Feather weight speed controllers

[philip_taylor]

Feather weight speed controllers

Thank you. It is good to be able to hear of others experience.

[typhoon_driver]

Feather weight speed controllers

No problem Paul. I was just passing on my experience with the controllers. They handled beautifully when they worked in hornet.

[woody]

Feather weight speed controllers

Only blew one of them for the first time this weekend and even then its only the relay which will take a half hour to replace.

As Paul has said in the other thread ...Gary, there is has to something a miss with your set up that is causing the problem with the Sabretooth but no idea what

Was it the same drive side blown each time the controller failed?...if so Id suggest you replace the drive & motor that the burnt Electronize relay was supplying.

[leorcc]

Feather weight speed controllers

I run 2 Graupner speed 900s on 13.1V and 24V on the Scorpion XXL without any problems whatsoever, no matter what pushing match i was in with any feather of ours.

[woody]

Feather weight speed controllers

It is all about matching motors & gearing to the controller.
Leo appears to have got it right.

My XXL however isnt a match for my present motors and current limits constantly.

Investigation of my drill motors via the web ( based purely on can dimensions and voltage ) suggest that they may well have a stall current exceeding 100 amps@ 18v ....Im running 24v.

http://www.mabuchi-motor.co.jp/cgi-bin/catalog/e_catalog.cgi?CAT_ID=rs_775vcwchttp://www.mabuchi-motor.co.jp/cgi-b..._ID=rs_775vcwc

Time to change motors me thinks....

(Message edited by woody on May 26, 200

[m2xt]

Feather weight speed controllers

No problem Gary and as you stated in your experience. Current limiting when implemented in software has an execute time that can be slower than peak rush current. I wonder if your reversing currents exceed the peak rating of the MOSFETs and they pop. In the Electronize, excessive reversing current takes out the relay first. Or as Woody suggests, maybe a motor on its way out.

Woody, 100A stall - ouch! One reason why I shy away from recommending specific speed controllers for drill motors as their full performance is rarely known.

[leorcc]

Feather weight speed controllers

Speed 900s give 65A stall current @12V. We measured about 20A onder load on a 9:2 gear ratio and 70mm wheels in both Hannibalitos.

We do use active cooling on ours though. The scorpions are in a box with 2 small fans, 1 blowing in the box from one side and 1 drawing the air out from the other.

We also ran 4 speed 900s on 24V on 2 XXLs with a 6:1 ratio and 100mm wheels, where we drew so much the battery packs started melting but the XXLs never blinked once. We never stalled that one though.

[tom_kane]

Feather weight speed controllers

Sabertooth or Scorpian XXL?

The numbers say Sabertooth but what is everyones view in practice?

Which one is performs better?

[leorcc]

Feather weight speed controllers

Personally, I dont think there is much difference between them. I will say that I dont like the way Robotpower makes the XXL, but we do our own version of upgrade that is a lot better.

(Message edited by leorcc on June 03, 200