ESC controlling the pump?

[SmallHaul]

Does anyone have a link to running the hydraulics using an esc? I assume you would use 3 mixes (on a front end loader) to the esc channel? or is it more simple than that?:confused:

[Markus]

Hi Scott,

One solution is to use a mixer.
Whenever you use a hydraulic function, the mixer is sending a signal to the ESC.
But this solution needs one channel.
Unfortunately I do not have a link how to program the mixer.

Other solution is to use electronic hydraulic switches (eg. Servonaut BMA (http://www.servonaut.de/shop/product_info.php?info=p23_servonaut-bma.html) or Brixl Oeldruckschalter (http://www.brixlelektronik.de/oeldruckschalter.htm) - Sorry both sites are in German).
Both systems are between the receiver and the hydraulic servo and can check four (4) servos.
Whenever there is s signal to the servo the module is switching on the hydraulic motor.
At both systems you can adjust a time period the motor is running after the last signal to the servo.

Hope this is what you was looking for.


Cheers,
Markus

[egronvold]

Does anyone have a link to running the hydraulics using an esc? I assume you would use 3 mixes (on a front end loader) to the esc channel? or is it more simple than that?:confused:

Im using some cheap 30A ESCs from hobbyking.com (they are originally made for aircrafts).

[aseejr]

Scott,

On my Wedico ADT instead of using ESCs I used this receiver controlled switch:

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8833

First I tried using 1 of the above switch. Using a DX8, programmed 2 mixes (steering to switch and dump to switch). The issue with this is that you CANNOT have both of mixes turned on at the same time (when you do, the 1st mix makes the 2nd in operable). What I did to make it work was to program the first mix into flight mode 1 and the second mix into flight mode 2. But this meant I always had to toggle between the flight modes.

The solution I found was to install 2 of the above switch, plugged into 2 separate channels. Programmed 2 mixes, steering to switch 1 and dump to switch 2. Now the hydraulic pump only turns on when I activate the steering and dump channels.

I also tried cheating - installed 1 switch - plugged it in to 2 separate channels using a 'Y' (2nd lead was only the signal wire). Didn't work...back fed signal....caused the whole thing to glitch.

Albert

[SmallHaul]

Thanks Markus, the servonaut switch sounds great if you can even set how long it runs since the last signal.

Egronvold, thanks for the info.

Thanks Albert, that is interesting that one mix cancels another.

Lots of great info here! I'll see what I can come up with using all of this.

[doodlebug]

Hey aseejr, Question? Can you put diode's in the signal lines, for channel isolation, and
try the mixing again.
Later, Neil#2 aka doodlebug.

[rc_farmer]

I am using this Banebots ESC/mixed with all my functions so the pump only runs when activated by the selected swithch

http://banebots.com/pc/ELECTRONICS/BB-0309

[aseejr]

Hey aseejr, Question? Can you put diode's in the signal lines, for channel isolation, and
try the mixing again.
Later, Neil#2 aka doodlebug.

I need to try this. All I know about diodes is that they only let current in this case signal to in one direction....but is there different ones available....if so which one should I use?

I'll head to our local electronics store this weekend.

Albert

[doodlebug]

Hey aseejr, I don't think the voltage rating has to be higher than 12 volt's on the high side spec's. Just a brain cramp for your "y" harness. Hope it help's! 1N914?, hope my memory is correct, the package should have the spec's on the back.
Later, Neil#2 aka doodlebug.

[Snochaser]

I am using this Banebots ESC/mixed with all my functions so the pump only runs when activated by the selected swithch

http://banebots.com/pc/ELECTRONICS/BB-0309

So do you need one for each servo in the block (in my case 4)? Or just one for the whole block? How is it wired in?

Ben

[doodlebug]

Hey Ben, just one esc, but controlling it is the trick, aseejr is playing with a "y" mixing harness. Hope to hear on the result's soon! Some of the guy's have radio's that do the mixing. And well, I'm still learning too.
Later, Neil#2 aka doodlebug.

[egronvold]

As for the Leimbach system, it seems there's little difference in strength when it comes to the pump's speed. Here's a little test I did yesterday: http://www.youtube.com/watch?v=aqNTPp1g4pE

[pugs]

Yes, you'll be producing pressure almost instantly when the pump starts to move, but you won't have full flow till its up at full speed. In the interest of saving battery juice, both the switch controlled and ESC controlled pump are good options. Could think of the ESC/wixed as a load sensing system that only pumps whats, needed, when needed which will also help with heat generation (so will the switch controlled). Being that the valves are variable flow, the switch controlled should give the best performance. Meaning the valve spool position is more of a linear relation ship to the speed of the cylinder being moved, where as with a varible speed pump and a variable valve, the relationship is more arc'd.

The best IMHO, and not sure if possible, would be to have the pump shutoff when not being used like the switch does, then when called for it ramps up speed, such that say 1/4 of stick movement and its at full speed. Would still give you some really slow movement for detail stuff but a more predictable movement at anything over 1/4 stick.

[Snochaser]

Great demo Jeff. Could you educate me (us) as to how I (we) would "wire" that in with the 4 servos I will be using? Does that require mixing?

Ben

[pugs]

That I'm not sure how to do yet. Can channels be mixed in a non 1:1 ratio?

So far the nicest switch I see is the Brixl one. Has programmable delay before shutoff.
http://www.brixlelektronik.de/oeldruckschalter.htm

[SonoranWraith]

That I'm not sure how to do yet. Can channels be mixed in a non 1:1 ratio?

So far the nicest switch I see is the Brixl one. Had programmable delay before shutoff.
http://www.brixlelektronik.de/oeldruckschalter.htm

Brixl stuff is definitely first class. Someday maybe I'll run one of their radios.

[egronvold]

That I'm not sure how to do yet. Can channels be mixed in a non 1:1 ratio?


I guess most computer radios can do that.

[rc_farmer]

Hey Ben, shoot me a PM and tell me exactly what you are trying to do. I think i have an idea of your goal. Maybe I can help ya. Also what radio are you using?

Rob

Great demo Jeff. Could you educate me (us) as to how I (we) would "wire" that in with the 4 servos I will be using? Does that require mixing?

Ben