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Replacing motors with premium efficiency units and VFDs, motor sizing, speed and slip, generator diesel consumption and autonomy, UPS and battery banks.
Compare the current motor, a NEMA Premium/IE4 motor and a variable frequency drive for pumps and fans with flow profile, rewinds and payback. Based on NEMA MG 1, IEC 60034-30-1 and DOE 10 CFR 431.
NEMA Premium, IE4, VFD, load profile, paybackChoose the induction motor from the load, drive, duty cycle, altitude and temperature, check across-the-line, star-delta, soft starter or VFD starting and see current and voltage dip.
Power, duty, starting, currentCompute synchronous speed (120 · f ÷ poles), slip, actual speed under load, speed on a variable frequency drive with V/Hz control, the frequency for a target speed and machine speed through sheaves.
rpm, poles, VFD, sheavesEstimate generator diesel use from the load profile, with the maker’s curve or the published linear model, tank run time, the tank needed for the hours required and the cost per hour and per kWh.
Fuel, run time, tank sizeCompute UPS runtime from load, inverter efficiency and lead-acid battery bank, with Peukert, temperature, end voltage and aging, plus the capacity needed for the target backup time.
Runtime, Ah, PeukertSet the overload relay from full-load current and service factor (0.58 × FLA on wye-delta), check the trip class against starting and stall times, and size the NEC 430.52 fuse or breaker, contactor and conductors.
Overload, trip class, fuseSize a capacitor at the motor terminals: kvar for the target power factor, 90% of no-load reactive power self-excitation limit, typical table by size and poles, reduced current and the new overload setting.
kvar, self-excitation, relayPaste internal resistance, impedance or conductance readings by cell and get each deviation from commissioning baseline or string average, cells on watch or to replace, and the trend across readings.
mΩ, impedance, conductanceClassify vibration of motors, pumps and fans into ISO 20816-3 and ISO 10816-1 zones A, B, C and D, convert displacement, velocity and acceleration, and project when the trend reaches the alarm.
ISO 20816, in/s RMS, zones A to DImportant notice: Indus Metrics tools produce estimates and pre-sizing results from the data you enter and from published engineering methods. They do not replace design, calculations or reports signed by a licensed professional engineer (PE), nor verification against the applicable codes, standards and regulations, such as OSHA rules and the ASME codes. Material and fuel properties vary: check manufacturer data or your own process analyses before deciding. By using this site you agree to the Terms of Use.
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