Variable Frequency Drive (VFD) Maintenance Checklist

VFD preventive maintenance checklist for variable frequency drives to check cooling, capacitors, terminal torque, parameters, and fault history.

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Variable Frequency Drive (VFD) Maintenance Checklist



Drive Identification And Service History

1. Drive make, model, and power rating


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2. Asset or tag number and the driven equipment it controls


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3. Date the cooling fans and DC bus capacitors were last replaced


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4. Defects raised at the previous PM visit have been closed out


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Isolation And Stored Energy

1. Isolation is carried out under the site electrical safety procedure and locked off


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2. Arc flash PPE appropriate to the incident energy at this panel is worn


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3. The manufacturer's discharge time has elapsed before any cover is removed


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4. DC bus voltage is measured and confirmed at zero before any terminal is touched


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5. The supply is proved dead at the drive input terminals


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Operating Environment And Enclosure

1. Ambient temperature at the drive is within the manufacturer's rated range


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2. No condensation, water ingress, or staining is present inside the enclosure


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3. The drive is free of conductive dust, metal filings, and oil film


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4. No corrosive gas exposure or chemical residue is evident on boards or terminals


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5. Enclosure seals, gaskets, and gland plates are intact and correctly fitted


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Cooling

1. Heatsink fins are clear of dust and lint across their full depth


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2. Cooling fans run freely at full speed with no bearing noise or wobble


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3. Drive and enclosure air filters are clean and unrestricted


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4. Clearance above, below, and around the drive meets the manufacturer's specification


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5. The reported heatsink or internal temperature is within its normal operating band


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Internal Condition

1. DC bus capacitors show no bulging, venting, or electrolyte leakage


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2. Capacitor service hours or age are within the manufacturer's rated life


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3. Circuit boards are free of discoloration, cracked components, and swelling


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4. Busbars and internal connections show no heat discoloration or arcing marks


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5. No insects, nesting, or foreign objects are present inside the drive


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Power And Control Terminations

1. Input and output power terminals are torqued to the manufacturer's specification


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2. Control terminal connections are secure with no strand damage or loose cores


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3. Protective earth and bonding connections are continuous and tight


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4. The shielded motor cable screen is terminated at the gland with full circumferential contact


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5. Control cabling is routed separately from power cabling with no shared trunking


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Motor Cable And Insulation Testing

1. The drive is disconnected from the motor cable before any insulation test is applied


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2. Insulation resistance of the motor cable and windings is measured and recorded


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3. Motor cable length is within the drive's stated maximum for the switching frequency in use


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4. Motor cable, glands, and terminations are free of damage, chafing, and moisture


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Parameters And Diagnostics

1. The active parameter set matches the documented record for this drive


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2. A current parameter backup is taken and stored with the equipment records


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3. The installed firmware version is recorded and checked against the manufacturer's current release


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4. The fault log is reviewed and recurring fault codes are recorded


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5. No unexplained changes to protection or speed limit parameters are present


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Operational Verification

1. Input voltage is balanced across phases and within the drive's rated range


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2. Output current is balanced across phases and within the motor's rated value


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3. DC bus voltage is stable at the expected level under load


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4. The drive runs through its full speed range without tripping or instability


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5. Overload, phase loss, and thermal protection functions are enabled and set correctly


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6. No abnormal noise, vibration, or audible whine is present at the drive under load


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Checklist by GoAudits.com – Please note that this checklist is intended as an example. We do not guarantee compliance with the laws applicable to your territory or industry. You should seek professional advice to determine how this checklist should be adapted to your workplace or jurisdiction.

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