Truck going backwards - not a wiring issue

[yoavba]

Hi,

I've just completed the electronics setup of my new RC4WD Gelande II D90.

The item I use are:

RC4WD 35t motor
Hobywing Quicrun 1060 ESC
Futaba 3PL transmitter/receiver

Now here is the problem:

When I move the throttle forward, the car goes forward at a certain speed.
When I move the throttle reverse, the car goes backwards, but at a much greater speed than when it goes forwards.
Also, for the truck to move forward ,the motor's shaft goes clockwise when viewed from the front looking at the pinion. I know this is not what should be normally happening with normal-rotation motors.

When I googled this issue I came across a surprisingly small number of people asking about it. One was advised to flip the ring gears in the differentials. Another was told he should flip the functionality in the transmitter and then to flip esc-to-motor wiring.

While at least the first suggestion makes some sense and would probably work, I find it hard to believe that the kit was designed with such a fundamental flaw (It doesn't say anywhere that the kit is design to work with a reverse rotation motor).

I would love to hear what you guys think.

Thanks.

 

[WHITE-TRASH]

Reverse the #2 channel on the radio. And reverse the wires on the motor.

If the esc can be programmed for direction itself then that is the way to do it properly. Reversing channels works but it's kind of a bandaid if the esc is backwards.


Speaking of which, you programmed the radio and esc together right?

 

[yoavba]

Reverse the #2 channel on the radio. And reverse the wires on the motor.

If the esc can be programmed for direction itself then that is the way to do it properly. Reversing channels works but it's kind of a bandaid if the esc is backwards.


Speaking of which, you programmed the radio and esc together right?

Thanks WHITE-TRASH.

My ESC is pretty basic and doesn't have much programming options other than enable/disable braking and reverse.
As for reversing channel 2 and the esc-to-motor wiring, Even if I do that I will still have my motor spinning in the wrong direction (CW insteead of CCW) most of the time, right?
This seems to be a significant issue because 1) Electric motors are designed to spin at a certain direction and b) The truck will still have greater speed going reverse.

 

[WHITE-TRASH]

Anymore motors are designed with zero timing especially rtr type sealed can motors so direction is irrelevant. I just re-read your first post. Reverse the radio and your done. Simple fix.

 

[yoavba]

Anymore motors are designed with zero timing especially rtr type sealed can motors so direction is irrelevant. I just re-read your first post. Reverse the radio and your done. Simple fix.

Got it. Thanks.

 

[curvedwallride]

I'm having a similar problem with my Trail Trekker, and I'm just going to flip the tranny, which is one of the recommended mods anyway. I put a new DDT Predator 90t motor in and I feel like it's just wired wrong by the guy who made it. Doesn't really bother me, but it's just a bit annoying.

 

[fyrstormer]

If it goes faster in reverse, then it IS a wiring issue.

 

[yoavba]

If it goes faster in reverse, then it IS a wiring issue.

As stated before, this could be solved by flipping the wires and then reversing channel 2 (which is what I ended up doing), But this would keep the motor spinning CW instead of CCW most of the time. Not a problem if your motor has no 'preferred direction' but definitely a problem in case the motor is designed to spin CCW.

 

[fyrstormer]

If the motor is designed to spin one direction and it's the wrong direction for your vehicle, then you need a different motor. Alternately, if you actually have the ability to flip the diff gears or even the entire transmission (neither of which are possible on the SCX10 v2, for example), then that also works. I'm not sure I've ever heard of a fixed-endbell motor that was set to any timing other than zero, though, with the sole exception of touring car stock motors. I just checked RC4WD to look at the specs for their disposable 35t motor, and it doesn't say anything about timing. Their rebuildable 35t motor is definitely adjustable, because all rebuildable motors with round cans are adjustable.

 

[yoavba]

If the motor is designed to spin one direction and it's the wrong direction for your vehicle, then you need a different motor. Alternately, if you actually have the ability to flip the diff gears or even the entire transmission (neither of which are possible on the SCX10 v2, for example), then that also works. I'm not sure I've ever heard of a fixed-endbell motor that was set to any timing other than zero, though, with the sole exception of touring car stock motors. I just checked RC4WD to look at the specs for their disposable 35t motor, and it doesn't say anything about timing. Their rebuildable 35t motor is definitely adjustable, because all rebuildable motors with round cans are adjustable.

So I take it that my motor has no 'preferred direction' and therefore the current setup I'm using should be fine.
Thank you.

 

[mikemcE]

Most speed controls use leds. Look at them. Yellow is neutral, green forward, red reverse . Adjust your leads for correct operation.
Futaba states with some brands of controllers , channel 2 needs to be reversed. I run Castle and Holmes, this is true for correct operation.


Hang up and Drive

 

[yoavba]

Most speed controls use leds. Look at them. Yellow is neutral, green forward, red reverse . Adjust your leads for correct operation.
Futaba states with some brands of controllers , channel 2 needs to be reversed. I run Castle and Holmes, this is true for correct operation.


Hang up and Drive

Too bad my cheap speed controller has a single red led that flashes when going either forward or reverse.
Thanks anyway.

 

[fyrstormer]

So I take it that my motor has no 'preferred direction' and therefore the current setup I'm using should be fine.
Thank you.

The easy way to check the "preferred direction" of a disposable motor is to look at the position of the electrical tabs on the endbell compared to the side vents in the motor can. If the electrical tabs are centered with respect to the side vents, then the timing is set to zero; if not, then the motor will rotate faster in the direction of the electrical tabs.

However, electric motors will always run slightly faster in one direction than the other, due to manufacturing inaccuracies. The effect is minor, but with a rebuildable motor you can correct it by adjusting the timing very slightly. Personally, I've never worried about it, because the ESC's reverse speed is so much lower than its forward speed that you'd never notice if the motor timing is slightly off-center.

 

[DeviledEggs]

Too bad my cheap speed controller has a single red led that flashes when going either forward or reverse.
Thanks anyway.

I have a 1060 and it definitely has a green led as wel as red. Pickup the HW programmer and make sure the esc is programmed right. IIRC I had the same issue the first time I set mine up.

 

[yoavba]

The easy way to check the "preferred direction" of a disposable motor is to look at the position of the electrical tabs on the endbell compared to the side vents in the motor can. If the electrical tabs are centered with respect to the side vents, then the timing is set to zero; if not, then the motor will rotate faster in the direction of the electrical tabs.

However, electric motors will always run slightly faster in one direction than the other, due to manufacturing inaccuracies. The effect is minor, but with a rebuildable motor you can correct it by adjusting the timing very slightly. Personally, I've never worried about it, because the ESC's reverse speed is so much lower than its forward speed that you'd never notice if the motor timing is slightly off-center.

My motor's timing is set to zero then.
Thanks.

 

[yoavba]

I have a 1060 and it definitely has a green led as wel as red. Pickup the HW programmer and make sure the esc is programmed right. IIRC I had the same issue the first time I set mine up.

That's weird.
Can you confirm that this is what you're using?
QuicRun WP 1060 Brushed_Car System_HOBBYWING | Welcome to Brushless System Trends -

 

[DeviledEggs]

^^ My mistake. I have the 10BL60, the brushless version. The led is red in reverse and at full throttle but green at partial throttle (fwd). It is my only HW esc but I dont see why the brushed 1060 would be any different there.

 

[yoavba]

^^ My mistake. I have the 10BL60, the brushless version. The led is red in reverse and at full throttle but green at partial throttle (fwd). It is my only HW esc but I dont see why the brushed 1060 would be any different there.

Well, I double checked and it turns out that the 1060 indeed has only a red led.