[GreenKeys] Baud rate change

[steve bennett]

 "You cannot run a motor designed for 60Hz on 50Hz. But going from 50Hz to 60Hz is no problem. "I was going to say the same thing.I looked this up a while back concerning transformers and a motor is just a rotating transformer.There is just one catch. I think I remember reading that if you change the frequency you have toalso change the voltage a proportional amount.This is because a motor or transformer has an inductive reactance that changes with frequency.So you should adjust the voltage to compensate for the change in reactance. (in order to get the same current)This becomes a problem if you need to increase the voltage because you are limited to what voltagethe windings are rated for.When you buy one of these VFDs they have parameters you set for how you want thevoltage to change when frequency changes. You set the values so that you do not exceed the voltage ratingsof your motor.
-Steve

    On Wednesday, September 1, 2021, 11:10:23 AM EDT, Paul Heller <paul0926 at comcast.net> wrote:  
 
 Since you say you want 110v and 60Hz and 45.45 baud, what I am about to write is probably not of interest. 

As for burning up the motor, no it’s the other way around. You cannot run a motor designed for 60Hz on 50Hz. But going from 50Hz to 60Hz is no problem. I have been running my Lorenz 15c on 60Hz without any issues. The motor can be adjusted to get to the desired speed.  

The power box — well, I don’t know what that is. 

The voltage is a different matter. I wanted to keep mine original and so I use a step up transformer. So I am feed 240v 60Hz into the Lorenz. 

Jeff Angus made a fantastic controller that switches speeds on his machine. If you search Greenkeys archives you can find it. I believe it runs 110v

As I asked previously, what machine do you have?

Paul


> On Sep 1, 2021, at 8:47 AM, Joe Duszyński <joeduszynski1 at gmail.com> wrote:
> 
> 
> The motor has an odd governor on it with an external box which also supplies the loop current the unit does not plug directly into wall voltage the wiring goes from the unit into that external box then it(the box) plugs into 220v 50hz needless to say its not running at 50 baud its running slightly faster because of the 60hz. 
> 
> If I messed around with the governor and an oscilloscope I "COULD" probably get it to run at 50 baud but the motor and that power box won't live a happy life being fed 220v 60hz vs its native 220v 50hz eventually it will overheat and BBQ.
> 
> I'd rather run it either on DC or 110VAC 60hz
> 
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