VFD on stock 2J Head bridgeport 3 phase motor ?

bobdog

bobdog

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Can I use a VFD on 2J head with stock 3 phase motor on it ? I know question has been asked but if can be done. How do you wire one and how well does it work. Would like to talk to somebody who has done it. Thanks Dave
 
Yes. The power must go from the wall, to the VFD, to the motor. No switches allowed between VFD and motor. The existing forward/off/reverse switch can be used as a low voltage control switch on the VFD low voltage side to run the mill. The existing wiring will need to be changed so it can do that. It is not a big deal.
 
Its an excellent way to power the mill as you will have variable speed if you get a vfd with a pot in it.
If you want to wire through existing wiring that runs through the switch, you'll have to turn the switch on
and remove the switch knob so it cant' be switched cycled.
 
bobdog said:
Can I use a VFD on 2J head with stock 3 phase motor on it ? I know question has been asked but if can be done. How do you wire one and how well does it work. Would like to talk to somebody who has done it. Thanks Dave
Click to expand...

I have installed an Automation Direct VFD on my BP knockoff mill similar to yours. I made a bracket-enclosure that accommodates the detachable programming console as well as a 3-position fwd/off/rev switch and a detent E-stop. The head is also a variable pulley style which allows me to achieve high torque at very low speeds. The combination works well for power tapping with larger taps. The 3 position switch and E-stop use the low voltage connections to the VFD.
 
uncle harry said:
I have installed an Automation Direct VFD on my BP knockoff mill similar to yours. I made a bracket-enclosure that accommodates the detachable programming console as well as a 3-position fwd/off/rev switch and a detent E-stop. The head is also a variable pulley style which allows me to achieve high torque at very low speeds. The combination works well for power tapping with larger taps. The 3 position switch and E-stop use the low voltage connections to the VFD.
Click to expand...
Does anybody have a wiring diagram and what VFD to use and how to wire my drum switch with it so I have reverse. Im not a electrician so anything would help so . I can do this Thanks Dave
 
many different VFD's may work on the milling machine.
if you have a VFD already, if you can tell me a model # i'm pretty sure i can find a diagram.
generally speaking it's not difficult to achieve directional control
 
Several possible wiring diagrams attached, I would recommend replacing the drum switch for a 3 way maintained ON-OFF-ON rotation switch and using momentary run commands. Switches that have been previously used for 120/240V switching often arc and the contact resistance can be a problem with the VFD low voltage signal switching. VFD signaling and external speed pot wiring can be 18-22AWG, power and motor wires are sized to the Hp rating (usually 12AWG for input power, 14AWG motor power for a 2-3Hp VFD). The VFDs usually need some basic programming, unless you use the simple 2 wire control.

A few VFD models to consider, my recommendation would be the Teco N3 or Hitachi NES1-015SB + NES1-OP
Teco 2 HP, 230 Volts, 1 Phase, IP 20, Teco, L510-202-H1-U
http://dealerselectric.com/L510-202-H1-N.asp

Hitachi 2 HP, 230 Volts, 1 Phase, IP 20, Hitachi, NES1-015SB + NES1-OP
http://dealerselectric.com/NES1-015SB-NES1-OP.asp

Teco 2 HP, 230 Volts, 1 Phase, NEMA 1, Teco, N3-202-CS-U
http://dealerselectric.com/N3-202-CS-U.asp
 

Attachments

  • Mill 2 and 3 wire control rev date 24 APR 2017.pdf
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Just did a similar upgrade on my lathe a few weeks ago. Everyone gave you solid advice the only problem I can see is if you're gonna use the same motor you have on it now you may have over heating issues if the motor isn't drive rated
 
killswitch505 said:
Just did a similar upgrade on my lathe a few weeks ago. Everyone gave you solid advice the only problem I can see is if you're gonna use the same motor you have on it now you may have over heating issues if the motor isn't drive rated
Click to expand...
There will not be overheating issues unless the motor is run at significant power for a long time at a slower than normal speed, where the existing fan does not move as much air.
 
Bob Korves said:
Yes. The power must go from the wall, to the VFD, to the motor. No switches allowed between VFD and motor. The existing forward/off/reverse switch can be used as a low voltage control switch on the VFD low voltage side to run the mill. The existing wiring will need to be changed so it can do that. It is not a big deal.
Click to expand...


That's not correct. You can use the existing switch by wiring the switch into the VFD and programming it to bypass the control. The speed control will not be affected. I just did this on a SB heavy 10.
 
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