[slimneill]

I’ve been reading around and noticed that Hitachi is a popular VFD on this forum. I don’t want to have to reinvent the wheel so I’m hoping to be able to get a VFD that works for the Spindle I’m about to purchase. I plan to run Mach3, and I think that these VFD's take a 0-10v input and 2 other inputs for rotation direction?

I’ve seen that the majority of the VFD’s that are dual rated for single phase/3phase inputs tend to stop at 3hp.

The spindle I’m going to get is 4kW, (5hp)
At full speed (continuous operation):
Rated power : 3.8kW
Rated Torque:1.5 Nm
Rated Current:14.4A
At full speed (60% duty cycle):
Rated power : 4.6kW
Rated Torque: 1.8Nm
Rated Current:17.3A



Based on this info, I’m assuming that since I have a single phase 220V supply in my work shop, I will need to get a 3phase input VFD rated for double the max spindle current. ~35amp.
I read another thread on here where it was suggested that the Hitachi WJ200-055LF or -075LF will be suitable?
WJ200-055LF Inverter, 200 volt, 3 phase, 7.5 CT (10 VT) HP, 25.0 CT (30.0 VT) Amps
WJ200-075LF Inverter, 200 volt, 3 phase, 10 CT (15 VT) HP, 33.0 CT (40.0 VT) Amps
Which should I purchase? I don’t want to limit performance or damage the spindle by going with the cheaper option, but I don’t want to throw away money when I don’t need too either.

When would I see currents that high? During start up? Would it ever get that high during normal operation?
Thanks for any feedback in advance!!!

[Al_The_Man]

AFAIK Hitachi have dual models, 3ph rated and 1ph versions, so there would be no derating for a particular model.
With a VFD you do not get the inrush you do on a normal uncontrolled motor, VFD types that derate for 1 ph means that you would not be able to get the full performance of the motor if you used the 3ph motor rating.
Al.

[slimneill]

You are correct, all Hitachi VFD's can operate with 1 phase input.

Here is Hitachi's Sizing Guide:

Application: Sizing 3-Phase Inverters for Single -Phase Power Applications

So I'm pretty sure i'll be going with the WJ200-075LF Inverter, 200 volt, 3 phase, 10 CT (15 VT) HP, 33.0 CT (40.0 VT) Amps.

Do i need any inline reactors to cut back on interference?

[Al_The_Man]

If I was going to use just a single reactor, I would use it on the motor side rather than the input.
It is easier on both drive and motor, especially if the motor is not Vector rated type.
Al.

[slimneill]

What is vector rated type? How do I find this out?

[Al_The_Man]

Usually is says on the motor plate, if it is a standard older motor it won't be vector rated.
Al.

[slimneill]

I think the name plate i posted in my first post is what will eventually end up on the motor when it arrives....

[Al_The_Man]

One thing it doesn't seem to show is the rpm (2 pole 4 pole?).
Al.

[slimneill]

It says 2pole on the plate.