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VFD Fault Rules

Variable frequency drive fault detection rules (VFD-*). Source grounding: HVAC FDD Reference v1.0 ch.15, PNNL VFD O&M guidance, NIST’s generic faulty-regulation work, and verified library hunting precedents (see each card’s Deviations section). Application-agnostic: the same five rules serve fan, pump, and other process drives, with the process-variable pair bound per application.

Point dictionary: points/vfd.points.json.

Index

IDNameSevMethodStatus
VFD-0001Command vs feedback deviation2ruleverified
VFD-0002At minimum speed with load unsatisfied3ruleverified
VFD-0003At maximum speed with load unsatisfied3ruleverified
VFD-0004VFD process-loop hunting3ruleverified
VFD-0005VFD not in remote automatic control2ruleverified

VFD-0001/0002 severity and method follow the reference’s ch.15 cards. The three library-authored expansion rules classify their adopted thresholds and source adaptations on-card.

Relationships

  • All five rules share the vfd-pump-faults playbook.
  • VFD-0001 suppresses the speed-limit and hunting rules when speed feedback is not trustworthy. VFD-0005 suppresses those same-drive automatic-loop rules while remote automatic authority is absent.
  • No drive-control cluster is declared: mode, tracking, capacity, and tuning findings are peer symptoms without one causal trigger whose correction should clear the rest.