Puma 40 Tilt Sensor

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Puma 40 Tilt Sensor

Postby js1971 » 17 Jan 2018, 20:33

As you may be aware I have changed the COG on my chair to help on the hills around our house and when I used the chair I tried to change the tilt on the chair to find it would only go about 5mm then stop- I was then unable to change it again until I got the chair home in to the kitchen and stop and start it again.

Im assuming its because of a limit sensor or some setting I need to change within the programming, or indeed do I need to move the sensor - or have it just broken it !

Many thanks
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Re: Puma 40 Tilt Sensor

Postby Burgerman » 17 Jan 2018, 21:36

Well only you are in the position of being able to figure out whats wrong as you have the chair. But it will be one of the above!
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Re: Puma 40 Tilt Sensor

Postby js1971 » 17 Jan 2018, 21:41

Burgerman wrote:Well only you are in the position of being able to figure out whats wrong as you have the chair. But it will be one of the above!


Indeed - I was hoping someone might have had this before and say ah yes, you moved COG therefore check x - as im still wet behind the ears with this!
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Re: Puma 40 Tilt Sensor

Postby Burgerman » 17 Jan 2018, 21:54

Doing what you have should not change tilt at all. Depending on exctly what you have done. So take a look at cables getting in the way of proper movement or being trapped or anything else obvious.
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Re: Puma 40 Tilt Sensor

Postby js1971 » 17 Jan 2018, 22:12

I took the seat cushion off and loosened the 4 screws (next to the measure guide) and moved them form 10 to 6 and put back on so like you say nothing that should cause an issue- but I will check all cables etc and see if ive dislodged something -thank you
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Re: Puma 40 Tilt Sensor

Postby rover220 » 17 Jan 2018, 22:34

There is no tilt sensor. Probably need to up the amp limit on the tilt as you've moved weight rearward.
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Re: Puma 40 Tilt Sensor

Postby Burgerman » 17 Jan 2018, 22:37

Wouldnt that make tilt easier (less amps)?
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Re: Puma 40 Tilt Sensor

Postby rover220 » 17 Jan 2018, 22:42

Burgerman wrote:Wouldnt that make tilt easier (less amps)?


I've had a few pints and can't compute but I'd put money on the amp limit needing lifting. See it often.
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Re: Puma 40 Tilt Sensor

Postby Burgerman » 18 Jan 2018, 00:53

beer beer beer :joint cheers urinal
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Re: Puma 40 Tilt Sensor

Postby js1971 » 18 Jan 2018, 10:29

rover220 wrote:
Burgerman wrote:Wouldnt that make tilt easier (less amps)?


I've had a few pints and can't compute but I'd put money on the amp limit needing lifting. See it often.


Many thanks

Will wait for my OEM kit to arrive in that case!
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Re: Puma 40 Tilt Sensor

Postby Burgerman » 18 Jan 2018, 10:40

That may be it. But I think alcohol may have confused. Sitting further back would either make no difference or reduce the effort (amps) needed to tilt. Depending on exactly what you moved. So its still worth looking very carefully at things. Does it work without you in it?
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Re: Puma 40 Tilt Sensor

Postby js1971 » 18 Jan 2018, 14:14

Burgerman wrote:That may be it. But I think alcohol may have confused. Sitting further back would either make no difference or reduce the effort (amps) needed to tilt. Depending on exactly what you moved. So its still worth looking very carefully at things. Does it work without you in it?


Whether im in it or not, moving the joystick, the chair will tilt back a very small amount (maybe 4-5mm movement) then stop, if I release the joystick until the solenoid clicks, I can do it again, after 4-5 attempts at this it will then tilt right back. then it I continually tilt back and forrh its fine. If I leave for 1/2 hour or so then do it again I have the same issue
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Re: Puma 40 Tilt Sensor

Postby Burgerman » 18 Jan 2018, 15:45

Are you sure that the mechanism isnt binding or hitting something due to the rearward seat move? Because it will see current rise, and think its reach end of travel.
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Re: Puma 40 Tilt Sensor

Postby rover220 » 18 Jan 2018, 16:43

What's the seat depth. If seat is deep and cog is moved too far back it can collide with the frame when tilting. Not normally a problem on fwd though usually only rwd
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Re: Puma 40 Tilt Sensor

Postby js1971 » 21 Jan 2018, 22:25

the seat cushion depth is 19", it doesn't go beyond the plastic barrier at the back of the seat board.
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Re: Puma 40 Tilt Sensor

Postby Burgerman » 22 Jan 2018, 01:21

Look under the seat. Check tilt/lift/recline mechanism isnt hitting anything.
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Re: Puma 40 Tilt Sensor

Postby greybeard » 22 Jan 2018, 14:23

Does your backrest recline? If so, recline it so you're laid right back and then try the tilt. If it works like that, then you probably have the same fault as my Puma that others here have diagnosed as having a failing tilt actuator that needs replacing because it now lacks the power to lift your full weight.
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Re: Puma 40 Tilt Sensor

Postby Burgerman » 22 Jan 2018, 16:07

In which case that can often be fixed by increasing the amps allowed as previously mentioned.
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Re: Puma 40 Tilt Sensor

Postby greybeard » 22 Jan 2018, 18:48

Gotcha. Somehow managed to completely miss that bit of the thread.

Anyone know if this can be done using R-net OBP or does it require the dongle?
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Re: Puma 40 Tilt Sensor

Postby rover220 » 22 Jan 2018, 20:13

greybeard wrote:Gotcha. Somehow managed to completely miss that bit of the thread.

Anyone know if this can be done using R-net OBP or does it require the dongle?


Needs oem for amp limits
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Re: Puma 40 Tilt Sensor

Postby greybeard » 22 Jan 2018, 23:47

Thanks, Rover.
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Re: Puma 40 Tilt Sensor

Postby ex-Gooserider » 23 Jan 2018, 01:12

Interesting idle question.... It seems that the current on an actuator will vary as it moves through a cycle, where the demand will vary depending on the exact mechanics of the chair in question.... My understanding is that currently there may be an amp limit on how much current an actuator gets, but it always gets the same voltage...

Given that many times a gripe with our chairs is that the actuator stuff is slow - especially seat lifts, standing, etc. Since voltage determines speed, I'm wondering if one could get a speed increase by using a lower voltage actuator and a motor controller that is current limited to the maximum Amp rating of the actuator... Basically the same thing BM is doing with the motors on the BM3....

I'd note that another advantage of doing this if using aftermarket actuators is that my experience is that it is far easier to get 12V rated actuators than 24V...

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Re: Puma 40 Tilt Sensor

Postby Burgerman » 23 Jan 2018, 02:07

Yes you could. Unless they are already borderline heat overloaded. A seat lift cant get that hot in 10 secs instead of 20 though can it?

With r-net you can set actuator acceleration, deceleration, max current, error inhibit, and position inhibit 4 sectors, as well as speed. So if you were to use an actuator rated at a lower voltage, you could reduce speed (volts) to match and get the same performance as stock. Or increase it. Or go somewhere in between. So increase speed or volts by say 50 percent over rated voltage. And to be nice to it, reduce acceleration and deceleration.
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