Programming Otto Bock C2000

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Re: Programming Otto Bock C2000

Postby Burgerman » 18 Sep 2018, 23:06

0.057 ohm, 57mOhm but you are then supposed to add some for cables, say 40mOhm, and then set .6 or .7 of that according to pg. Idealy you need a GOOD low impedance capable meter. I would still suggest the batteries.

Or possibly a global OEM level scaler as in the Dynamic software. In that theres a turn and forward and reverse scaler. Set to 25%. If you set it to 50% you double the acceleration that a user setting of 100 has. Maybe theres a similar thing available in the curtis instruments software. I would like to look throught the settings file here! Hopefully you are not refering to the one above? *** There are also settings fo smoothing speed change transitions that cause delays when you hit go! And additional settings that speed up or slow down initial starting and stopping.

Scrap most of that. It has very few settings! Just looked at the file above.

*** the one above has forward acceleration set very low, also has 20% deadband, also has 30% tremor damping... Just to begin with. Thats like pushing go and then waiting for a bus to turn up.
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Re: Programming Otto Bock C2000

Postby max78 » 19 Sep 2018, 08:17

I have two motors and using both channels. I think the motors should be strong and low ohm.

It’s not my config file.
I have all Accel at 100%, Decel at 90%, Power at 100%
Deadband at 10%, Tremor at 0%
and 80mOhm

It Brakes twice as hard as it Accelerates. About 0,4g Acceleration und 0,8g Decel.

Yes it’s my problem that there are only very few settings shown. In the parameter file are much more. I think the other will need higher access level.
I’ll try if I can change some of this. (But it will take time to get the adapter)
From the technical data the controller is really good, but if there are no settings it’s a big problem.
I don’t know if it has combined or each channel 130A?

Roboteq would be best, but in combination with a joystick it’s a lot of work and not really cheap. The Brushless version would be best, but I don’t know any motor with gearbox….

Better batteries would be great. But I think it’s not the main problem. I have MK Gel.


Thanks, Max
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Re: Programming Otto Bock C2000

Postby woodygb » 19 Sep 2018, 08:25

The T74 motors mOhm's can be calculated from their stall amps.

Image

24v divided 210 amps = 114 mOhms then add a bit for the wiring.
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Re: Programming Otto Bock C2000

Postby Burgerman » 19 Sep 2018, 08:50

If thats correct then they are not very low impedance motors. Not my choice. Are you sure thats measured at 24V (looks like 12). Because that means that when you hit "go" and jam the stick forwards, you wont get max torque until the pulsewidth has climbed to the controllers 50% point. So is set to go from 0 to 6mph in say 3 seconds then you will wait at least 1 second before much happens. Thats the same as many 2 pole motors.

Heres the thing.

I can feel the affect of BRAND NEW FULLY CHARGED MK batteries, as like an elastic band. I dont like MK batteries because they will not allow me to have good turn or control, or good acceleration once the chair is programmed to respond instantly. It feels as if the joystick is "unreliable"... Doesent go where or when I tell it. So for me, MK are rubbish.

Swapping those for a set of Odyssey, makes a huge difference. Esp so after an hour of hard use. But you refuse to accept this. I know that this is one big part of your problem. I can make the battery voltage drop by 5 or 6 volts down to 18V with one tiny hop, as shown on that video above. If I do this for 10 or 20 hard turns and accelerate between turns, or 10 mins or darting about as you do in soccer, then they continually drop to 16V at every turn, and every acceleration. Why does that matter? Because the moment the controller sees these 16 to 17V drops it REDUCES power automatically to protect the battery, and to be sure it remains in "control" to be safe. (not black or brown out). You will be seeing that happen continuously.

I KNOW that you will be getting way less than max power after the first 2 seconds of use. Lead batteries are rubbish. Odyssey have HALF the voltage drom under load than MK. Thats because they are half th impedance. And MK are better than most others. Lithium are way way better here! No peukert.

And yes:

Yes it’s my problem that there are only very few settings shown. In the parameter file are much more. I think the other will need higher access level.


Its a basic control system. If thats REALLY a OEM level tool you have, then thats it. You dont have access and wont get access to anything better. Although I have seen Curtis instrument controllers with very in depth settings that went way further. That is only part of your problem though.
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Re: Programming Otto Bock C2000

Postby max78 » 19 Sep 2018, 09:06

Thanks, a lot for all the information.
Which controller and motors and gearbox do you recommend?
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Re: Programming Otto Bock C2000

Postby Burgerman » 19 Sep 2018, 09:45

Motors, anything with around 40 to 45mOhm impedance. And any controller with a lot of programmable parameters. Maybe 120 r-net but beware of temperature adjustments. You cant raise the temp foldback temp so you will need a good fan aimed at the side where the cables are. But you need that fan anyway. And so low peukert, low impedance batteries.

Although there is a tiny delay on the r-net too. Thats the speed the ones and zeros get processed before the stick movement results in some action. But it still what I would go for.

P.S. Counter intuitive info...
The lower impedance the motors are, the less trouble they give the battery. So a motor with a very high stall current, (Remember Amps = torque) will actually take less Amps at the battery. A motor with 40mOhm takes HALF the battery amps at the same torque level, same acceleration level, as an 80mOhm motor does... Which is why I know your MKs wont keep up. If you want to understand why that is feel free to ask. As it takes a lot of writing, so new post!
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Re: Programming Otto Bock C2000

Postby woodygb » 20 Sep 2018, 08:48

curtis hacked.jpg
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Re: Programming Otto Bock C2000

Postby Burgerman » 20 Sep 2018, 08:55

Thats what I was talking about. He doesent seem to have that, aparently, hence:

If thats REALLY a OEM level tool you have, then thats it. You dont have access and wont get access to anything better. Although I have seen Curtis instrument controllers with very in depth settings that went way further.


Above...
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Re: Programming Otto Bock C2000

Postby woodygb » 20 Sep 2018, 09:00

Markus has discovered a way around altering the hidden parameters ..this is HIS modified file.


Note:-
There are 11 distinct valid access levels, many of which are copies with less access than the full level.
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Re: Programming Otto Bock C2000

Postby Burgerman » 20 Sep 2018, 11:22

Where? The image? Or missing link?

There may be 11 levels. Some are between the 4 allowed by the software (user, dealer, service, oem) and there are some that are intended for curtis only, and that change stuff like servo/dual or single channel use, or that change controller scalersettings and a load of stuff that are beyond anyone but the curtiss electronics/programmer dude that was the designer...

Which we dont normally get access to. Probably a good thing if not used with much care!
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