Ignition Path and Interlocks
Below is the schematic for the ignition path and safety interlocks.
- Rocket must send a 5v signal telling logic gate it is ready
- Shore power must not be present on the umbilical to rocket
- Once both conditions are true, there is an R/C timer circuit which will take 5 seconds to charge and be ready.
- Once R/C circuit is charged, it triggers a SPDT relay to allow LIPO battery into the ignition path.
- When not triggered, the LIPO battery is on a charging path to a LIPO charger.
- After passing through the ignition board, the ignition path goes to a relay located on the Phidget relay board and controlled by the ground control team.
- Ground control triggers the relay to fire, allowing ignition to the safety-kill system.
- Safety-kill is a physical jumper bar on the outside of the LTC box. Jumper must be pulled from the LTC box and pushed into the Away Box to enable the ignition path to continue to the Igniter Box. If jumper is not moved, a fuse will blow killing the ignition path.
- Ignition path continues to away box (where an LED indicates if system is trying to fire before the jumper placed in to enable ignition path).
- Ignition path continues to the Igniter Box where its shorted over a resistor.
- Igniter box continues to the rocket motor.