Author Topic: ADDING A VFD TO MYFORD SUPER 7  (Read 6879 times)

Offline Don1966

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ADDING A VFD TO MYFORD SUPER 7
« on: August 03, 2013, 06:26:37 PM »
I returned from vacation and work was piled up on me. My weekends and days full so not much has happen in the shop. When I finally had a break I decided to install the Frequency drive and motor I been having for quiet a while. So to start with I will try to explain how to go about installing a VFD as it is referred to, on my Myford super 7 lathe.
In the first photo you see the Teco drive with the terminal cover off exposing the terminals we will use to connect our external selector switch and potentiometer to.

This next photo shows the parts I will be using to mount the drive and make the control head with.

A photo of the drive mounted into the enclosure. I also mounted a 24VDC 1 amp power supply and this will power the tach meter. Above the drive you see a contactor that will be used to secure and Estop the drive. I will use a mushroom switch on the control head for this.

A shot of the drive all wired up and powered. This is where I start to enter the proper Function codes to get my control head to work with the drive. The drive comes with it factory set to operate by the on/off key and the arrow keys to increase and decrease the speed. We will now control the on and off by a selector switch and speed by a potentiometer.

In the photo I am adjusting the tach to match the speed.

A look at the control head with Estop, fwd/ reverse, and on/off selector with speed pot.

This is the control head mounted to the lathe. And the tach meter mounted to the DRO.


I will continue on a new topic.

Offline vcutajar

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Re: ADDING A VFD TO MYFORD SUPER 7
« Reply #1 on: August 03, 2013, 06:32:36 PM »
For somebody (like me) who has only heard of digital inverters and VFD, this is going to be interesting.

Vince

Offline Don1966

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Re: ADDING A VFD TO MYFORD SUPER 7
« Reply #2 on: August 03, 2013, 06:42:36 PM »
Now we need to know how and where to enter the values into the drive. I am attaching the sheets in JPEG and a complied PDF for those who are interested.
In order to see the Function code in the display I will give a sequence to follow:
1.   Push the DSP/FUN key to see the Function block.
2.   Use the up and down arrow keys to select the function block you wish to change (such as F05 the 5 will scroll with the arrow keys).
3.   Press the Data/ENT key to be able to change the value.
4.   Use the up and down arrow keys to change the value.
5.   Press the Data/ENT key to accept the value. (The display should say End)
6.   Press the DSP/FUN key to return to Display mode. (by the way display mode shows the Frequency you control 0-60 or 0-50 which ever is selected).
If you look at the attached sheets.  I have marked them to show what I will be changing, yours may vary. I try to point out what is being used and not being used.
 On the Parameter function sheet, function code F02 Deceleration time I change in the factory default block I change 5 sec to 2 sec..
 In function code F04 we change the 000 code to 002, this is because we a using external controls, the TM2 terminal is on the signal terminal sheet.
 In Function code F05 we change from 000 the up/down key pad to 002 this is the analog input from TM2 which will be 0-10vdc from pot to control the frequency drive.
Function F06 is set for 000 fwd stop and reverse stop ( this is for our selector switch two position and is set.
Now if you look at Function F11 and F12 this is our selector switch input for fwd and reverse and is already set, as is F16 is set to  (0 to 10V). We will accept all the rest of the factory defaults setting
ONE WORD OF CAUTION:
 Make sure all power is secure before disconnecting or reconnecting any wires. Insure all equipment is properly grounded and all penetrations have proper through connectors. And please guys for your sake and ours, be careful when dealing with electricity you donít get to many second chances. If in doubt call an electrician.
I hope some of you find this information valuable and if you do proceed to install one and need help just PM me.
 
I havenít had a chance to draw the diagram for my set up yet but I will post it when complete for anyone interested in it.

The sheets are listed as follow:
1.   The connection diagram for the power terminal.
2.   The Signal terminal points.
3.   Wiring diagram for the VFD.
4.   Parameter list.
« Last Edit: August 04, 2013, 12:38:31 AM by Don1966 »

Online steamer

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Re: ADDING A VFD TO MYFORD SUPER 7
« Reply #3 on: August 03, 2013, 06:43:43 PM »
That's awesome Don!

I know I love mine!

