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Rockwell/Delta 17-600 Drill Press 3 Phase Conversion

HeavyChevyDeuce

Plastic
Joined
Jan 31, 2023
I am about to purchase a Rockwell/Delta Model 17-600 Drill Press with the Adjustable RPM knob on the front head. The motor is Rockwell Model # 86-909; 1725 rpm; Frame 66, Type P. The machine is 3 Phase but I will need to convert to single phase. What is my best option as I don't have 3 phased power in my garage. 1) Is rewiring it a hard job from 3-phased to single? 2) Should I get a VFD and wire in? 3) Should I find another motor with same frame setup and just replace?
 
Either VFD or replace the motor. I bet the VFD is cheaper then a new motor. VFD gives power braking, fast reverse and variable speed. the variable speed is not important to your dp. You can use the existing switches to control the VFD low voltage controls.
Bill D
 
That is probably an easy motor to replace, check out Automation Direct.
Well I did, and Frame size 66 has a 3/4" shaft - seems fairly unique, and not listed on Automation Direct site.
Use a VFD, but make sure it's rated at 1.5 x motor HP rating.
Yould need a simple switch to control the VFD. The drill press may have a magnetic switch for the 3 ph motor. Just use a simple toggle switch, and wire the VFD directly to the motor - no switches between VFD & motor.
Bob.
 
They make 120 volt input VFD's that output three phase 2o8 volts.
Bill D.
So if I find the correct VFD that puts out 208 volts with a 120v feed, will that cause the current 1HP 3 phase motor to lose the power or torque needed to drill 1-1/2" holes thru 1-1/4" thick steel plate? Do you have a recommended VFD?
 
That is probably an easy motor to replace, check out Automation Direct.
Well I did, and Frame size 66 has a 3/4" shaft - seems fairly unique, and not listed on Automation Direct site.
Use a VFD, but make sure it's rated at 1.5 x motor HP rating.
Yould need a simple switch to control the VFD. The drill press may have a magnetic switch for the 3 ph motor. Just use a simple toggle switch, and wire the VFD directly to the motor - no switches between VFD & motor.
Bob.
So it doesn't sound like I can just find this same spec motor to replace the current and maybe stuck with getting a VFD. It is a 1HP motor so why do you suggest getting a VFD rated for 1.5 hp? Do you have a suggested VFD that you recommend?

r/, Will
 
So it doesn't sound like I can just find this same spec motor to replace the current and maybe stuck with getting a VFD. It is a 1HP motor so why do you suggest getting a VFD rated for 1.5 hp? Do you have a suggested VFD that you recommend?

r/, Will
If I understand your situation correctly, your drill press has variable speed cone pulleys.
Secondly, a frame size 66 motor has a 3/4" spindle, according to NEMA.
If that is the case, you'll need a single phase motor with a 3/4" spindle, which don't seem to be very common. Changing to a different size motor spindle will mean changing some complicated pulleys, if I'm understanding correctly.

So a good option would be to use a VFD to create 3 phase power from a single phase supply.
A VFD rated for 1 hp 3 phase output assumes it has 3 phase input. With single phase input you have to de-rate them, hence 1-1/2 hp VFD for 1 hp motor.
If you maintain the existing pulleys on the drill press, adding the correctly sized VFD will not affect the drilling capacity.

I don't know anything about 110 volt input VFD's giving 220 volt output.
However I would say don't mess with "cheap" VFD's. Get a brand name industrial one such as Fuji.
This one would be ideal and not expensive. (Fuji does not do 1-1/2 hp).
Bob

 
If I understand your situation correctly, your drill press has variable speed cone pulleys.
Secondly, a frame size 66 motor has a 3/4" spindle, according to NEMA.
If that is the case, you'll need a single phase motor with a 3/4" spindle, which don't seem to be very common. Changing to a different size motor spindle will mean changing some complicated pulleys, if I'm understanding correctly.

So a good option would be to use a VFD to create 3 phase power from a single phase supply.
A VFD rated for 1 hp 3 phase output assumes it has 3 phase input. With single phase input you have to de-rate them, hence 1-1/2 hp VFD for 1 hp motor.
If you maintain the existing pulleys on the drill press, adding the correctly sized VFD will not affect the drilling capacity.

I don't know anything about 110 volt input VFD's giving 220 volt output.
However I would say don't mess with "cheap" VFD's. Get a brand name industrial one such as Fuji.
This one would be ideal and not expensive. (Fuji does not do 1-1/2 hp).
Bob

Bob,
Thanks so much for that info. Once I get my hands on the actual drill press, I will contact the company link you suggested. I don't know anything about VFD's yet but I'm making an assumption that wiring the hookup comes with the device? or can tech support walk me thru installation?

r/, Will
 
Bob,
Thanks so much for that info. Once I get my hands on the actual drill press, I will contact the company link you suggested. I don't know anything about VFD's yet but I'm making an assumption that wiring the hookup comes with the device? or can tech support walk me thru installation?

r/, Will
They are quite straightforward to wire up.
I have a 220 volt 20 amp circuit in my shop, and I just plug my mill in that.
Wire your two "hots" for the 220 onto the L1 & L3 terminals on the VFD.
Then wire your motor directly to the output terminals, "U V W", using appropriate wire size.
You probably have a magnetic starter on the drill press now. I would disconnect that completely.
Get a simple toggle switch and wire that to the "CM" & "FWD" on the small contact strip. There is almost no voltage in this circuit; you are just completing the circuit to tell the inverter to start up, and your motor will run. You only need small gauge wires. Put the toggle switch in a small box to protect it, maybe same box as the inverter.
If your motor is running in reverse, then simply switch 2 of the "U, V, W" connections.
There's a lot more functions on the VFD which probably won't be much use. However if your slow speed setting on the drill press is too high, you can use the potentiometer on the VFD to slow it down further, by reducing the frequency. It will reduce the torque output of the motor some, but use your judgement as to what works.
If you want to do tapping on the machine, get a 2-way toggle switch and connect it to "FWD, CM, REV" on the VFD. This will allow instant reverse - use it at slower tapping speeds, not high rpm.
Fuji tech support are great if you need help.
There's a link here from Fuji; it goes into much more detail than you need, but you might find it useful
Good luck.
Bob
 
For a drill press you could buy a static phase convertor for cheap. Simple to wire and use. You will lose a little bit of hp but I doubt you will notice it.
 

