15 brands · 52 models · 210 fault codes

Stop Guessing.
Start Swapping.

VFDoctor is the drive replacement specialist. Cross-reference terminals, look up fault codes, and program your replacement VFD — all from your phone, even offline.

⚡ Launch Free App See Pro Features
15
Drive Brands
52
Models
210
Fault Codes
38
Swap Gotchas
Features
Everything you need to swap a drive. Nothing you don't.
Terminal Cross-Reference
Pick any source and target drive. Get a terminal-by-terminal mapping showing direct matches, approximate matches, and what needs manual attention. Parameter hints included.
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Fault Code Lookup
210 fault codes across 15 brands. Search by code, name, or description. Each entry explains likely causes and step-by-step remedies. Built for 2am troubleshooting.
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Motor Nameplate Calculator
Enter the motor nameplate data, select your drive. Get the exact parameter numbers and values to program — in that drive's specific language. Flags common mistakes.
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Swap Gotchas
38 rules that fire automatically when you select a drive combination. STO jumpers, missing 24V supplies, analog input quirks, shared commons — the stuff that trips people up.
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Wire Tracker
Log every wire with color code, source terminal, and auto-mapped target terminal. Document the swap as you go. Never lose track of where a wire came from.
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Parameter Checklist
Model-specific parameter lists with priority badges, progress tracking, and a printable checklist with signature lines. Hand it to QA when you're done.
From dead drive to running motor in minutes.
A drive just died on a packaging line that runs $5,000/hour. The distributor has a different brand in stock. Here's what happens next.
1
Cross-Reference
Select old and new drive. See every terminal mapped with match quality.
2
Check Gotchas
Automatic warnings for STO jumpers, missing 24V, analog quirks.
3
Wire & Track
Move wires one at a time, logging each in the Wire Tracker.
4
Program & Run
Motor calc gives exact params. Checklist confirms everything. Start the line.
Pricing
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Cross-Reference tab
Allen-Bradley PowerFlex
Yaskawa
Siemens
ABB
11 more brands (52 models)
Fault Code Lookup
Motor Calculator
Wire Tracker
Parameter Checklist
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Pro
$39.99
per year — or $4.99/month
Everything in Free
All 15 brands, 52 models
210 Fault Codes with remedies
Motor Nameplate Calculator
Wire Tracker with color coding
Parameter Checklist with print
38 Swap Gotcha warnings
Works offline (PWA)
All future updates included
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Supported Drive Brands
Allen-Bradley PowerFlex ★ FREE Yaskawa ★ FREE Siemens ★ FREE ABB ★ FREE Mitsubishi Electric AutomationDirect Danfoss Schneider Electric WEG Eaton Delta Electronics Galt Electric Toshiba Leeson / IRONHORSE Fuji Electric