Checklists by equipment
2 lists · 11 items · 13 photosVariable frequency drive (VFD) maintenance checklists
Variable frequency drive (VFD) maintenance checklists for the quarterly and annual rounds: 2 free lists, 11 items and 13 photo requirements, each item naming what to look for and the photo that proves it. Work is commonly verified against NEC (NFPA 70); the edition in force is the AHJ's call on each project.
The variable frequency drive (VFD) rounds
Variable frequency drive (VFD) QuarterlyVariable frequency drive (VFD) quarterly maintenance checklistCooling fans, filters, enclosure temperature and the fault log checked on the quarterly round5 items5 photosVariable frequency drive (VFD) AnnualVariable frequency drive (VFD) annual maintenance checklistDe-energized pass for terminal torque, heatsink cleaning, parameter backup and bus-capacitor condition6 items8 photos
Where each walk sits in the schedule
- Variable frequency drive (VFD) quarterly maintenance checklistquarterly
- Every quarter, usually walked with the motors and starters it feeds in the same mechanical room or MCC lineup. Run by: The controls or electrical tech on the quarterly round, working at the drive without opening the power section.
- Variable frequency drive (VFD) annual maintenance checklistannual
- Once a year during a scheduled outage, when the driven load can be down long enough to open the power section safely. Run by: The electrical service tech on the annual shutdown, with the drive locked out and the DC bus confirmed discharged.
What most often fails on a variable frequency drive (VFD)
- Cooling fan seized or turning slow and nobody notices until the drive trips on overtemperature during the first hot spell.
- Intake filter caked so the drive is pulling its cooling air through a blanket of dust.
- Fault log never read, so intermittent trips clear themselves and the pattern is lost before the annual.
- Terminals never re-torqued because opening the drive means dropping the load, so a slowly creeping lug keeps cooking until it lets go.
- Parameter set living only inside the drive, so a board swap after a failure means rebuilding the configuration from memory.
- Aging electrolytic bus capacitors ignored on an older drive until it fails outright instead of being planned for replacement.
Verified against
Families only, never clause numbers. Adoption varies by jurisdiction; confirm the edition your authority having jurisdiction enforces before you run a walk against it.
Common questions
- Which variable frequency drive (VFD) maintenance rounds do these checklists cover?
- Variable frequency drive (VFD) quarterly maintenance checklist (quarterly): Every quarter, usually walked with the motors and starters it feeds in the same mechanical room or MCC lineup. Variable frequency drive (VFD) annual maintenance checklist (annual): Once a year during a scheduled outage, when the driven load can be down long enough to open the power section safely.
- Who runs the variable frequency drive (VFD) maintenance round?
- The controls or electrical tech on the quarterly round, working at the drive without opening the power section. The electrical service tech on the annual shutdown, with the drive locked out and the DC bus confirmed discharged.
- What most often fails on a variable frequency drive (VFD)?
- Cooling fan seized or turning slow and nobody notices until the drive trips on overtemperature during the first hot spell. Intake filter caked so the drive is pulling its cooling air through a blanket of dust. Fault log never read, so intermittent trips clear themselves and the pattern is lost before the annual. Terminals never re-torqued because opening the drive means dropping the load, so a slowly creeping lug keeps cooking until it lets go.
- Which standards is variable frequency drive (VFD) work verified against?
- NEC (NFPA 70), published by the National Fire Protection Association. Adoption varies by jurisdiction. Confirm the edition your authority having jurisdiction enforces before you run a walk against it.
- Can I run these checklists in RTI?
- Yes. Start a free RTI workspace and load any of the 2 lists (11 items in total). The Photo Gate holds the submit button until every mandatory item is answered and its photos are attached, and approved inspections roll into a branded turnover package with a tamper-evident audit trail.