Undersized VFD for a CNC spindle?

S

snowluck2345

Aluminum

Joined

Mar 10, 2010

Location

California USA

• Apr 17, 2017

• #1

I am considering using a 1hp 110V VFD to power a 2.2KW ER20 router spindle. Are there any significant issues with this, beyond the spindle being limited to ~=34% of its maximum power and torque? I like that the 2.2KW spindle uses larger ER20 collets.

For my application 1hp is very well sufficient. Sticking to 110V for the system rather than having a secondary 208V (in my case) / 220V input would be nice.

 

R

Rescue35

Plastic

Joined

Feb 10, 2017

Location

TN, USA

• Apr 17, 2017

• #2

VFDs are cheap. Get the right size and supply it with the power it needs.

Sent from my SAMSUNG-SM-G890A using Tapatalk

 

Perry Harrington

Titanium

Joined

Oct 7, 2006

Location

Klamath Falls, Oregon

• Apr 17, 2017

• #3

A couple of things you should know:

A 120v VFD will only have a 170v DC bus, 220v(240v) VFD will have a 340v bus.

This spindle is designed for 220v and a 120v VFD will not supply the correct voltage to run the full RPM range.

These spindles are dirt cheap with a VFD, a 3HP VFD is only $120, you are better off getting the right VFD.

 

M

Monarchist

Diamond

Joined

Oct 2, 2012

Location

Sol, Terra

• Apr 17, 2017

• #4

snowluck2345 said:

I am considering using a 1hp 110V VFD to power a 2.2KW ER20 router spindle. Are there any significant issues with this, beyond the spindle being limited to ~=34% of its maximum power and torque? I like that the 2.2KW spindle uses larger ER20 collets.

For my application 1hp is very well sufficient. Sticking to 110V for the system rather than having a secondary 208V (in my case) / 220V input would be nice.

View attachment 196509

Click to expand...

So buy a VFD rated for 3 or 4 HP if/as/when fed 240 VAC 1-P, and rated for 1.5 or 2 HP if/as/when fed 120 VAC 1-P, delivering 230 VAC 3-P OUTPUT in either case. A voltage your spindle wants 'available', even if run at low-loads and odd choices of Hz.

Unless you need an oddly-shaped and short-lived room-heater with an ER master collet system on one end of it instead?

Lots of such VFD around these days. Some are cheap. Others are good. Far fewer are both.

TANSTAAFL

 

S

snowluck2345

Aluminum

Joined

Mar 10, 2010

Location

California USA

• Apr 17, 2017

• #5

This is the VFD I was planning on using: WJ2-7MF 1 HP .7kW 115V Single Phase Input VFD - Hitachi
Can you point me in the right direction for drives that accept a 220v or 110v input?

 

V

Vancbiker

Diamond

Joined

Jan 5, 2014

Location

Vancouver, WA. USA

• Apr 17, 2017

• #6

Another factor with trying the 110V inverter will be long accel and decel times to prevent low bus voltage alarms on accel and bus overvoltage on decel.

 

D

DonMarkey

Plastic

Joined

Jan 21, 2007

Location

Detroit Michigan

• Apr 17, 2017

• #7

VFD NES1-22SB, AC Motor Drive

 

M

Monarchist

Diamond

Joined

Oct 2, 2012

Location

Sol, Terra

• Apr 17, 2017

• #8

snowluck2345 said:

This is the VFD I was planning on using: WJ2-7MF 1 HP .7kW 115V Single Phase Input VFD - Hitachi
Can you point me in the right direction for drives that accept a 220v or 110v input?

Click to expand...

The "usual suspects" include Galco - who have a rather useful search & selection toolset, but it takes getting used to, Wolf Automation, Drives Warehouse, Drives Direct, and a several others.

My one, here was made by Weg, and was on sale at Galco, IIRC.

Most of the 'major' VFD makers now offer them - you are far from the first person with a need.
Do your research. Save grief and hassle.

The 'money' isn't all that different if you figure it over a VFD's typical five to ten year lifespan.

Beyond about seven years, the better makers will have suggested a new set of capacitors, and those usually cost as much as a whole new VFD, so... RPC's and Phase-Perfects can each last a great deal longer than the average VFD.

 

D

DonMarkey

Plastic

Joined

Jan 21, 2007

Location

Detroit Michigan

• Apr 17, 2017

• #9

WJ2-22SF 3HP 2.2kW 23V Single Phase Input VFD - Hitachi

 

M

Monarchist

Diamond

Joined

Oct 2, 2012

Location

Sol, Terra

• Apr 17, 2017

• #10

DonMarkey said:

WJ2-22SF 3HP 2.2kW 23V Single Phase Input VFD - Hitachi

Click to expand...

240 VAC input only is it not?

Here's a more flexible one, already in NEMA 4X enclosure, and with simpler Analog controls - no mucking about with 170 or so steps of tiny number codes:

http://www.galco.com/buy/KB-Electronics/KBAC-27DGRAY

ABB and others have similar units. KBB have lower-cost ones not in enclosures... etc....

 

Last edited: Apr 18, 2017

S

snowluck2345

Aluminum

Joined

Mar 10, 2010

Location

California USA

• Apr 18, 2017

• #11

Thank you! I found the drive I'm going to get:
http://www.galco.com/buy/KB-Electronics/KBDF-27D

 

F

Fully Defined

Aluminum

Joined

Oct 12, 2013

Location

San Francisco, CA

• Aug 29, 2021

• #12

snowluck2345 said:

Thank you! I found the drive I'm going to get:
KBDF-27D - KB Electronics - AC Drives | Galco Industrial Electronics

Click to expand...

Coincidentally, I just got the exact same KBDF-27D VFD to run a 1.5kw spindle from the far east, on a router - also with an ER20 nose. The specs from KB say it will deliver 1.2kw when powered from 115v, and I expect that to be enough for the application anyway.

Can you enlighten me on how you wired in the VFD from the breakout board? Also, four years later, how's it working out for you?