TruTrak Digiflight Install Manual - Manual (Page 11)

TruTrak Flight Systems DigiFlight Autopilot Installation Manual
9 March 2002 Printing
DigiFlight 200 / DigiFlight 200 VS Initial Checkout
Once wiring is completed the autopilot should be tested in the aircraft while on the ground. The first step is to enter the setup
mode on the autopilot and set all parameters to their correct values. Apply power to the autopilot programmer.
The initial screen should be displayed, along with the words PWR UP in the lower-right of
the display. After approximately ten seconds, the autopilot is ready to be set up for
operation, indicating AP OFF on the display.
Many of the operations of the autopilot are initiated or confirmed by a press and release of
the knob (without rotating it). This is referred to as the ENTER operation. Special setup
operations and disengaging of the autopilot are done by holding the knob in for an
extended period of time. Any time there is an underlined field showing on the autopilot
screen, rotating the knob will cause the underlined active field to change.
Engage the autopilot by pressing ENTER. Then press and hold the knob in for about eight
seconds until the first setup screen, showing LAT ACTIVITY and LAT TORQUE is
displayed. (During this time the screen will change to indicate “AP OFF” but continue
holding in the knob.) Once the activity setup screen is on the display, rotate the knob as
necessary to set the lateral activity value to a value of 1 or 2. ENTER to enter that value
and advance to the lateral torque field. Insure that the value displayed is somewhere close
to the maximum value of 250. Once that is done, press ENTER to enter that value and
advance to the next screen.
Rotating the knob, select a value for BAUD RATE which is compatible with the panel-
mount GPS receiver connected to pin 25. The value of 9600 is the most commonly used
rate. Once baud rate selection is done, press ENTER to enter that value and advance to
the next screen.
The next screen gives the option for calibrating the internal backup magnetometer. To the
MAG CALIBRATE? Question, answer N (no) at this time. This operation will be done at
a later time.
Press ENTER.
The DigiFlight display will now continue to the next screen, which allows setup for
Vertical Activity and Torque. Rotate the knob as necessary to set the vertical activity to a
value of 1 or 2. Press ENTER to enter that value and advance to the vertical torque field.
Insure that the value displayed is somewhere close to the maximum value of 250. Once
that is done, press ENTER to enter that value and advance to the next screen.
The next screen allows a minimum airspeed to be set. The minimum airspeed value is the
slowest indicated airspeed the autopilot will fly, independent of what it is commanded to
do. Rotate the knob to adjust this airspeed to a value safely above a stall but lower than
normal approach or climbout speeds. Select the desired value, then press ENTER.
The next screen allows an adjustment for the amount of delay, or “lag” in the aircraft static
system. Start with a value of zero until the first flight test of the autopilot. Having verified
this selection and set it to zero if necessary, press ENTER. The autopilot will now leave
the setup mode and go back to the main screen display.
MAG 005
AP OFF
LAT ACTIVITY 2
LAT TORQUE 240
BAUD RATE 9600
MAG CALIBRATE? N
VRT ACTIVITY 2
VRT TORQUE 240
MIN AIRSPD 90
STATIC LAG 0