Hi all, I have just received this motor controller which is supposed to allow you, by connecting switches, to reverse a motor direction.
According to instructions you connect pin k1 to earth for forward and k2 for backward. I measure 5v on both k pins so here you would have a short circuit. Can anybody explain this?
The instructions with this unit are very hard to understand. Has anyone seen a better guide to using this unit?

 

Post a link to the motor controller.

 

Of course there would be +5 volts on both logic inputs, because they are internally pulled up, SEPARATELY. That is a very standard practice, that is a good design. With the controller disconnected from power, use your ohm meter to check the resistance between the two pins.What point were you using for the volt-meter reference??
If you can post a copy of the instructions that would be useful.

 

https://www.shanglinmotor.com/products/motor-control-unit/motor-control-unit-wjzh-m01/
Appears to be one of the typical Chinese remote activated units, the ones I have picked up just energize a simple relay for each direction.
Unfortunately most Chinese products come with no instruction details whatsoever.

 

Of course there would be +5 volts on both logic inputs, because they are internally pulled up, SEPARATELY. That is a very standard practice, that is a good design. With the controller disconnected from power, use your ohm meter to check the resistance between the two pins.What point were you using for the volt-meter reference??
If you can post a copy of the instructions that would be useful.

Here is a copy of the instructions. ohm meter shows open circuit between k1 and k2 pins and ground. I measured 5v with meter from these 2 pins to ground on power. This is now how I think it works. You connect the motor to pins m1 and m2, then connecting k1 to ground operates the motor in 1 direction and k2 to ground in the opposite direction.
I am using 12v at the power input and a 12v motor. If I get 12v at the motor output great. If its only 5v then I will need a relay. I bought this unit hoping not to have to use a relay but this will not be possible if I get 5v from the motor output. You can get a reversing voltage from a DPDT relay with the appropriate connections. You wouldn't need this unit at all.
I guess now the only thing to do is check if I am going to get 12v out from the motor connection. Do you think I will?

 

Hi all, I have just received this motor controller which is supposed to allow you, by connecting switches, to reverse a motor direction.
According to instructions you connect pin k1 to earth for forward and k2 for backward. I measure 5v on both k pins so here you would have a short circuit. Can anybody explain this?
The instructions with this unit are very hard to understand. Has anyone seen a better guide to using this unit?

Just read the 'Interlock Mode' section. It tells you what you need to do.

 

The setup is a bit complex, BUT the voltage part is simple: you connect the voltage supply for the voltage you choose to the power terminals and that is what the motor gets. So 12 volts at the power terminals and the motor get 12 volts. If there is an end-of-travel barrier in your installation then you will need to install and wire limit switches to cause the motor to stop.

And a caution: The direction selection connections for K1 and K2 are to the SYSTEM common NEGATIVE, Not to "Earth". Big difference, really.