Thread: VFD for my vintage AEI 3 phase motor (running a Dyco Superfine 12" table saw)

Either one will work. Go for the 2.2kW version. A 10A plug will be fine.
To connect in delta, remove the (dodgy) bridge and replace it with three vertical bridges. You would need to put a meter on the windings and make sure they are wired to suit the 3 straight bridges first of course. A bit of insulated wire with a lug on either end would be a better bridge than whats there.

Originally Posted by campidelli

...to plug the VFD to the wall socket, I need a 15A plug or can use the regular 10A?

I think 2.4kW is the limit for a 10amp plug, so you may get away with it. However start loads will exceed 10amps briefly - and if the "briefly" is too long it will blow your fuse/circuit breaker.
The beauty of a VFD is you can set them for a soft start and thereby reduce the start load.

You may find you need a much higher rated VFD to allow for motor loads - but I'm no expert on this - so hopefully someone who is will be along soon.

Cheers, Vann.

Originally Posted by NCArcher

Either one will work. Go for the 2.2kW version. A 10A plug will be fine.
To connect in delta, remove the (dodgy) bridge and replace it with three vertical bridges. You would need to put a meter on the windings and make sure they are wired to suit the 3 straight bridges first of course. A bit of insulated wire with a lug on either end would be a better bridge than whats there.

Thanks for the reply! I am going to change it to Delta and get the 2.2kW 1 220v IN to 3 220v OUT then.

Do I need to put a circuit breaker before the VFD? If so, which one do you recommmend?

Thanks!

Ordinarily because of the high start up currents a 15A Socket with dedicated 15A breaker would be needed for a 2.2kW motor
BUT
If you use VFD you can program it to "slow start" so the currents don't exceed 10A so you can use a 10A Socket.

Just bear in mind that if you continually push the table saw too hard it will easily draw more than 10A - I can get mine to draw 17A before it trips the thermal fuse on the motor..

Originally Posted by campidelli

Thanks for the reply! I am going to change it to Delta and get the 2.2kW 1 220v IN to 3 220v OUT then.

Do I need to put a circuit breaker before the VFD? If so, which one do you recommmend?

Thanks!

You dont need a CB before the VFD. The CB is to protect the cable and is taken care of in the switchboard. The VFD will current limit and protect the motor.