Emergency Shutdown

Emergency shutdown provides operator and automated safety system ability to rapidly transition charging and associated hazards to a safe state — removing power from resonant tank, disabling vehicle motion enable, and signaling fleet management that the zone is unsafe. SiCore docks interface with facility mushroom E-stops, AGV-mounted safety PLCs, light curtain outputs, and fire alarm interlocks common in warehouse installations.

Response must be deterministic: hardware paths disable gate drivers independently of software load; software confirms shutdown and holds safe state until qualified reset — preventing automatic restart into occupied fault zones after E-stop release.

01Shutdown paths and timing

• Category 0/1 stop alignment: remove motive power to inverter within defined ms via redundant disable circuits.
• E-stop chain: series-connected NC contacts cutting safety relay coil — broken wire fails safe.
• Safe state definition: zero intentional WPT field, discharged tank within bleed time, interlock latched.
• AGV STO output: dock asserts charge-prohibit and STO-coordinated signals to vehicle safety controller.
• Visual indication: pad status LED and optional horn confirm shutdown state to approaching operators.

02System coordination

Multi-pad aisles define whether E-stop affects single pad, bay, or entire charger line — SiCore supports grouped zones with configurable logic documented in site safety file. Fire alarm integration typically inhibits new charge starts and ramps down active sessions rather than instantaneous dump — balancing fire spread prevention from energized equipment against battery stress from abrupt load removal, per customer fire marshal agreement.

Receiver behavior on dock E-stop: cease rectifier switching, open output contactor if fitted, and report fault code on surviving communication link. Vehicle may retain battery energy but cannot accept charge until reset sequence completes — including visual inspection of pad and confirmation from fleet supervisor console.

03Reset and recovery

Reset requires deliberate action: twist-release E-stop, key switch, or authenticated fleet command — not mere fault clearance. SiCore reset sequence verifies FOD clear, LOD zone clear, thermal limits normal, and no active hardware fault before arming inverter. Post-incident review captures E-stop source, shutdown latency from scope measurement during commissioning baseline, and any override used — supporting continuous improvement of site safety procedures and SiCore interface documentation.