Motor Running Current Trend Tracker
Log running current readings, see the wear trend and get a projected date when the 92 A limit will be reached.
Readings stay in your browser (localStorage) โ nothing is uploaded.
Straight-line (least-squares) extrapolation of your logged readings to the 92 A alarm threshold (warning at 85 A). A low Rยฒ means the trend is noisy โ log more readings before trusting the projection.
Field notes from maintenance practice
Always log at the same process condition (same product, speed, damper position) and the same phase. The 'free' insight is upstream of the motor: a pump current creeping up at fixed flow means wear-ring leakage; a conveyor creeping up at fixed throughput means dragging idlers or misalignment. The motor is your power meter for the whole train. The default action limit of 92 A comes from a typical 90 kW motor's nameplate FLA (~92 A at 400 V) โ set the alarm to YOUR motor's nameplate full-load amps and the warning ~8% below; adjust it if your OEM or procedure specifies otherwise.
Linear extrapolation is honest only when the Rยฒ is decent (โฅ 0.7) and degradation is steady. Current rises with mechanical load and with motor degradation, so a creeping ampere trend at constant process duty is telling you friction is being added somewhere downstream โ or the motor itself is losing efficiency. If the last reading jumps far off the line, re-measure before believing it โ measurement technique drifts too.
Sources & references
- NEMA MG-1 โ motors and generators (service factor, FLA)
- EASA AR100 โ recommended practice for the repair of rotating electrical apparatus
Trend screening only โ confirm with a proper inspection before running equipment to a projected limit.
Motor Running Current Trend Tracker for maintenance and reliability teams: Log running current readings, see the wear trend and get a projected date when the 92 A limit will be reached. Free, private (everything runs in your browser) and ready for daily plant use.
About Motor Running Current Trend Tracker
This tracker is a remaining-useful-life (RUL) estimator for running current. Log a dated reading whenever you measure; the tool fits a least-squares straight line through your history and projects when it will cross the 92 A action limit (warning at 85 A) โ turning scattered measurements into a forecast date you can plan parts and downtime around.
How to use Motor Running Current Trend Tracker
- 1Enter each dated measurement as you take it โ readings persist in your browser between visits.
- 2Adjust the alarm (and warning) threshold to your OEM or procedure limit if it differs from the default.
- 3Read the fitted trend, Rยฒ, days-to-alarm and the projected date โ then plan parts and downtime around that date.
Why use Motor Running Current Trend Tracker?
- โLog running current readings, see the wear trend and get a projected date when the 92 A limit will be reached โ computed instantly with the standard formula
- โ100% free and unlimited, with no sign-up, login or paywall
- โRuns entirely in your browser โ readings and asset data never leave your device
- โNiche-specific defaults and thresholds for running current, traceable to the cited standards
Frequently asked questions
What limit should trigger action for running current?+
The widely used limit is 92 A (a typical 90 kW motor's nameplate FLA (~92 A at 400 V) โ set the alarm to YOUR motor's nameplate full-load amps and the warning ~8% below). Set a warning at 85 A so parts and labour are ready before the alarm. Your OEM manual or internal procedure overrides the generic figure.
Motor current is below nameplate but rising 1% a month โ act or wait?+
Investigate now while it's cheap. A steady rise at fixed duty is added friction or load: check downstream (bearings, belt tension, product build-up, gearbox) with an IR gun for hot spots, compare all three phases (one phase rising alone is electrical), and trend kW if you can โ kW separates real load from power-factor drift better than amps.
How many readings before the projection is trustworthy?+
At least 4โ6 spread over a meaningful fraction of the asset's life, with a fit Rยฒ of about 0.7 or better. Two points always make a perfect line โ that is curve fitting, not condition monitoring. Keep measurement conditions (load, temperature, location) consistent.
Is straight-line extrapolation valid for wear?+
It is the standard first approximation for steady-state degradation, and it is deliberately conservative to act on. Many failure modes accelerate near the end (bathtub curve), so treat the projected date as the latest acceptable intervention date, not a promise.
Where is my logged data stored?+
Entirely in your browser's localStorage on this device โ nothing is uploaded to any server. Export or note critical values elsewhere if you need a permanent maintenance record shared across a team.
Embed Motor Running Current Trend Tracker on your website
Want Motor Running Current Trend Trackeron your own site? Paste this snippet into any HTML page โ it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/motor-current-trend-tracker" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Motor Running Current Trend Tracker โ ToolJolt" loading="lazy"></iframe>Related tools
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