When I read your message and followed the link, that DPS model says it is not suitable for 1HP engines. Then if I read the label correctly, the 1 HP version shows 3 amps (I'm assuming that is the output amperage) but my motor shows 3.8 amps (@ 230)/1.9 amps (@ 460). It doesn't appear that it would work for my application. Please advise. thx
 
They are quite straightforward to wire up.
I have a 220 volt 20 amp circuit in my shop, and I just plug my mill in that.
Wire your two "hots" for the 220 onto the L1 & L3 terminals on the VFD.
Then wire your motor directly to the output terminals, "U V W", using appropriate wire size.
You probably have a magnetic starter on the drill press now. I would disconnect that completely.
Get a simple toggle switch and wire that to the "CM" & "FWD" on the small contact strip. There is almost no voltage in this circuit; you are just completing the circuit to tell the inverter to start up, and your motor will run. You only need small gauge wires. Put the toggle switch in a small box to protect it, maybe same box as the inverter.
If your motor is running in reverse, then simply switch 2 of the "U, V, W" connections.
There's a lot more functions on the VFD which probably won't be much use. However if your slow speed setting on the drill press is too high, you can use the potentiometer on the VFD to slow it down further, by reducing the frequency. It will reduce the torque output of the motor some, but use your judgement as to what works.
If you want to do tapping on the machine, get a 2-way toggle switch and connect it to "FWD, CM, REV" on the VFD. This will allow instant reverse - use it at slower tapping speeds, not high rpm.
Fuji tech support are great if you need help.
There's a link here from Fuji; it goes into much more detail than you need, but you might find it useful
Good luck.
Bob

Bob,
I just picked up my DP yesterday and about to tinker with it to be able to power it up once I understand the right VFD. You mentioned this in an earleri post,
"So a good option would be to use a VFD to create 3 phase power from a single phase supply.
A VFD rated for 1 hp 3 phase output assumes it has 3 phase input. With single phase input you have to de-rate them, hence 1-1/2 hp VFD for 1 hp motor." I think you also mentioned that Fuji doesn't make 1.5 hp so would have to step up to a 2 hp Fuiji VFD because of the de-rating. I contacted Wolfautomation based on the link you sent me and thier tech guy, Tim Springer said the following:

"I would start with this Fuji. Please follow the link below. Please review all specifications and make sure it meets the requirements"

https://www.wolfautomation.com/vfd-1hp-230v-single-phase-5-5a/?utm_source=link&utm_campaign=tim
VFD, 1hp, 5.5A, 230VAC, Single Phase Input, Compac
VFD, 1hp, 5.5A, 230VAC, Single Phase Input, Compact Micro Drive, Easy To Use, Optional NEMA 1 Kit: NEMA1-C2-104 and Optional DIN Rail Mounting Adapter: RMA-C1-0.75 Available to Order Separately
www.wolfautomation.com

I wrote back to him with with you were saying about going with a higher one because of the "derate"....his response was. "

Well I only working on Automation for industry Plants for 20 years. The manufactures of VFDs already derate based on the input voltage. I use the manufacture's recommended VFD for your name plate.


Best Regards,

Tim Springer

Technical Sales Advisor"

So i'm a fledging learning from you guys as this learning curve is pretty steep right now.....lol. I need a little more "hand holding" here....lol....until I feel comfortable ordering the right product and can feel comfortable wiring it up correctly and not damaging my investment as I understand that this motor is not the standard motor that I can easily find if I screw up.

So after deciphering all above as to what should be the correct fuji VFD, 1) what do you suggest? go with the one the tech says (Tim) or step up to the 2hp model you suggest? Let's say I step up to the 2hp model, do I loose anything? or do I stay with the suggested 1hp since Tim says the model has already been derated? 2) See my attached pics which shows the wires coming from the DP electrical box, is there some drawing to tell me which color wire is what and where it should go into the VFD? Now that I think about it while typing, I probably should have taken the electrical box cover off to see if these wires actually match the colored wires coming directly from the engine.
 

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The VFD I recommended "FRN00010C2S-2U" is a VFD designed for 3 phase input, but can be used with single phase input if you de-rate the output to 1 hp, or 4.6 amps. Currently $209 at M-W.

The VFD Tim recommended is one designed for single phase input, and does not need to be de-rated. Basically the same VFD with a different part no. "FRN00010C2S-7U".
Same part No; one is "2U", the other "7U". Currently $216 at M-W.

We're both correct. Make your choice.
Fuji publishes a document for to define ratings for 3-ph VFD's used on 1-ph.

There should be 3 wires plus ground off the motor. These are connected to to the terminals on the right side of VFD. Terminal U,V,W from memory. No switches between VFD and motor on these wires. Just connect them and don't worry about which ones on which terminals. If the motor runs backwards, just reverse any two of these wires.

Connect your switch to the "CM" and "FWD" terminals on VFD.
Good luck ! It's really very straightforward.
Bob


 








 
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