VR2R-0499_r1

VR2R-0499

① SA Source

• Source: 開啟完整 SA 文章
• Section: Rack Level Infrastructure: Power Delivery
• Line hint: 412

Context Before

For the VR NVL72 reference design, the power delivery infrastructure at the rack level includes four 110kW power shelves. The VR NVL72 system has a TDP up to 220kW for the 2300W Rubin TDP SKU. The design with four 110kW power shelves is an N+1 redundancy approach. Each 110kW power shelf is 3U tall and includes six 18.3kW PSU with built in capacitors in the PSU. Each power shelf receives three phase 415VAC-480VAC of power from two 100A whips.

Evidence

The power shelves step down the power from 415VAC-480VAC to 50VDC and sends it to the busbar.

Context After

Interestingly, the busbar of VR NVL72 is rated for 5000A+, which is much higher than that of Grace Blackwell at 2900A. Given the extremely high current and the lack of fans in the rack, the busbar has to be liquid cooled.

② Atomic Claim

power shelves 將 415VAC–480VAC 降壓為 50VDC，並送到 busbar。

• Epistemic Mode: ASSERTED
• Mapping Status: COMPLETE

③ Semantic Frame

{
  "additional_nodes": [],
  "frame_type": "RELATION",
  "object": {
    "id": "04_knowledge_base/Busbar",
    "label": "busbar"
  },
  "predicate": "STEPS_AC_DOWN_TO_50VDC_AND_FEEDS",
  "qualifiers": {
    "condition_text": null,
    "numeric_mentions": [
      "415VAC",
      "480VAC",
      "50VDC"
    ],
    "temporal_mentions": []
  },
  "subject": {
    "id": "04_knowledge_base/Datacenter power shelf",
    "label": "power shelf"
  }
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
subject	power shelf	04_knowledge_base/Datacenter power shelf
object	busbar	Busbar

⑤ Human Review

請在 Properties 逐項確認：

• 原文 → Atomic Claim 是否忠實
• Atomic Claim → Semantic Frame 是否忠實
• Canonical Entity mapping 是否正確
• Epistemic mode 是否保留原文語氣
• 最後選擇 review_action

Review state

Markdown 內文不是正式 approval。只有 Apply bridge 寫入的 Decision Ledger event 才是正式決策。