User Manual

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Figure 8: LED Operational and Error Codes

Oscillations

Sometimes, when the controller gains are set very high or if your model flies at a very high airspeed, oscillations can develop. If

oscillations occur, turn down the Master Gain knob or the specific gain dial for that axis, until the oscillations stop. Other causes of

oscillations include mechanical slop in control surfaces and slow servos. If your model has digital servos, higher gain values may be

possible by increasing the Output Servo Pulse Frequency. See: List of Menu Features and Options: Output Servo Pulse Frequency.

Oscillation Suppression

To help reduce pilot workload, the Guardian will automatically scale down the Overall Gain when it detects oscillations. To do this, it

incrementally scales the Overall Gain down to a minimum of 50% of its currently set value. After the oscillations are eliminated, it will

slowly increase the Overall Gain back up to 100% of its set value or until oscillations are detected again, whichever comes first.

If oscillations occur and subsequently disappear, it is recommended that you slowly reduce your gains to prevent this from happening in

the future.

Do not increase the Overall Gain after an oscillation has been suppressed, since doing so will only cause more oscillations until the

Oscillation Suppression is unable to reduce the Overall Gain sufficiently to be effective.

Preventing Damage from In-Air Recovery

The Guardian is a great tool for beginners looking for a safety net in case of lost orientation or control, however switching to 2D Mode

with a combination of too-high airspeed and gains may cause damage to the airframe. If the model is not structurally capable of pulling

out of a steep dive very quickly, some configuration may be needed to prevent excessive G-Forces. Reduce the Overall Gain (if

connected) during high speed maneuvers or limit the travel of the servos through the PC software’s Expanded / Custom Servo Ranges

configuration tool under the “Servo Config” tab. Test your changes carefully and conservatively.

Tuning for Optimal Gains

While not needed for a good stabilization experience, there is a maximum gain configuration that can be found that will provide the best

flight performance with the Guardian. This entails setting the highest gains for each axis without triggering oscillations. To do this, start

out with the individual gain control dials set for their maximum correct deflections as described in the “Overview/Quickstart” section.

Take off with the Master Gain control knob turned down low and once at a safe altitude and cruise speed, turn it up slowly to enable

stabilization. Continue turning it up until an oscillation occurs. Note which axis upon which it occurs, reduce the overall gain, and land.

Reduce the individual dial gain of the axis that was showing oscillations. Repeat this process until all three axes oscillate at the same

Overall Gain level or no oscillations can be triggered.

Status LED

The Guardian’s LED uses blink sequences to convey information about system status, the current flight mode and any errors that have

been detected.

The LED will turn ON for 2 seconds, and then slowly blink the number representing the Model Control Type currently selected.

(1 blink = Standard, 2 = Elevon, 3 = V-Tail)

LED Indication during Startup

The LED will turn ON for 2 seconds, and then slowly blink the number representing the Model Control Type currently selected. After

this startup blink sequence, the LED will display steady state status. See List of Menu Features and Options: Model Control Type.

LED Indication during Steady State

• Solid On: 3D Mode

• One repeated blink: 2D Mode

• Solid Off: Stabilization Disabled

Additional LED Messages

• 2 repeated blinks: Radio Stick Menu is active

• 3 repeated blinks: USB is connected

• 4 repeated blinks: Error condition. Error type is indicated by a pause and a

number of additional, faster blinks:

o One blink: Brownout – BEC or receiver battery is providing

insufficient power for your servos and the Guardian. See the

BEC/Receiver Battery Power Requirements section above.

o 2 – 5 blinks: Memory / Calibration Errors – Repower the Guardian

to clear. If this problem occurs repeatedly, contact technical support.

o 6 blinks: Sensor Fault – If this problem occurs repeatedly, mechanical stress or damage to the board may have occurred.

o 7 blinks: Internal error. If this problem occurs repeatedly, contact technical support.