WHT/ORN
Pin 34 Blue Flap Posn Flap WHT/GRN
Pin 35 Brown/Yellow Elevator Posn Trim WHT/GRN
Pin 36 Brown/Blue Aileron Posn Trim WHT/GRN
Pin 12 Not Pinned Rudder Posn Trim WHT/GRN
Note: Trim & Flap Positions MUST be calibrated. See the Instrument Calibration section.