Motor starting current workflow
How to prepare full-load current and starting-method assumptions before using the Australian motor starting current calculator.
Starting-current purpose
Starting current is often much higher than running current. A transparent worksheet helps show which full-load current and multiplier were used before a voltage-dip, generator or protection question is reviewed.
The useful output is not a final starter selection. It is a documented starting-current estimate and its assumptions.
Workflow
- Confirm the full-load current source: nameplate, schedule, calculated estimate or measured record.
- Choose a starting method or multiplier that matches the worksheet assumption.
- Calculate starting current.
- Record whether the multiplier is generic, project-specified or manufacturer-derived.
- Carry the result into voltage-dip, generator or protection review with the assumption source attached.
Starting record
| Field | Record | Review concern |
|---|---|---|
| FLC source | Nameplate, calculated, schedule or measured | Weak source weakens the result |
| Starting method | Direct-on-line, soft starter, VSD bypass or other documented method | Current depends on method |
| Multiplier | Entered multiple of FLC | Must be labelled as assumption or product data |
| Starting current | Calculated A value | Feeds dip, generator and protection review |
| Product source | Starter or drive data where used | Required before product-specific conclusions |
Boundaries
- Do not hide the starting multiplier source.
- Do not infer starting torque, acceleration or protection behaviour from current alone.
- Do not treat generic multipliers as manufacturer data.
- Do not move the result into generator sizing without also checking running loads and voltage behaviour.