Voltage Clamping Circuit?

[Disney]

I've searched here and on Google and I'm not seeing what I think is the thing i'm looking for. I have an Eddy brake dyno set up in my garage that runs off 240V 1ph 30A service. Problem is i'm getting 242V across my leads and it's not allowing the dyno to work. I need to limit voltage to under 240. Is there a relatively easy way to do this?

 

[PCustoms]

How did you figure out that 242v is what is stopping the dyno from working?

That is well within the range of OK voltage.

 

[Disney]

Others with similar issue. Friend runs his off a generator. Was making 242V. He backed idle down and it mades 238V and now dyno is working.

 

[PCustoms]

What are the specs on it?

There's been a few other threads recently about Chinese motors designed for 230v and requires buck/boost transformers to drop the voltage.

Seems ridiculous to me though.

 

[Disney]

What are the specs on it?

There's been a few other threads recently about Chinese motors designed for 230v and requires buck/boost transformers to drop the voltage.

Seems ridiculous to me though.

It's a 900hp internal Eddy Brake dyno, well two of them. One for each hub. I used them at my shop at work and they work, 240V. I bring them home and they don't 242V. I have nothing else to go on other than other people that have also had this issue and found limiting voltage cured their problems. The "Problem" is that it won't load the Eddy brakes. It will load it some what, but when I command 30% load, it will stall most vehicles. Right now I can command 100% and it feels like about 5-10%.

 

[PCustoms]

It's a 900hp internal Eddy Brake dyno, well two of them. One for each hub. I used them at my shop at work and they work, 240V. I bring them home and they don't 242V. I have nothing else to go on other than other people that have also had this issue and found limiting voltage cured their problems. The "Problem" is that it won't load the Eddy brakes. It will load it some what, but when I command 30% load, it will stall most vehicles. Right now I can command 100% and it feels like about 5-10%.

Specs, as in model #, brand etc.

Everything else is a guess without the information

 

[BillK]

This might be a stupid question but have you talked to the manufacturer ??? That would be my first call.

 

[wyliesdiesels]

I cant imagine 2V causing an issue.

What are the specs and make and model?

Or do you have an online manual?

 

[Whiskeymike]

For a few volt drop, could you try a 200’ extension cord as a test to get a 3-4v drop? Just curious.

I started the thread on the buck boost mentioned above and there’s great info there. But that was for a 25v drop for a machine designed to work on 220v.

 

[wyliesdiesels]

Is it possible this dyno is 3 phase?

 

[ForceFed70]

I also find it hard to believe the extra 2V is causing the problem. If it is, then that's a pretty big design flaw. Very common to have over 240V, Mine measures closer to 250V than 240V.

 

[wyliesdiesels]

Most PoCos have a 5% allowance- 228v<240v>252v

2volts is not even 1%

 

[laser3kw]

Could there be a protection circuit in the hardware / software that is the culprit? I agree with the others, 2 volt shouldn't stop it from working.