Ok, how are you going to run steel train wheels on the chassis dyno steel rollers ?  

By adherence.

We have already performed that type of test. 

Posted by: @totally_dyno_beginner

By adherence.

We have already performed that type of test. 

Would love to see that ? Steel on steel run on a chassis dyno!

We know trains run on steel tracks with steel wheels "adherence - friction between the drive wheels and the steel rail" 

But to run it on  a chassis dyno would definitely  be interesting  to see !

Yes I know and I would also be delighted to show you, but unfortunatly it's a confidential project. I am afraid I cannot publish videos of it on the web.

I have a question because I would like to see how the roller test bench works thus I would like to perform a light test (I mean a test with a small machine that do not require the full braking capacity of the retarder).

Knowing that the retarder gives at 192V the maximum of its braking torque, Can I use a smaller power supply for example a 0-100V power supply ? Is the retarder going to work properly ?

The reason is that I do not have a 192V power supply yet. 

I wanted to take advantage of this message to thank you because you offered me a great help 🙂 

Hi Totally_Dyno_Beginner,

" Would love to see that ? Steel on steel run on a chassis dyno!"

That was just a rhetorical question?

As us chassis dyno owner/operators have trouble with roller (Knurled steel ) traction to rubber tyres. That's why my question.... someone's my humour is lost/misunderstood!

I understand the work you're doing and mentioned it is of secrecy and you can't devolgue too much information/film_clip But you have many questions! and we're trying to decipher between the lines of your questioning?

If you are after sensitivity why use such a large retarder " electric brake " on low lever rpm/torque ?

Yes I know it is hard for you to say without details or pictures. I am sorry about that, I try my best to make it clearer.

Among the machines I want to test, some are light and others are pretty heavy. This is the trickiest part of my project : building something that works for all machines.

Consequently, for light machine the retarder is oversized.

My question was just can I size down the power supply when testing lighter machine since I do not require full torque. Would it damage the retarder or make him work differently ?

I am asking because I do not have a 0-192V power supply off the shelf. 

What power supply do you have ?  

The caracteristics are : 800W 120V 6.5A 

When I am looking for 0-192V power supply, I find programable device very expensive whereas I do not need programing 

I could buy the JDM Dyno system power supply mentionned in the wiki but I did not find the webpage, plus it might be adapted to UK standards.

I am sorry guys to ask again.

Do you know if my lower power supplier could drive the Telma brake please. 

Hello,

You seem to be on the right track with your approach to simulating road slope on a roller test bench. Using an electromagnetic Telma retarder and controlling the braking force by adjusting the current will allow you to reproduce the required torque corresponding to a given slope.

The formula you mentioned (H = I*N/L) does indeed describe the relationship between the magnetic field strength and the current in the coil. So a variable power supply with the ability to adjust the current would be a suitable solution for controlling the retarder.

However, for precise calibration and reproduction of the required torque levels, you may need additional equipment, such as torque sensors or current meters. It's also recommended to have a cooling system for the retarder to prevent overheating during extended operation.