Has the RAS actually got a 7.5hp motor?
I have both the 3hp/2.2kw Huanyang, and another budget 3hp/2.2kw Isacon/askpower VFD/inverter also.
Both bandsaw and tablesaw have 3hp motors
These are not vector drives, and If I'm not mistaken Vector drives are for high torque applications at a lower speed like on a lathe, than the motor normally runs at
which would be 60hz over there.
The motor needs to run at 60hz to keep cool.
I doubt you need one, the regular 100 quid ones in Europe are good enough for a 24" bandsaw and 12" tablesaw.
They are easy to hook up if your motor is dual voltage, takes about 30 seconds to configure from Star 300v, to Delta 230v. there might even be a schematic to show you, not that thats needed.
If not then you need to either pay a bit more for a 380v out VFD, or transform it to a dual voltage motor by diggin out the star windings ...two ends of the motor
windings and bring them up into terminal box and then configure to Delta
,
I suggest you make a cabinet for it, and if the buttons on the machine are not suitable, either buy some cheap buttons for about 3 quid a piece and make a box for them, if you do not wish to make the new buttons fit where the old ones were.
Not hard to fold a wee sheet of metal 5 times to make a box made from an old appliance and make a back and door for it to fit.
Carl Holmgren inspired paddle makes things a bit safer
The buttons will be a NO (normally open) start button, and a NC (normally closed) stop button, you might wish to pony up for a button station which I think is steeply priced for what they are.
As many stop buttons as you like.
You might notice the Huanyangs have the fan running constantly whereas the Isacon drives (the 3hp anyway) have the fan running only when the motor is activated.
Be careful and ask for dimentions if looking on ebay, as some sellers are selling these mini VFD's the size of your hand, with descriptions and pictures of the normal sized models!.
A few important rules are ....
This will be the brain of the motor.
Do not hit run without programming in the correct parameters, as these things have a default setting at eight times the rated speed of your motor!
Speed in parameter talk is related to frequency which is hz (Hertz) so will be 60hz in USA
Speed is also related to pole number, if the plate states around the 3000 RPM figure, it is a two pole motor, If it states around the 1740RPM then it is a four pole motor.
Speed is also in the RPM parameter.
Dont put a plug inbetween the VFD and the motor.
And remember to wait for the power to drain from these things well after there plugged out, as they retain a lethal charge...as there's a 50/50 chance you might need to swap two of the motor wires around
if the saw runs backwards....you must wait until it has dropped charge.
Just incase it has some ancient blade that you might do a test with, Do not bog your machine down ever.
You should never experience bogging down with a 3hp motor anyways unless something is very wrong.
Plenty of folks on uk forums with Huanyangs, I might want the Isacon/askpower feature though if it were me.
You need to buy a relay for the switches if you choose this one, or buy a single toggle switch instead and do the Holmgren job.
Tom