Power Electronics, Motors & Drives worked example

Drive Test Time at 7.2% setup and retest allowance: a worked example

This worked example runs the drive test time numbers for a tougher week than the baseline: 7.2% setup and retest allowance instead of the typical 10%. Estimate total test time for VFDs, servo drives, inverters, or converters from unit count, test rate, and retest or setup allowance.

The inputs for this scenario

  • Drives to test: 120 drives (held at the documented default)
  • Drive test completion rate: 12 drives / min (held at the documented default)
  • Setup and retest allowance: 7.2 % (the input this scenario stresses; the baseline uses 10)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base drive test time = drives to test รท drive test completion rate.
  • Required drive test time works out to 10.72 min at these inputs, and this is the headline figure for the scenario.
  • Base drive test time works out to 10 min at these inputs.
  • Drive test allowance applied works out to 7.2 % at these inputs.
  • Drive test completion rate works out to 12 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where setup and retest allowance sits at 10% and the headline result is 11 min, this scenario comes in 2.55% below the baseline at 10.72 min.
  • Use it when sizing test-station capacity, scheduling functional or burn-in test, or costing the test step of a drive build. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Required drive test time: 10.72 min (headline result)
  • Base drive test time: 10 min
  • Drive test allowance applied: 7.2 %
  • Drive test completion rate: 12 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Drive Test Time calculator, set setup and retest allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.