Safety System (Failsafe)

Page Incomplete

This page is not yet complete and is for reference only.

Fidelity X has comprehensive built-in safety protection mechanisms to ensure flight safety.

Always Enabled

The safety system is always enabled and cannot be disabled.

---

Protection Features

Feature	Description
RC Signal Loss Protection	Detects RC signal loss and executes protection actions
Battery Voltage Monitoring	Real-time monitoring with OSD warnings
Arming Condition Check	Checks conditions before allowing arm

---

RC Signal Loss Protection

Two-Stage Protection Strategy

Stage	Trigger	Default Action
Stage 1	Signal loss detected	Stabilize flight attitude
Stage 2	Stage 1 timeout	Safe shutdown

Stage 1

After signal loss, the flight controller will:

• Set Roll/Pitch/Yaw to center
• Maintain throttle
• Maintain stable flight attitude

Purpose: Give RC signal a chance to recover

Stage 2

If Stage 1 times out, the flight controller will:

• Stop all motors
• Prevent loss of control from causing greater damage

---

Parameter Configuration

RC Loss Parameters

Parameter	Default	Description
FS_RC_LOSS_STAGE_1_TIME	150	Stage 1 duration (ms)
FS_RC_STAGE1_ACTION	1	Stage 1 action
FS_RC_STAGE2_ACTION	3	Stage 2 action
FS_LAND_THROTTLE	0.3	Throttle value during RC loss

Action Types

Code	Action
0	No action
1	Channel override (stabilize flight)
2	Auto land
3	Shutdown

Battery Parameters

Parameter	Default	Description
FS_BAT_WARN_V	14.4	Warning voltage (V)
FS_BAT_CRIT_V	13.2	Critical voltage (V)

Note

Battery monitoring only shows warnings on OSD, it won’t trigger shutdown.

---

Arming Conditions

Before arming, the system checks:

• Sensors functioning normally
• Throttle at minimum
• RC signal valid
• Accelerometer calibrated

All conditions must be met before arming is allowed.

---

View Status

failsafe status

Shows current safety system status.

---

Testing

Warning

Remove propellers before testing!

# Test RC loss response
failsafe test rc

# Test arming conditions
failsafe test arming

# Reset state
failsafe reset

---

Configuration Examples

Racing Configuration

Faster response:

param set FS_RC_LOSS_STAGE_1_TIME 100
param save

Long Range Configuration

Give signal more time to recover:

param set FS_RC_LOSS_STAGE_1_TIME 500
param save

---

Pre-Flight Check

1. Confirm Failsafe status is normal
2. Test RC loss response (turn off transmitter)
3. Verify you can regain control after signal recovery