{
  "node": {
    "id": "term:emergency-shutdown",
    "type": "Term",
    "label": "Emergency shutdown",
    "properties": {
      "id": "emergency-shutdown",
      "name": "Emergency shutdown",
      "abbr": "ESD",
      "aka": [
        "emergency stop",
        "E-stop"
      ],
      "section": "topic-hvsafety",
      "definition": "A hard-wired path that takes a battery system to a safe state on command, opening contactors and stopping the power converters regardless of what the software is doing. Stationary systems have red push buttons on the enclosure and often remotely; in vehicles the crash signal and the manual service disconnect play the same role.",
      "related": [
        "contactor",
        "pyrofuse",
        "high-voltage-interlock",
        "stationary-storage",
        "power-plant-controller"
      ],
      "url": "https://lemonergy.com/learn/glossary/emergency-shutdown/",
      "mentions": [
        "enclosure"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:5127",
      "source": "term:emergency-shutdown",
      "target": "topic:topic-hvsafety",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:5128",
      "source": "term:emergency-shutdown",
      "target": "term:contactor",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5129",
      "source": "term:emergency-shutdown",
      "target": "term:pyrofuse",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5130",
      "source": "term:emergency-shutdown",
      "target": "term:high-voltage-interlock",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5131",
      "source": "term:emergency-shutdown",
      "target": "term:stationary-storage",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5132",
      "source": "term:emergency-shutdown",
      "target": "term:power-plant-controller",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/emergency-shutdown/enclosure",
      "source": "term:emergency-shutdown",
      "target": "term:enclosure",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-hvsafety",
      "type": "Topic",
      "label": "High-voltage and functional safety",
      "properties": {
        "id": "topic-hvsafety",
        "name": "High-voltage and functional safety",
        "lede": "Keeping people safe from the pack’s voltage and keeping its electronics safe when they fail: insulation, switching, fusing and the functional-safety process.",
        "context": "Relate protection to faults, detection and response.",
        "example": "Normal-operation current limits do not demonstrate correct contactor behavior under a welded-contact or sensor fault.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/battery-basics/",
        "lesson_label": "Open battery basics"
      }
    },
    {
      "id": "term:contactor",
      "type": "Term",
      "label": "Contactor",
      "properties": {
        "id": "contactor",
        "name": "Contactor",
        "section": "topic-hvsafety",
        "definition": "A heavy-duty electrically operated switch that connects the pack to the vehicle or inverter and opens it on fault or shutdown. Packs use at least two, one per pole, plus a pre-charge path to avoid welding them on the first connection.",
        "related": [
          "pre-charge",
          "battery-disconnect-unit",
          "pyrofuse",
          "bms"
        ],
        "url": "https://lemonergy.com/learn/glossary/contactor/",
        "mentions": [
          "inverter"
        ]
      }
    },
    {
      "id": "term:pyrofuse",
      "type": "Term",
      "label": "Pyrofuse",
      "properties": {
        "id": "pyrofuse",
        "name": "Pyrofuse",
        "aka": [
          "pyrotechnic disconnect"
        ],
        "section": "topic-hvsafety",
        "definition": "A high-voltage disconnect fired by a small pyrotechnic charge on command, typically from the airbag controller in a crash. It cuts the pack from the vehicle in milliseconds, faster and more reliably than a contactor can open under fault current.",
        "related": [
          "fuse",
          "contactor",
          "battery-disconnect-unit",
          "high-voltage-interlock"
        ],
        "url": "https://lemonergy.com/learn/glossary/pyrofuse/",
        "mentions": []
      }
    },
    {
      "id": "term:high-voltage-interlock",
      "type": "Term",
      "label": "High-voltage interlock loop",
      "properties": {
        "id": "high-voltage-interlock",
        "name": "High-voltage interlock loop",
        "abbr": "HVIL",
        "section": "topic-hvsafety",
        "definition": "A low-voltage signal loop threaded through every high-voltage connector and cover. Opening any of them breaks the loop and the BMS drops the contactors, so a technician cannot reach a live conductor.",
        "related": [
          "contactor",
          "pack-voltage",
          "insulation-resistance",
          "functional-safety"
        ],
        "url": "https://lemonergy.com/learn/glossary/high-voltage-interlock/",
        "mentions": [
          "bms"
        ]
      }
    },
    {
      "id": "term:stationary-storage",
      "type": "Term",
      "label": "Stationary storage",
      "properties": {
        "id": "stationary-storage",
        "name": "Stationary storage",
        "abbr": "BESS",
        "aka": [
          "battery energy storage system",
          "ESS"
        ],
        "section": "topic-applications",
        "definition": "Batteries installed in a fixed place — a container at a solar farm, a cabinet in a home — to shift energy in time or support the grid. LFP cells dominate because cost per cycle and safety matter more than mass.",
        "related": [
          "lfp",
          "energy-management-system",
          "inverter",
          "energy-arbitrage",
          "long-duration-storage",
          "ul-9540a"
        ],
        "url": "https://lemonergy.com/learn/glossary/stationary-storage/",
        "mentions": []
      }
    },
    {
      "id": "term:power-plant-controller",
      "type": "Term",
      "label": "Power plant controller",
      "properties": {
        "id": "power-plant-controller",
        "name": "Power plant controller",
        "abbr": "PPC",
        "aka": [
          "battery plant controller",
          "plant controller",
          "site controller"
        ],
        "section": "topic-data",
        "definition": "The fast closed-loop controller of a grid-connected battery plant that regulates active and reactive power, voltage and frequency response at the point of connection, dispatching setpoints to the inverters. It enforces the grid code, while the energy management system above it decides the schedule.",
        "related": [
          "energy-management-system",
          "inverter",
          "stationary-storage",
          "frequency-regulation",
          "string"
        ],
        "url": "https://lemonergy.com/learn/glossary/power-plant-controller/",
        "mentions": [
          "reactive-power-support"
        ]
      }
    },
    {
      "id": "term:enclosure",
      "type": "Term",
      "label": "Enclosure",
      "properties": {
        "id": "enclosure",
        "name": "Enclosure",
        "aka": [
          "battery housing",
          "battery tray"
        ],
        "section": "topic-pack",
        "definition": "The sealed case that carries the modules, protects them in a crash, keeps water out to an IP67 rating or better and vents gas in a thermal event. In many cars it is a structural part of the body.",
        "related": [
          "pack",
          "ip-rating",
          "cell-to-chassis",
          "venting",
          "gigacasting",
          "ul-94"
        ],
        "url": "https://lemonergy.com/learn/glossary/enclosure/",
        "mentions": []
      }
    }
  ]
}