Telma retarder power supply options?  

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 -ww-
(@ww)
Member

I´m renovating at the moment two Telma CC160 retarders and now charting options of power supplies.

Going to use them as hub dynos, so both need own power supply.

Sportdevices has two different kind:
Brake Power Supply PWS3.2

Brake Power Supply HS-PWS

Note 2: HS-PWS does NOT include the fast discharge feature (HS-PWS-D) this product is in the final tests stage about to start production phase

What does that mean?

 

I have searched aliexpress etc. but is there any usable options?

Quote
Posted : 10/01/2020 8:34 pm
(@admin)
Member Admin

Hi,

The two SportDevices power supplies are very good and they work equally good. The HS-PWS-D is a new version that is not released yet. It includes a feature to discharge the current in the Telma fast when you suddenly turn off the brake. The point with that is the following: At the end of the run when you want to start the retardation phase, ideally the Telmas should turn off very quickly, otherwise it looks like there is a lot of transmission loss at that point. Normal power supplies are quite slow to turn off due to the Telmas having a high inductance. Burning off that power faster is possible with a big power resistor and that is what the HS-PWS-D is doing. 

Anyway, YourDyno ignores the first 2 seconds of the retardation phase to get around this common problem. The retardation follows a mathematical formula pretty well, so ignoring the first 2 seconds is no problem unless your retardation phase is very very short. 

SportDevices is the only off-the-shelf power that I know of. But there are many options if you want to build one. Check out this option, it is tried and simple: https://yourdyno.com/YourDynoHelp/maha-chassis-dyno-retofit/ Make sure you know what you're doing if you go this route.

 

ReplyQuote
Posted : 10/01/2020 9:32 pm
 -ww-
(@ww)
Member

How about these?

https://s.click.aliexpress.com/e/sNoooYy g" target="true">200V/3000W Powersupply 0-200V Adjustable Power 200VDC AC-DC 0-5V Analog Signal Control

ReplyQuote
Posted : 10/01/2020 9:46 pm
(@admin)
Member Admin

The link does not work

ReplyQuote
Posted : 10/01/2020 9:57 pm
 -ww-
(@ww)
Member
Posted by: admin

The link does not work

https://www.aliexpress.com/item/32892907598.html

ReplyQuote
Posted : 10/01/2020 10:03 pm
(@admin)
Member Admin

The spec looks good. 

There is no mention of the speed of the regulator. Some power supplies are slow by design (but you can typically turn off the slow start). That part is probably ok, but worth asking if you go this route. You should also ask if it can drive an inductive load (like a DC motor). When you turn off fast the current will continue to flow in the Telma, which the power supply must support, otherwise you need an external power diode (with cooling). 

It could be ok, nothing wrong from the spec. But it is almost the cost of the SportDevices option. 

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Posted : 10/01/2020 10:22 pm
 -ww-
(@ww)
Member
 -ww-
(@ww)
Member

(HUB Dyno 2500hp) part2 vlogg #5

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Posted : 11/01/2020 10:27 pm
(@admin)
Member Admin

That test in the vlog looked promising.

Cool if you go for any of those brake supplies and can report back. 

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Posted : 11/01/2020 11:02 pm
 -ww-
(@ww)
Member

One question, if i wire new coils to series, how i check the polarity? With compass, or is there any difference how i connect them...?

 

E: Second question, how can i add picturelinks here?

This post was modified 2 weeks ago by -ww-
ReplyQuote
Posted : 11/01/2020 11:25 pm
(@admin)
Member Admin

You will need to wire them like described in the bottom of this document.

Plus and minus of the total system does not matter, but they need to be wired so they alternate North-South as you can see. 

The crimps of the coil wires are color coded, but if you are unsure you can use a compass and test one magnet at the time. 

You can attach a file or just link to pics on some other place.

This post was modified 2 weeks ago by admin
ReplyQuote
Posted : 12/01/2020 6:58 pm
 -ww-
(@ww)
Member

Telma Hub Dyno

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Posted : 17/01/2020 11:57 pm
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