01/08/2018 at 06:24 •
Steve scoped his washer and figured out the state of the TORQUE_PWM signal determines the rotation direction. I put together a quick Arduino test and verified this works for me. Thanks Steve!
I added an interrupt to the Arduino code but the MTR_CTRL_TACH signal is too noisy until 140-150 msec after I turn off the TORQUE_PWM. I was using the internal pullups on the input pin. I see real sharp 16khz noise spikes on the tach signal so I will have to figure out some filtering or how this noise gets on the line. I added a file with the scope shot of the noise. Yellow is TORQUE_PWM signal, Green is the MTR_CTRL_TACH signal.
12/23/2017 at 05:41 •
I have been unsuccessful at reversing the rotation of the motor. All we have to play with is the frequency and duty %. I was hoping a different frequency or duty > 50% would reverse the motor but no luck so far.
If anyone has a working washer I am interested in whether the tub ever reverses direction??? If yes, it would be great to see a scope on the TORQUE PWM signal in reverse. It would also be nice to verify the frequency during normal operation.
If the motor controller isn't designed to reverse, it would be easy to add a DPDT switch/relay/contactor to swap two of the winding wires between the controller and motor to change direction. (2Amp 250V AC)