How does the ATV320 JOG function work when using 3-wire control?

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The typical 3-wire control is used when momentary inputs provide the Start/Stop control.
DI1 from the STOP contact is normally high to allow a run command.
DI2 is from the START contact and puts the VFD into run status when it goes high, even momentarily.

Add the JOG function by assigning it to another digital input, DIx. When DIx is low, normal 3-wire action per above is in control. When DIx is high, the JOG function is active and the Jog frequency, JGF, becomes the reference speed. In JOG, the VFD will run only when DI2 is high and will stop if DI2 drops low. The JOG action results from DI2 going high and low. So the sequence is to have DI1 and DIx go high and then use DI2 for jogging the motor.

The same logic applies to a reverse logic input, such as DI3.

To program this:
Go to ConF=>Full =>I_O and set tCC to 3C for 3 wire control. This automatically assigns DI1/LI1 to Stop andDI2/LI2 to Fwd.
To start DI1 has to be on, and a momentary closure of DI2 is needed to begin running the motor.

The speed the drive will run at is dependent on the assigned Frequency Reference, preset speed inputs, Jog, or other programming in the drive.

To assign an input to the Jog function Go to Conf => Full => Fun => Jog and select any unused input (DI3/LI3 is shown in the manual)

If the Jog input is turned on while the drive is running, the Jog Frequency (JGF) will become the commanded frequency for the motor.
JGF is adjustable between 0 and 10 Hz.
It is also possible to program Jog Delay (JGt) to set a minimum amount of time between Jog operations.
JGt is adjustable between 0 and 2 seconds

NOTE: When jogging the ACC and DEC ramp times are forced to 0.1 seconds. If this is not acceptable, or if a jog frequency of greater than 10 Hz is required, consider using a preset speed instead.