vfd ?

[mickeyrench]

when installing vfd's is a starter required by the nec ? and is it installed before or after the vfd? i was going to use the cutler hammer svx9000 since this is what is used here. i had notice that they haven't used any of the vfd type cable for the motors and was wondering if it is needed since they are all between 5-15 hp. also i don't see any filters or reactors for the vfd. thanks for any info on this subject.

[cadpoint]

In the case of VFD brand "Wires" being used that along has been in many
good threads, here. Might I suggest a good query on the subject, I suggest an advance search (http://forums.mikeholt.com/search.php).

VFD's threads have been well presented here and in great detail as to your the nature of your subject matter.

[mickeyrench]

anyone know if a starter is needed for the vfd. or maybe just overloads is enough. thank you

[bpk]

You can set your overload percentage as one of the parameters when you install the VFD. The VFD will also take the place of a starter as you can control it with a variety of start/stop/run configurations. You will still need to have a disconnect though.

[mickeyrench]

thanks for the help.

[charlietuna]

VFD's can be ordered with reactors and a built in disconnect switch and they take the place of a starter. Years ago, the manufacturers doubled the warentee if a reactor was installed before the VFD for surge protection, then they started including them with the VFD. A few manufacturers also required using their cable between the VFD and the motor, but that has disappeared.