Dave
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fcheslop

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Re: ADDING A VFD TO MYFORD SUPER 7
« Reply #4 on: August 03, 2013, 07:56:10 PM »
Hi Don, Ive never used that maker so thanks for the insight.
cheers

Online Jo

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Re: ADDING A VFD TO MYFORD SUPER 7
« Reply #5 on: August 03, 2013, 08:17:14 PM »
Ok Guys I am not convinced... Why would I want one? As far as I am concerned VFD as the speed drops the power drops.  On my Colchester I get 3HP at 1200RPM or at 54RPM, both of which are very scary :o

 :embarassed: I like my DROs on the lathe, especially the three channel one on the Colchester  8)

Jo
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Re: ADDING A VFD TO MYFORD SUPER 7
« Reply #6 on: August 03, 2013, 08:27:00 PM »
Ok Guys I am not convinced... Why would I want one? As far as I am concerned VFD as the speed drops the power drops.  On my Colchester I get 3HP at 1200RPM or at 54RPM, both of which are very scary :o

 :embarassed: I like my DROs on the lathe, especially the three channel one on the Colchester  8)

Jo

Jo
I can't speak to 3 hp...but with 3/4 hp...I don't see any reduction in torque...it seems to run fine.

Dave
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Damned ijjit!

Offline Don1966

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Re: ADDING A VFD TO MYFORD SUPER 7
« Reply #7 on: August 03, 2013, 10:05:13 PM »
Ok Guys I am not convinced... Why would I want one? As far as I am concerned VFD as the speed drops the power drops.  On my Colchester I get 3HP at 1200RPM or at 54RPM, both of which are very scary :o

 :embarassed: I like my DROs on the lathe, especially the three channel one on the Colchester  8)

Jo
Jo it all depends on how much money your willing to spend. The drive I used is a cheaper version of the VFD. This drive is a senseless vector drive, meaning that is has no encoder added to it to sense rotational position. The drive has a motor model programmed into it, which is a standard motor model. All motors have different characterics and very from each other. For instants the lock rotor KVA is different for motors designed for certain applications and each has a code letter stamped in the name plate for that value.
The vector drive will give you all the same advantage of a DC motor and more. The speed and power limitations have been over come in the more expense drives. These drives have PWM features for Volts verses Frequency or as we call it volts per hertz. The control of slower speed is just a matter of controlling the volts/hertz curve to maintain the Motor torque current for that speed. The more expensive models calculates this continuously and reads the encoder input to calculate motor stator resistance and rotor resistance per revolution and calculates the value need to maintain speed and motor current required.
I don,t want to bore you with to many details and have only touch base on some of them, but this gives you an idea of what VFD'S do and there place in the industry. I deal with them on regular bases they are all over.
Oh yes! I failed to mention that most motors used on the bigger drives are convertor duty motors. This makes them more expensive because of the way they are wound and cooled. Bigger drives required forced ventilation or water cooled. Smaller drives motors work fine as long as they a not used continuously at low speed or they will heat up due to lack of ventilation for instant (a fan cooled motor).

Don
« Last Edit: August 03, 2013, 10:15:30 PM by Don1966 »

fcheslop

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Re: ADDING A VFD TO MYFORD SUPER 7
« Reply #8 on: August 03, 2013, 10:08:25 PM »
More the better Don, its updating me a little
cheers

Offline maury

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Re: ADDING A VFD TO MYFORD SUPER 7
« Reply #9 on: August 03, 2013, 11:11:29 PM »
Y'all, I have added a VFD to my Calusing 12" lathe and have been using it for a couple of years now. I did it to replace the problematic mechanical speed control. I kept the clutch and the low/hi speed. Bottom line, I LOVE it. I can go way down in RPM far below what I need for large flywheels, and can go up as high RPM as I dare. There is no noticible loss in torque.

I have recently gotten a CNC mill which I'm in the process of change over to 3ph so I can add a VFD to it also.

The thing is, if you are new to the hobby and don't have 3 phase in your shop, no problem. You can buy used 3ph tools a lot cheaper then single ph tools, add a VFD for less than the difference, and have a better machine.

maury
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Online steamer

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Re: ADDING A VFD TO MYFORD SUPER 7
« Reply #10 on: August 06, 2013, 11:17:02 AM »
I really like being able to thread to a shoulder, very slowly and stop.   and if using a button die...hit reverse for a fast withdraw ....really convenient!

Dave
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Damned ijjit!

fcheslop

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Re: ADDING A VFD TO MYFORD SUPER 7
« Reply #11 on: August 06, 2013, 05:25:50 PM »
Except on the Myford the chuck tends to unscrew :facepalm:dont ask
I have in the past on Mitsi units altered the ramp time to help
cheers