PLC Simulator
F-61–F-63 · vendor-neutral function

VFD Preset Speeds

Preset speeds are stored frequency references selected by digital inputs or control bits. They provide repeatable operating points without an analog signal.

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Why it matters

The behavior behind the parameter.

Preset speeds suit machines with a few defined rates, recipes or setup modes. The important commissioning work is proving the selection truth table, priority and transition behavior—not only entering three numbers.

  • The selected preset becomes the active reference.
  • Input combinations can select more presets than a single bit.
  • Jog, limits and stop commands can override a preset.

Interactive proof

Test vfd preset speeds in three passes.

Keep the motor, load and starting condition constant. Change one function at a time, then use the electrical and mechanical evidence to explain the result.

  1. 01

    Enter low, normal and high preset frequencies.

  2. 02

    Select P1, P2 and P3 while running and compare commanded and actual speed.

  3. 03

    Activate jog, then stop, to prove the intended priority over preset selection.

Load F-code F-61–F-63 in the function lab

Evidence to watch

The function is proved by changed behavior, not by a parameter value alone.

  • Preset-selection bits
  • Active preset number
  • Limited reference and at-speed status

Common commissioning mistakes

These errors can make a healthy drive appear faulty or create a misleading test.

  • Documenting values but not the selection truth table.
  • Allowing a high preset in a setup mode.
  • Changing presets without proving acceleration and deceleration behavior.

Primary technical references

Transfer the concept; verify the exact drive.

This guide uses vendor-neutral terminology. For real equipment, use the manual for the installed model, option cards and firmware, plus the machine risk assessment and approved commissioning procedure.

Rockwell PowerFlex 520-series user manualSiemens SINAMICS G120 function manualDanfoss VLT AutomationDrive programming guideABB ACS580 manual directory

Related VFD functions

F-23

VFD Speed Reference Sources

The speed reference is the requested output frequency or process demand. It can come from the keypad, 0–10 V, 4–20 mA, preset speeds, a motorized potentiometer, PID output or a fieldbus word.

Read and test F-31

VFD Jog Mode and Jog Frequency

Jog is a deliberate low-speed command that temporarily overrides the normal speed reference while the jog input or keypad command is active.

Read and test F-22

VFD Stop Modes: Ramp, Coast, Quick Stop and DC Brake

A VFD can ramp the frequency down, remove torque and coast, use a faster quick-stop ramp, or apply DC injection braking. Each produces a different current, torque, stopping time and DC-bus response.

Read and test

From explanation to evidence

Change the function and watch the motor respond.

Open the VFD function lab