Wiring and grounding

5 years 11 months ago #29529941 by koffe
Wiring and grounding was created by koffe
Hello,
I am about to buy one brushed dc motor controller, the 2x120Amp.

My motors negative pole is connected to the outer part of the motor which is connected to the whole frame of the machine. (right now the frame is not connected to the negative side of the battery) My previous controller had a problem when I connected frame to the negative pole of the battery, because the controller was controlling the power with the negative line and then when I connected the frame to the motor, the motor had full throttle and the controller did not have any control..

So I wonder how this controller will react?
Is the chassi of the controller isolated?
Can I connect the frame to the negative pole of the battery?
Is there a difference between the controllers ground and negative line?

If this works, this controller looks really good.
Thank you,

Kristofer

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5 years 11 months ago - 5 years 11 months ago #29529942 by TechSupport
Replied by TechSupport on topic Wiring and grounding
I'm kind of confused by this, so lets' break this down to a simple question.

Which controller are you referring to, model. This will determine if you are talking about a brushed or a brushless motor.

All mid range and small controllers have bottom plates, these are not connected to the ground of the pcb assembly; therefore isolated. The SDC, SBL, controllers bottom plates are not anodized, but the rest are. The controllers with the blue extrusion case are also anodized and are isolated from the pcb as well.

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5 years 11 months ago #29529943 by TechSupport
Replied by TechSupport on topic Wiring and grounding
I must have missed the statement about the brushed motor.

The motor in itself just has to be connected via the m+ and M- channel. M1+ and M1-, M2+ and M2-.

The battery goes to ground and vmot.

You can choose to make the case or bottom plate a ground chassis(connect ground to plate/channis), but it shouldn't make any difference.

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5 years 11 months ago #29529944 by koffe
Replied by koffe on topic Wiring and grounding
This is the controller I have right now.
It is a brushed motor controller.

www.ebay.com/itm/251589475217


Thanks for your swift respons.

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5 years 11 months ago #29529945 by TechSupport
Replied by TechSupport on topic Wiring and grounding
I see it isn't one of our products, so you may need to speak with one of their support reps regarding the grounding. On our products, they are as I stated in the previous post.

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5 years 11 months ago #29529946 by koffe
Replied by koffe on topic Wiring and grounding
But I do not have any choice about the motor since the outerside of the motor is connected to the M-. And then the chassi is connected to the motor just because it is bolted to the chassi. And if I connect the chassi to the Ground/battery minus, then what will happen?
If I run the motor the reversed direction, the polarity will change in the output? And then the there will be a direct connection to ground. Am I thinking correctly?

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5 years 11 months ago #29529947 by TechSupport
Replied by TechSupport on topic Wiring and grounding
I couldn't tell you what would happen since it is not our product.

In regards to the motor itself, if you switch the polarity of the motor leads, it in a sense should cause the motor to spin in reverse.

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