Appliance Electronics & Control Boards worked example

Control Board Production Ramp Planner at 90% expected ramp uptime: a worked example

What does the result look like when expected ramp uptime reaches 90%? The full calculation is worked below with real intermediate numbers. a program or production manager needs a practical capacity estimate for an appliance electronics ramp

The inputs for this scenario

  • Boards completed per ramp cycle: 5 boards/cycle (unchanged)
  • Planned ramp production cycles: 420 cycles (unchanged)
  • Expected ramp uptime: 90 % (raised for this scenario; the documented default is 78)
  • Expected launch good-board yield: 90 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross ramp board capacity = boards completed per ramp cycle × planned ramp production cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,701 boards for expected good boards during ramp, the number this scenario is built around.
  • At this operating point the engine returns 2,100 boards for gross ramp board capacity.
  • At this operating point the engine returns 210 boards for boards lost to ramp downtime.
  • At this operating point the engine returns 189 boards for boards lost to launch yield loss.

How this compares with the baseline

  • Against the tool's baseline example, where expected ramp uptime sits at 78% and the headline result is 1,474 boards, this scenario comes in 15.38% above the baseline at 1,701 boards.
  • A figure at this level is achievable when expected ramp uptime is genuinely sustained, not just peaked for a shift. It models a single average ramp condition; real ramps improve cycle to cycle, so a single uptime and yield pair understates output late in the ramp and overstates it early.

Results at a glance

  • Expected good boards during ramp: 1,701 boards (headline result)
  • Gross ramp board capacity: 2,100 boards
  • Boards lost to ramp downtime: 210 boards
  • Boards lost to launch yield loss: 189 boards

Run it with your numbers

  • Every input above is editable in the live Control Board Production Ramp Planner calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.