DIY Electric Car Forums banner

1 - 2 of 2 Posts

·
Registered
Joined
·
70 Posts
Discussion Starter · #1 ·
Hi all,

I have a 70A 24V Rhino controller that I tried to put into my kids
Gaucho jeep. Mainly to replace the switches that were there to
turn on the motors and to reverse.
Turns out the Rhino controller is programmed for a wig-wag throttle,
meaning 0kOhm - full backwards, 2.5kOhm neutral, 5kOhm full speed
forward. The controller also has many safety features that e.g. prevent
one to turn it on with the throttle full open. I have no wig-wag
throttle that would fit into the jeep and also would like to keep the
separate gear stick that activates a switch for reverse. The controller
has a nice ramp-up so going to full speed right away would be much
smoother than before. Hence I thought I could just use two 2.5KOhm
resistors to simulate the throttle pot and have one switch for forward
and another for reverse. Unfortunately the controller is smarter than me
and wont let me do it with switches.
I was hoping somebody might have a pointer to a simple and cheap circuit
that would let me simulate a wig-wag pot to the controller with two
switches. I.e. S1 being drive, S1 being reverse

S1 open - 2.5kOhm
S1 closed, S2 open - 5kOhm
S1 closed, S2 closed - 0kOhm

I tried this with a pot and simply shorted two legs together to simulate
S1 and/or S2 but the controller must sense this immediate short and goes
into failure mode. I suspect i need a gradual change.

Any thoughts?

Btw, reprogramming is not an option as a programmer tool is needed and
shipping it would be cost prohibitive, I dont want to invest a fortune
into the jeep, just thought an electronic controller would be better
than the stupid switches that are way overloaded and dont take the dirt
and sand well. Now that stupid controller is smarter than me. Darn.

Markus

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter · #2 ·
Hi Markus,

If you can get a 2.5kOhm pot, wire it in series with a 2.5kOhm resistor.
Attach the wiper to the controller as usual. Then have your
forward/reverse switch be DPDT, with the poles wired to the controller's
pot inputs (not the wiper). Wire the end of the resistor and the far end
of the pot to the switch, crossing over from one end of the contacts to
the other. Sorry for the bad description, but your connections will be:

controller_pot(-)----pole1
throw1(1)----throw2(2)----resistor(-)
resistor(+)----pot(-)
throw2(1)----throw1(2)----pot(+)
pole2----controller_pot(+)
pot(wiper)----controller_pot(wiper)

where

throw1(2) is the switch connection which is shorted to the first pole
when in the '2' position (reverse)
throw2(1) is the switch connection which is shorted to the second pole
when in '1' position (forward)

It's a little late, so let me know if this is too unclear.

Cory Cross

Markus Lorch wrote:

>Hi all,
>
>I have a 70A 24V Rhino controller that I tried to put into my kids
>Gaucho jeep. Mainly to replace the switches that were there to
>turn on the motors and to reverse.
>Turns out the Rhino controller is programmed for a wig-wag throttle,
>meaning 0kOhm - full backwards, 2.5kOhm neutral, 5kOhm full speed
>forward. The controller also has many safety features that e.g. prevent
>one to turn it on with the throttle full open. I have no wig-wag
>throttle that would fit into the jeep and also would like to keep the
>separate gear stick that activates a switch for reverse. The controller
>has a nice ramp-up so going to full speed right away would be much
>smoother than before. Hence I thought I could just use two 2.5KOhm
>resistors to simulate the throttle pot and have one switch for forward
>and another for reverse. Unfortunately the controller is smarter than me
>and wont let me do it with switches.
>I was hoping somebody might have a pointer to a simple and cheap circuit
>that would let me simulate a wig-wag pot to the controller with two
>switches. I.e. S1 being drive, S1 being reverse
>
>S1 open - 2.5kOhm
>S1 closed, S2 open - 5kOhm
>S1 closed, S2 closed - 0kOhm
>
>I tried this with a pot and simply shorted two legs together to simulate
>S1 and/or S2 but the controller must sense this immediate short and goes
>into failure mode. I suspect i need a gradual change.
>
>Any thoughts?
>
>Btw, reprogramming is not an option as a programmer tool is needed and
>shipping it would be cost prohibitive, I dont want to invest a fortune
>into the jeep, just thought an electronic controller would be better
>than the stupid switches that are way overloaded and dont take the dirt
>and sand well. Now that stupid controller is smarter than me. Darn.
>
>Markus
>
>_______________________________________________
>For subscription options, see
>http://lists.sjsu.edu/mailman/listinfo/ev
>

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 
1 - 2 of 2 Posts
Top