Load weight in pounds - determine if any dead weights adds to the load (such as chain or belts).

All of the moving mass should be included to calculate the inertia.
Dead weight and non-load weight that is moving linearly.
The traveling velocity of the load in feet per minute.

To calculate the velocity based on wheel, drum, sprocket pitch diameter and rotational speed ( rpm ) see "Linear velocity" Calculation.
The motor speed under full-load conditions.
( Full-load means listed nominal power )

For values see the motor section of the catalog.
Inertia of Linear Movement Reflected to Input
Variables   Units
W Load weight lb
WD Dead weight lb
v Linear velocity fpm
nM Motor full load speed rpm
JX Load inertia lb-ft2