New motor and vfd on the way for RF-30 clone. now it starts

[bfi]

Made a couple purchases on eBay. Hoping I did ok on both. First up… Dayton 3 hp,3 phase, inverter suitable motor, with 7/8 shaft. (Yeah I get to keep my pulley stack) New motor open box, $200. Plus shipping. Second…This is where I’m hoping I didn’t make a mistake. Teco Westinghouse ma7200-2005-n1 vfd, 1 to 75hp, 0 to 400 hz. Preowned, tested and guaranteed to be 100 % functional. $50. Absolutely no idea at this time how to install and program. Should I git rid of the drum switch? Emergency STOP? Push button on and off? Trying to keep cost down, but I want to do it correctly and to minimize belt changes. Is there any other equipment needed for this conversion? Please be patient, with your help I’m hopeful of a nice setup. Thanks, Bart

 

[bulgie]

I believe you're missing a decimal point there pard. Should be 7.5 HP.

Were you planning on making an enclosure for it? That's considered Best Practice, but lots of people don't. Manual says
"Install the MA7200 in a location free from harmful mists, gases, liquids, airbornedusts and metallic particles" because whatever's in the air can get inside it, will get inside it over time.

I have one VFD that's open to "shop air" with no harmful effects, yet (about 4 years). I mounted it high enough and far enough from sources of chips or coolant, I think. Time will tell. Grinding and welding are not done in that room, so my air might be cleaner than some shops. I can't say from experience how bad it is to not enclose it, maybe nothing to worry about, probably others here can say more.

 

[Karl_T]

good score on that Teco. I looked at the online manual real quick, good choice for your equipment.

FWIW, I put it inside a box when i can. Got one mill where I put it in back away from where the chips (and fingers) can get to it.

 

[Eddyde]

Sounds like a couple of good scores!
You can use all the machines original switches you just have to wire them to the VFD's control inputs and the VFD directly to the motor.

 

[markba633csi]

Yes you can keep the drum switch but not in-between the VFD and motor. The switch would need to be wired to the VFD low voltage control inputs
That Teco is a nice unit if it works- I saw one listing for 358$

Drum switches are generally not ideal for low voltage switching- you may be better off using electronics-type toggles
or pushbuttons instead if you want to control the VFD remotely

https://www.tecowestinghouse.com/product/ma7200-plus-general-purpose-drive/

 

[bfi]

I do plan to mount it in an enclosure/clean area and use the remote I was thinking that it would be best to eliminate the drum switch and have push buttons for on/off and an emergency stop. The seller on the Teco had positive reviews and guarantees it to be 100% functional.

 

[Eddyde]

I have a different model Teco, an L510. I needed to make an auxiliary relay circuit to control it with a momentary, 3 push button, Forward, Reverse & Stop configuration. Not sure if that's what you want to do but here's how I did it if you need the info...
I should add, the circuit also allows for an instant forward reverse switch to be added that makes tapping a breeze...

Thread 'Wiring A Vfd To A Momentary Pushbutton Switch (update)'

Oct 13, 2015

I just installed a Teco L510 VFD to run my mill. I wanted to use a momentary pushbutton "Forward", "Reverse" and "Stop" switch, However, the VFD requires the switch status to be constant, so I designed a simple circuit using two latching DPDT relays to achieve the correct interface. I also made it so the latched relay will shunt the other relay, thus preventing the switch status from being in "run forward" and "run reverse" simultaneously. The VFD does have protection against that condition, but I figured it easy enough to do and it allows me to possibly attach other things to the...

• Eddyde
• forward reverse forward reverse stop high low speed latching relay micro switch momentary switch pushbutton teco l510 vfd
• Replies: 24
• Forum: ALL ABOUT ELECTRICAL ISSUES

• 

 

[hman]

When I added a VFD to my RF-30 clone, I built a control box that included a speed pot, a reversing switch(with shield that moved it back to "forward" when closed, and an "on" switch (Decora- style, with a large "slap anywhere to stop" hinged cover.