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MAHA LPS2000 conversion

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(@danny_530)
Member

Hi guys,

I've got a MAHA LPS 2000 2WD double roller dyno that I want to convert to yourdyno. I will bring it to my premises next week.

Is a single brake version, in the manual is stated that needs 230v and it has a 16A fuse (in other manuals says needs 20A though), anyway I'm almost sure this one needs 400v three phase supply (I guess they've built different setups), so I'm thinking about switching to yourdyno power supply as well, to keep things easy while modding to run it with 220v single phase supply.

I'm just wondering how much current yourdyno power supply draw, if I can estimate it based on calculation of brake current draw at 192V.

 

Second question is about the rotation direction. 

Because of the space, it would be best to run FWD in one verse and RWD in the opposite one, to save space behind the dyno. I know that some load cells works both in extension and compression, just swapping signal wires. But what about the rest that's involved? I mean, that rollers are not linked between "front" and rear ones and brake is fitted on "front"one, supposing vehicle tends to climb on them. Would it makes any difference while the inverted verse would supposedly push the wheel down and onto the "free" rollers? ( tyre deformation considered, of course).

Anything should tehorically impact on brake calibration on software?

Anyone tried to run its dyno both rotation verses?

 

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Topic starter Posted : 04/01/2021 9:20 am
(@danny_530)
Member

Finally I've brought it to my premises.

I'm trying to understand how the brake control works, to see how to make it working with yourdyno.

Anyway looks quite a lot of stuff, because it has boards for sensors, fan control, and so on.

 

 

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Topic starter Posted : 31/01/2021 2:50 pm
(@danny_530)
Member

Pic1

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Topic starter Posted : 31/01/2021 7:39 pm
(@danny_530)
Member

Pic2

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Topic starter Posted : 31/01/2021 7:40 pm
(@danny_530)
Member

Pic3

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Topic starter Posted : 31/01/2021 7:56 pm
(@danny_530)
Member

Pic4

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Topic starter Posted : 31/01/2021 8:10 pm
(@danny_530)
Member

Pic5

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Topic starter Posted : 31/01/2021 8:16 pm
(@danny_530)
Member

Last

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Topic starter Posted : 31/01/2021 8:37 pm
(@admin)
Member Admin

Hi,

Lots of electronics there that you can just toss in the bin when you do the upgrade. You can reuse the load cell and possibly the RPM sensor (needs to be hall effect type or encoder type). Send a pic of the RPM sensor and I can advise.

Then about the power supply. Pic4 is the backside of the SCR bridge, but there needs to be a separate board controlling it. If the control signals come from the main board, then you need a YourDyno power supply too. 

Most eddy brakes consume about 20 amps of current at 192V DC. This translates to a bit less than that on the AC side. You should go with 1 phase, that is the standard. 

So send a few more pics and we can see what you need.

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Posted : 31/01/2021 8:50 pm
(@danny_530)
Member

@admin control signals, seems to be those 4+1 grey wires that comes from board in pic2.... That is one of the boards installed on the "main" board...

Yeah I was pretty sure it was a big "hardcoded" system 

Tomorrow I'll send a pic of the load cell (it's a bar type, I'm thinking to swap it and try to make the system capable to run vehicles in both rotation direction)... RPM sensor I'm afraid is VR, I'll also check it (and wheel teeth number)

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Topic starter Posted : 31/01/2021 11:30 pm
(@danny_530)
Member

Classic MAHA bar type load cell

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Topic starter Posted : 01/02/2021 8:22 am
(@danny_530)
Member

RPM sensors (there are two, one per roller axle ... ) 

Most def are VR, two wire....

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Topic starter Posted : 01/02/2021 8:46 am
(@danny_530)
Member

Wheels are 100 teeth

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Topic starter Posted : 01/02/2021 8:56 am
(@danny_530)
Member

OK, I'll machine one of them to make a 20 teeth wheel from it, with dimensions suggested in "RPM wheel" wiki area

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Topic starter Posted : 01/02/2021 9:20 am
 Jay
(@vishara-jyasekara)
Member

Hi danny_530 

We have a Chassis dynamometer Maha LPS 2000 with eddy current brakes which is not in operational condition. Has problems with its electronics controls (Main board). Rest of parts are in good shape. We planning to replace the electronics with a new system and software. It would nice if you can share your experience. Did you use a YourDyno instrumentation kit and YourDyno power supply? Is it compatible? if so was it hard to do the conversion? 

Specifications of what we have 

Manufacturer / Model : MAHA LPS 2000

Operational voltage : 230V,

Roller Set: R100/1 Passenger car/van

Eddy-Current brake: 1x 260kW

Voltage : 0V-190VDC / 16A

 

Thank you,

Jay

 

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Posted : 16/07/2021 4:11 pm
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