Evidence to watch
The function is proved by changed behavior, not by a parameter value alone.
- Jog input or control bit
- Active-reference source
- Actual frequency, current and direction
F-31 · vendor-neutral function
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.
Why it matters
The behavior behind the parameter.
Jog is useful for setup, positioning and direction checks, but it still produces torque. Its speed, direction, permissives and stop response must be commissioned rather than treated as a harmless button.
- Jog normally has its own fixed frequency.
- Jog should override the normal reference only while deliberately active.
- Releasing jog should follow the configured stop behavior.
Interactive proof
Test vfd jog mode and jog frequency 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.
- 01
Set the jog frequency below the normal minimum operating reference.
- 02
Activate jog and confirm the active reference changes to F-31.
- 03
Release jog, observe the selected stop mode and confirm normal reference returns on RUN.
Common commissioning mistakes
These errors can make a healthy drive appear faulty or create a misleading test.
- Setting jog fast enough to defeat its setup purpose.
- Allowing jog to bypass machine interlocks.
- Assuming a stopped display means torque is safely removed.
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.
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-22VFD 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 S-01VFD Safe Torque Off (STO)
Safe torque off prevents the drive from generating motor torque when its safety channels are de-energized. It does not isolate mains power and does not necessarily stop a moving machine quickly.
Read and testFrom explanation to evidence