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I am an electrical engineering student leading the electrical design for a mini tunnel boring machine (0.5m diameter). We are building an industrial control panel to drive a 12.3HP Cutterhead (480V) and a 0.25HP Auger (120V).
The Stack:
Logic: Teensy 4.1 (Communicating with Raspberry Pi via Ethernet).
Safety: Omron G9SE Safety Relay triggering a 24V Global E-Stop bus.
Power: 480V 3-Phase input -> VFD -> Motor.
Watchdog: Hardware watchdog (TPL5110) cutting the safety chain if the MCU hangs.
My Specific Questions:
Safety Chain: Does my "Global E-Stop" architecture (cutting 24V to contactor coils) look robust enough for a student competition?
Isolation: Any specific advice on isolating the 210VAC motor noise from the 24V control circuit?
Watchdog: I am using a hardware and software watchdog to cut the 24V safety line. Is there a standard industrial way to do this better?
Notes: I could probably use only one safety relay for both motor circuits?, Hardware Watchdog not added to schematic yet.
Any feedback is appreciated!
The Stack:
Logic: Teensy 4.1 (Communicating with Raspberry Pi via Ethernet).
Safety: Omron G9SE Safety Relay triggering a 24V Global E-Stop bus.
Power: 480V 3-Phase input -> VFD -> Motor.
Watchdog: Hardware watchdog (TPL5110) cutting the safety chain if the MCU hangs.
My Specific Questions:
Safety Chain: Does my "Global E-Stop" architecture (cutting 24V to contactor coils) look robust enough for a student competition?
Isolation: Any specific advice on isolating the 210VAC motor noise from the 24V control circuit?
Watchdog: I am using a hardware and software watchdog to cut the 24V safety line. Is there a standard industrial way to do this better?
Notes: I could probably use only one safety relay for both motor circuits?, Hardware Watchdog not added to schematic yet.
Any feedback is appreciated!
