Why does my motor only rotate backwards?

Brushless, lipo, spectrum, etc...

Moderators: scr8p, klavy69

Post Reply
mamadoesntletme
Approved Member
Posts: 542
Joined: Thu Dec 02, 2010 3:03 am
Location: Japan
Has thanked: 2 times
Been thanked: 16 times

Why does my motor only rotate backwards?

Post by mamadoesntletme »

After calibrating a Speed Passion GT 2.0 Pro sensored ESC with a Viper motor it will only run reverse and I don`t know why..

I´ve tried another sensor cable, another motor, calibrate it with the radio in ¨rev¨ instead of normal..

If it were sensorless I would just swap the motor wires, but I can`t because it is sensored.

Any idea about why the motor only runs reverse?

User avatar
integra22t
Approved Member
Posts: 637
Joined: Fri Aug 09, 2013 1:36 pm
Location: Kingston On.Ca
Been thanked: 2 times

Re: Why does my motor only rotate backwards?

Post by integra22t »


User avatar
GoMachV
Approved Member
Posts: 11158
Joined: Sun Apr 29, 2012 10:31 pm
Location: Twin Falls, ID
Has thanked: 744 times
Been thanked: 2148 times

Re: Why does my motor only rotate backwards?

Post by GoMachV »

He is running sensored tho, and per the same manual it says you cannot change the orientation of the wires in sensor mode
It's time to stand up to the bully. Support the companies that support the industry, not the ones that tear it down. Say no to Traxxas
Factory Works website

Kyoshojoe
Approved Member
Posts: 210
Joined: Thu Feb 20, 2014 6:22 pm
Location: Sarasota, FL

Re: Why does my motor only rotate backwards?

Post by Kyoshojoe »

You probably need to change the motor direction in the esc program settings. I would try swapping A and C wires if you can't change direction. Shouldn't hurt anything to try.

User avatar
GoMachV
Approved Member
Posts: 11158
Joined: Sun Apr 29, 2012 10:31 pm
Location: Twin Falls, ID
Has thanked: 744 times
Been thanked: 2148 times

Re: Why does my motor only rotate backwards?

Post by GoMachV »

Guys, please be careful when recommending things that are specifically warned in the manual- I would hate to see someone try swapping wires and having an expensive issue. Yes, this is procedure on a sensor less but NOT on sensored

That said, have you tried using the servo reversing on the transmitter and recalibration the speed control?
Attachments
image.jpeg
It's time to stand up to the bully. Support the companies that support the industry, not the ones that tear it down. Say no to Traxxas
Factory Works website

User avatar
RC10th
Approved Member
Posts: 4209
Joined: Sat Feb 16, 2013 9:51 am
Location: Australia
Has thanked: 36 times
Been thanked: 934 times

Re: Why does my motor only rotate backwards?

Post by RC10th »

The only time I've heard of successfully changing the direction of a sensored motor (that doesn't have a rotation setting) is swapping A and C, but also reversing the pins of the sensor cable. Caution should be exercised here as most performance sensored motors have built in timing, you'd need 0* timing or a way to retard timing which would advance it for opposite rotation.

None of this is recommended however, and as always if it doesn't work properly straight away - stop.


Edit: reading the manual Jeff posted above it appears you can change direction with the reverse switch. From experience sometimes it works, sometimes not, just depends on ESC. Check forward/brake/reverse operation to confirm that your not using the "reverse" circuitry for "forward"
I was old school - when old school wasn't cool !

User avatar
Coelacanth
Approved Member
Posts: 7348
Joined: Thu Jul 29, 2010 6:20 pm
Location: Alberta, Canada
Has thanked: 16 times
Been thanked: 270 times

Re: Why does my motor only rotate backwards?

