Category Archives: VFD

Electronics Motors VFD

Electric Scooter & new VFD update

I finally got my brother over to do some welding for me. The electric scooter is only a couple of nuts and bolts away from a complete frame. I have the core electronics finished .. so maybe this weekend I’ll be able to take it for my first test drive… I can tell I’ll need to extend my handle bar.. but that can wait for another day.

 

Work continues on the electric scooter... I got my brother to weld for me because he is better at it (but don't tell him that).
Work continues on the electric scooter… I got my brother to weld for me because he is better at it (but don’t tell him that).

The frame I build out of over priced metal stock from Home Depot.. (most of it is under the vehicle in the above photo) .. the front end is from a kid’s bike.. The motor and drive have already checked out.. don’t know what kind of speed I’ll get out of it, I doubt over 15mph or so.

 

I also scored another VFD today. It’s another Rockwell Automation VTAC9 but this one is much smaller and very bench-friendly. I have about 280VDC on the bus and I got it power up into precharge (kicks on at about 250VDC). I have another 90VDC in batteries and I thought another case (so 180V.).. I hope that’s enough to get me out of precharge or I’ll have to build a high voltage DC power supply. meh. I couldn’t finish my testing because my brother has shown up for the welding.

I scored another VFD. This one has a crap AC input but driving the DC bus direct works just fine as it has on all Rockwell Automation drives I've tried.
I scored another VFD. This one has a crap AC input but driving the DC bus direct works just fine as it has on all Rockwell Automation drives I’ve tried.

It’s front end (AC input) is dead but it looks like I can chop some jumpers to disconnect it. Though I had it hooked up when I ran up the DC input. I was running about 50 mA with the fans and UI running.  If you have one with no wires attached .. mine starts up with Terminal 1, 3, 4, 5, 6 and 7 jumpered and Terminal 8 and 9 jumpered. This base doesn’t have a “DC -” terminal like the large drive has.. so you can either tie it to the big DC bus jumpers off the capacitor board or there is a DC+ terminal and the DC- is a little single test point pin to the right of the terminals. If I have enough VDC in this house maybe I’ll be spinning a motor by the end of the week. I reprogrammed the drive already… it’s pretty self-explanatory.

 

Update: 402 VDC… still in pre-charge. I have a 150VDC power supply I’ll did out. I’m hoping 550V will do the trick.. 600VDC is nominal.