Hitachi VFD for my South Bend 16?

P

Plant machinist

Plastic

Joined

Apr 12, 2017

• May 2, 2017

• #1

Looking at the Hitachi WJ200-55LF for my newly aquired South Bend 16 three phase - 3HP, if I remember right 30 amp. Also looking at the pot switch WJ-VL 2K. Thought I would check here for experienced input since​ the local electrical store recommended​ this model not that I don't trust them since this is in there field. I will also want to run a Bridgeport mill form this too when I find the one I want. Probably 1 to 11/2 HP.

 

P

Plant machinist

Plastic

Joined

Apr 12, 2017

• May 2, 2017

• #2

$620.00 for the vfd and $25.00 for the switch.

 

rklopp

Diamond

Joined

Feb 27, 2001

Location

Redwood City, CA USA

• May 2, 2017

• #3

I like the WJ200 VFDs, but the 055 model, at 5.5 kW (10 hp) is too big for your application. The 022 model can handle a nominal 4hp motor, and is a lot cheaper accordingly. You might be ok with the 015 model, which is cheaper still. Check the motor full load current and compare with the VFD current ratings.

 

P

Plant machinist

Plastic

Joined

Apr 12, 2017

• May 2, 2017

• #4

I was told I need a vfd rated for twice the HP of my three phase motor.

 

JST

Diamond

Joined

Jun 16, 2001

Location

St Louis

• May 2, 2017

• #5

Plant machinist said:

I was told I need a vfd rated for twice the HP of my three phase motor.

Click to expand...

Only if the VFD is NOT adapted for single phase. The 022 SF is rated for the listed motor size running with single phase input, no de-rating necessary.

 

P

Plant machinist

Plastic

Joined

Apr 12, 2017

• May 3, 2017

• #6

How do I know the motor full load current?

 

JST

Diamond

Joined

Jun 16, 2001

Location

St Louis

• May 3, 2017

• #7

It is listed on the data plate attached on the motor.

If there isn't one anymore, or it is unreadable, you can use the NEC required allowance, or assumed current. That is usually a high estimate. A 3 HP 230V motor has an NEC assumption of 9.6A, call it 10A..

 

P

Plant machinist

Plastic

Joined

Apr 12, 2017

• May 3, 2017

• #8

Found it on the plate 220-9.5 amp / 440-4.75 amp. With that information​ which wj200 22 model would be best? I find different models. HF,LF,SF?

 

P

Plant machinist

Plastic

Joined

Apr 12, 2017

• May 3, 2017

• #9

Inverter : WJ2 Series : Hitachi Industrial Equipment Systems This is a helpful link.

 

rklopp

Diamond

Joined

Feb 27, 2001

Location

Redwood City, CA USA

• May 3, 2017

• #10

The WJ200 022SF is the single phase 240-V model. It is rated 11A in constant torque mode, so should do what you need.

 

P

Plant machinist

Plastic

Joined

Apr 12, 2017

• May 3, 2017

• #11

11 amp makes sense. Thanks for the help.