AUWiring

Motors calculators

Check motor current, nameplate, overload, starting-current, starting-time and voltage-dip values against the project supply and equipment data.

  • 9 calculators
  • Australian workflow
  • 230/400 V a.c. context

Motors calculators project basis

Check motor current, nameplate, overload, starting-current, starting-time and voltage-dip values against the project supply and equipment data. These calculators support Australian design, estimating, installation and verification preparation. Keep the circuit, equipment, route, supply arrangement and source data with the result before it is used in a project record.

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Confirm the nominal 230/400 V a.c. or project-specific voltage basis, 50 Hz context where applicable, phase arrangement, metric units, manufacturer information, DNSP or authority conditions and current project documents before applying a result.

Check entered values, supply arrangement, cable or equipment data, product limits, DNSP or authority conditions and review limits before using the result.

Records covered

  • Full-load currentEstimate motor FLC from nameplate or design values. Inputs: kW, voltage, phase, power factor and efficiency. Output: Current estimate to compare with nameplate and product data.
  • Nameplate comparisonCompare calculated motor current with entered nameplate current and tolerance. Inputs: Calculated current, nameplate current, entered tolerance and optional review current. Output: Nameplate comparison record that keeps manufacturer data stronger than the formula basis.
  • Overload setting worksheetEstimate an overload worksheet value from entered motor current and setting assumptions. Inputs: Full-load current, service factor, setting percent, optional device range and review setting. Output: Entered-data overload worksheet, not device selection or manufacturer setting replacement.
  • Efficiency loadEstimate shaft output, losses and load percentage from input power or measured current. Inputs: Input basis, voltage, current or input kW, power factor, efficiency and rated output. Output: Motor load and loss record with optional entered load comparison.
  • Starting currentEstimate starting current using selected starting method multipliers. Inputs: FLC and DOL, star-delta or drive-related multiplier assumptions. Output: Starting-current estimate for voltage-dip and protection review.
  • Star-delta starting currentEstimate star current and transition current from entered DOL current and starter ratios. Inputs: DOL current, line voltage, star current ratio, optional transition ratio and review current. Output: Star-delta current record for starter, voltage-dip or supply review.

Review before applying

Motors calculator results are preparation records. Keep entered values beside current Australian requirements, DNSP or authority conditions, manufacturer information and project documents before applying a result.

Recheck the selected calculator whenever the supply arrangement, equipment data, route length, tariff basis, measurement method or project document set changes.