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Igniter cell interlock nuisance-trips on cold start

Closed

team@spacex.demo · 2026-07-25 · ISS-SPAX-0016

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Customer
European Space Agency
Europe · owner: casey.kim
Machine / asset
Merlin 1DMerlin 1D
serial M1D-IG-0459 · MACH-0006
DisciplineAutomation
PriorityMedium
Spares statusNone
Last updated2026-08-07 07:16

Description

Igniter cell safety interlock trips on the first start of the day when ambient is below roughly 10°C, requiring a manual reset before the campaign can begin.

Work log

Currently: Shipped3 entries
  1. CKcasey.kimShippedAug 7 · 07:16 AM

    PLC recipe updated on site and signed off by the ESA test lead.

  2. CKcasey.kimFixedAug 2 · 07:16 AM

    Threshold re-characterised across the full ambient range.

  3. CKcasey.kimReviewedJul 25 · 07:16 PM

    Reproduced on a cold morning at Kourou. Only ever the first start.

0

Resolution

Interlock threshold was calibrated at 20°C ambient. Re-characterised across the full 5–35°C range and the trip point moved into the PLC recipe so it is site-adjustable.

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