Post by Coelacanth »

Note that this is for a sensorless system, but I had a similar issue where the motor only had reverse, and brake. It didn't rotate forward. I discovered the ESC was still set to "Forward/Brake" mode, not "Forward/Brake/Reverse" mode. I doubt if that's your problem but couldn't hurt to mention it, because the symptoms were similar.
Completed projects: CYANide Onroad Optima | Zebra Gold Optima | Barney Optima | OptiMutt RWD Mid
Gallery - Coel's Stalls: Marui Galaxy & Shogun Resto-Mods | FrankenBuff AYK Buffalo | 1987 Buick GNX RC12L3

Kyoshojoe
Approved Member
Posts: 210
Joined: Thu Feb 20, 2014 6:22 pm
Location: Sarasota, FL

Re: Why does my motor only rotate backwards?

Post by Kyoshojoe »

Let's not forget that a terminal on speed passion esc may not be the corresponding a terminal on the viper motor. There is no industry standard to insure a goes to a and so forth. Chances are swapping motor wires to check this will do no harm but you should always be careful

mamadoesntletme
Approved Member
Posts: 542
Joined: Thu Dec 02, 2010 3:03 am
Location: Japan
Has thanked: 2 times
Been thanked: 16 times

Re: Why does my motor only rotate backwards?

Post by mamadoesntletme »

Yesterday I tried with a different radio, a KO Propo. And tried also re-calibrating the ESC in `rev` position, but nothing..

After that, since I have a spare ESC (another Speed Passion which I had on my Losi XX that worked perfectly) I fitted the B44 with Schelle conversion kit (the one that was running backwards) with this new ESC, and It also was running backwards. So it makes me think that there is nothing wrong with the ESC`s, I suspect that made something wrong building the B44 with the shorty conversion kit.
But I wonder what it may be..

Added: Looking at the b44.3 manual, I think I know what it is...

User avatar
RC10th
Approved Member
Posts: 4209
Joined: Sat Feb 16, 2013 9:51 am
Location: Australia
Has thanked: 36 times
Been thanked: 934 times

Re: Why does my motor only rotate backwards?

Post by RC10th »

Backwards diffs? I thought they normally have a molded pin so you couldn't install them backwards.
I was old school - when old school wasn't cool !

mamadoesntletme
Approved Member
Posts: 542
Joined: Thu Dec 02, 2010 3:03 am
Location: Japan
Has thanked: 2 times
Been thanked: 16 times

Re: Why does my motor only rotate backwards?

Post by mamadoesntletme »

RC10th wrote:Backwards diffs? I thought they normally have a molded pin so you couldn't install them backwards.
Exactly, backwards diffs.

In the "little" Schelle manual its says you have to remove that molded pin, but since I didn`t pay much attention to the manual..I made the mistake of leaving the diffs as they were originally.

Thanks to everyone! There was no problem with the Viper motor, or the radio, or anything, it was me :?
I´m happy now I didn`t swap the motor wires.

User avatar
Coelacanth
Approved Member
Posts: 7348
Joined: Thu Jul 29, 2010 6:20 pm
Location: Alberta, Canada
Has thanked: 16 times
Been thanked: 270 times

Re: Why does my motor only rotate backwards?

Post by Coelacanth »

Interesting. I guess since you didn't mention anything about the car model, nobody could've guessed the problem. :)
Completed projects: CYANide Onroad Optima | Zebra Gold Optima | Barney Optima | OptiMutt RWD Mid
Gallery - Coel's Stalls: Marui Galaxy & Shogun Resto-Mods | FrankenBuff AYK Buffalo | 1987 Buick GNX RC12L3

mamadoesntletme
Approved Member
Posts: 542
Joined: Thu Dec 02, 2010 3:03 am
Location: Japan
Has thanked: 2 times
Been thanked: 16 times

Re: Why does my motor only rotate backwards?

Post by mamadoesntletme »

Coelacanth wrote:Interesting. I guess since you didn't mention anything about the car model, nobody could've guessed the problem. :)
Yes, I am sure that if I had said it was a shorty conversion someone would have said something like " check if you have build it correctly"..

Thanks !

Post Reply

Create an account or sign in to join the discussion

You need to be a member in order to post a reply

Create an account

Not a member? register to join our community
Members can start their own topics & subscribe to topics
It’s free and only takes a minute

Register

Sign in

  • Similar Topics
    Replies
    Views
    Last post

Return to “Modern Electronics”

Who is online

Users browsing this forum: No registered users and 14 guests