I'm joining this conversation a little late so I hope no none minds if I throw my 2 cents in.
Keeping your motor lead length as short as possible is always preferred but you can get away with long lengths if you do it right.
1. Turn your carrier frequency down as low as possible. (This reduces the severity of the reflected wave)
2. Use high quality low capacitance, shielded VFD cable. (This further reduces the reflected wave issues and reduces high charging currents on start up.)
3. Spec your motor to have the highest voltage rated insulation you can get. (Even if there is some reflected wave happening the better insulation can withstand it better.)
4. If your VFD has a parameter that helps reduce reflected waves, turn it on. (In AB drives the software drops pulses to help break up refled waves.)
Check out these links, I've found them to be useful and informative.
https://literature.rockwellautomation.com/idc/groups/literature/documents/in/drives-in001_-en-p.pdf
https://literature.rockwellautomation.com/idc/groups/literature/documents/wp/drives-wp019_-en-p.pdf
Keeping your motor lead length as short as possible is always preferred but you can get away with long lengths if you do it right.
1. Turn your carrier frequency down as low as possible. (This reduces the severity of the reflected wave)
2. Use high quality low capacitance, shielded VFD cable. (This further reduces the reflected wave issues and reduces high charging currents on start up.)
3. Spec your motor to have the highest voltage rated insulation you can get. (Even if there is some reflected wave happening the better insulation can withstand it better.)
4. If your VFD has a parameter that helps reduce reflected waves, turn it on. (In AB drives the software drops pulses to help break up refled waves.)
Check out these links, I've found them to be useful and informative.
https://literature.rockwellautomation.com/idc/groups/literature/documents/in/drives-in001_-en-p.pdf
https://literature.rockwellautomation.com/idc/groups/literature/documents/wp/drives-wp019_-en-p.pdf