DC motor control help

BigDon said:
Kim and Gary, I am now a little confused. You both have these 2 or so HP motors running on mc60 boards. I think Gary you said yours was like 17 amps but these mc60 boards I have seen are only 10 amps max. This is what I am not sure about. They sell these treadmills with 2 hp motors but use a mc60 board with a 10 amp max. My motor come from a treadmill but it did not have the controller. I have a couple of KB boards coming with a 12 amp rating. I guess we will see if they smoke or not when I get them.
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You are right..... the proform treadmill that I got my motor out of is rated on the motor plate at 2.5 hp. An MC60 was also in there running it......

It must work....

Kim
 
Thanks Kim, You have been a great help more than once while I have been beating my head to figure something out. I am going to see how it does.
 
BigDon said:
Kim and Gary, I am now a little confused. You both have these 2 or so HP motors running on mc60 boards. I think Gary you said yours was like 17 amps but these mc60 boards I have seen are only 10 amps max. This is what I am not sure about. They sell these treadmills with 2 hp motors but use a mc60 board with a 10 amp max. My motor come from a treadmill but it did not have the controller. I have a couple of KB boards coming with a 12 amp rating. I guess we will see if they smoke or not when I get them.
Click to expand...

Don,

Yeah, it's easy enough to get confused. I know on my setup, I won't be pushing the motor. When you push the motor - say to the stall point - is when it pulls the most amps from the controller. In my case, the MC60 was free, and I think the one I have is rated more than 10 amps, I forget.
I also work on the realization that there is some measure of safety buffer built into electical devices. If it's rated for 10A and you go to 10.1A momentarily, it's not going to blow up. How high can you go? Dunno

If it smokes it smokes, I've got another spare in the shop.

Not sure if you've tried searching, but DC motor controls have been discussed here in the past, and there's a lot of good info in those old posts.

HTH

Gary
 
Hey Gary, yes I have looked, a lot ;-) I think sometimes that adds to the confusion! I always try to be careful and maybe over think some things but I have learned not to rush into something. As I am sure you already know, it is a lot safer and it will save you some money as well. Wish I had half the money I spent on an idea I had with out looking into it further. Bad thing is, sometimes what I should have or ended up having to do was cheaper than the way I thought would work. Live and learn!
Thanks for the help!
Donnie
 
I stand corrected

I have been informed by one of my coworkers that it indeed will eventually pull more current than the board is rated for and damage the board. Most of the drives that I work with have current limiting fuses in them to prevent this, so I haven't run into this problem before. I am sorry for having inadvertently misled you on this. On the other matter, running the router on 90V DC, my source says it probably won't run, but if it does run, it will run very badly, and not worth trying it.

Jim Notestine
 
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