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Thread: Fitting VFD to Craftsman Lathe
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1st April 2011, 04:00 PM #1Member
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Fitting VFD to Craftsman Lathe
Have any members fitted a VFD to their Hercus lathe, if so I need your help as I am a
complete newbie with electronics.
I have a Reliance GV3000/SE 3HP VFD and want to fit it to my Hercus Craftsman Lathe.
The lathe has a 3/4 HP 3 phase motor controlled by a push button starter with overload control
linked to a forward/reverse switch.
Should I connect the VFD directly to the motor or use the existing connection through the
push button starter.
Also, where should set the 5 step pulley speed High,Mid or Low range.
I have managed to get it working by connecting it to an old 3 phase bench drill and changed the parameters, getting it to rotate, forward and back, jog and increase/decrease spindle speed etc but those are the easy bits.
Thanks
Col
P.s. Many more questions to follow
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1st April 2011, 04:55 PM #2.
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Col,
Posting this in the Metalwork forum will provide greater exposure and more chance of a reply.
Bob.
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1st April 2011, 05:14 PM #3Member
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Hello Bob,
Thanks for the hint.
Col
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1st April 2011, 10:57 PM #4Senior Member
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G'day Col,
Are you using the VFD to run your lathe from 240V or do you have 3 phase and just want the variable speed capeability?
The reason I ask is if you wish to run your lathe from 240 you will need to confirm your motor can be configured to run this way as 3 phase motors are generally wired to run from 415V.
As for connecting it up, the VFD must be connected directly to the motor and the contactor connected between the supply and VFD. VFD's do not like to be disconnected from the load when they are running as this will let the smoke out.
Generally the programming of the VFD is the fidliest part as it will need to be parameterised to match your motor or at best your motor will run very ineffeciently and at worst you will let the smoke out of your VFD.
If you have the manual for your VFD it will generally have basic setup and wiring instructions, if you don't have a manual try googling the part numbers as they can usually be downloaded from the manufacturer.
If you need any more detailed assistance feel free sing out.
Cheers,
Greg.
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2nd April 2011, 08:58 AM #5Member
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Hello Greg
Quote
Are you using the VFD to run your lathe from 240V or do you have 3 phase and just want the variable speed capeability?
The reason I ask is if you wish to run your lathe from 240 you will need to confirm your motor can be configured to run this way as 3 phase motors are generally wired to run from 415V.
Thanks for your help.
I have a 3 phase supply into my garage and run the Hercus lathe and drill from it and I will connect the VFD directly to the Hercus motor.
The speed control on the VFD keypad needs some improvement so I plan to use a remote with a small handwheel or star knob. Any ideas what I need to make one.
The manual downloaded from Reliance shows the connections but I have no idea what type of pot I need.
Thanks again
Col
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2nd April 2011, 11:35 AM #6Senior Member
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G'day Col,
I had a look at the manual from the following link:
http://www.reliance.com/pdf/drives/i...als/D23360.pdf
On page 65 is a diagram for 3 wire start stop control wiring. I used 3 wire start stop control as this lets you have seperate start & stop buttons. If you want to have a single on off switch you can use the two wire start stop control wiring diagram on page 64.
Both of these diagrams show a 5kohm pot for voltage referenced speed control (connected across terminals 12,13 & 15) but I suspect this would be the minimum required value and you could use a 10k pot if you like and it would work the same.
The main thing is to be sure to buy a linear pot so the speed control is even across the range, if you get a logarithmic pot (the type used for volume control) you will have fine speed control at one end and not very much at the other end of the knobs travel.
You can get the pot from Jaycar, Dick Smith or any other electronics hobby shop and it should cost less than a dollar.
Cheers,
Greg.
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3rd April 2011, 08:32 PM #7Member
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Hello Greg,
Bought a 10K linear pot, control knob and other bits from Jaycar today and will put it together tomorrow.
The separate stop/start will be on hold until I understand the rest.
The VFD is connected and the spindle rotates forward and reverse, and slows/increases magically. Need to understand the parameter settings.
The manual and others on the Baldor/Reliance site are very informative, particularly for an electronically challenged senior citizen.
The big test tomorrow...Engage cutting tool with workpiece!!!!
Thanks again
Col
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9th May 2011, 12:57 PM #8Member
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Hello Greg,
I'm in need of your help again
I followed your advice and used the 3 wire start/stop control and all works well, starting/stopping, Fwd/Rev but I cannot get the 5k pot to work.
The speed remains at the start up value and will not increase or decrease.
I downloaded
http://www.reliance.com/pdf/drives/i...als/D23391.pdf
Appendix G to try to solve it.
I guess it is one or two parameters that I need to reset.
Do you have any tips?
Cheers
Col
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9th May 2011, 02:52 PM #9GOLD MEMBER
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Hi Col,
What setting do you have for P.000?
Stuart
p.s. bare in mind I dont have this sort of VSD, I'm just reading the manual
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9th May 2011, 03:50 PM #10Member
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Hello Stuart
P.000 is set to REMOTE (rE). As I understand (with my very limited VSD knowledge) the P.000 LOCAL setting is used for the keypad entry.
I also tried various combinations of P.007(currently 0), P.008(currently 0) and P.009(currently 0)
Thanks for your help
Col
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9th May 2011, 05:14 PM #11GOLD MEMBER
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You're welcome, but I havent been much help so far
You are using terminals 12,13,15? with the center leg of the pot going to 13?
Stuart
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9th May 2011, 05:54 PM #12Member
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9th May 2011, 08:15 PM #13GOLD MEMBER
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good luck
hi i was always under the impresion that motor drive were very expensive.
maybe its just the siemens ones. roughly how much does one of these
small ones cost. for example 1 hp.
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9th May 2011, 08:53 PM #14Member
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Hello Azzrock
The Chinese ones are relatively cheap but I have no idea of the quality.
My Reliance GV3000/se 3HP 3 phase 415V is 5 years old and was good value if You know how to set it up..which I have some difficulty.
New ones of Siemens quality are expensive.
Try this one:
Telemecanique ALTIVAR 28 415v .75kw VSD AC VECTOR DRIVE (eBay item 200603925459 end time 09-May-11 15:49:50 AEST) : Industrial
It beats changing pulley speeds.
Regards
Col
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9th May 2011, 10:26 PM #15Product designer retired
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Azzrock.
Some of the Chiawanese VFD's are really cheap, around $70. Can't vouch for quality.
VARIABLE FREQUENCY DRIVE INVERTER VFD NEW 2HP 1.5KW 7A (eBay item 180515678895 end time 29-May-11 03:12:25 AEST) : Business Industrial
I paid over $500 for mine with remote pod, but its a special from Drives Direct, not your standard unit.
Ken
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