Jennifer Rose Towing
Member
I have wanted to make a 2 speed selectable MX7000 bar for a while now. After a bit of testing, I got it done using a Pulse Width Modulator (PWM). The PWM controls the DC motor speed by sending pulses of power to the motor. This keeps up the voltage and torque as opposed to changing voltage to reduce speed. It uses a common power and controls on the ground side. I disconnected the motors ground and ran it to a relay. When the relay is not activated the motor is directly grounded and the rotator spins full speed. When activated, motor control is given to the PWM and its preset speed. Now a single rotator can have 2 different speeds with the flick of a switch. I set up the 2 inboard rotators on the bar in the attached video.
Here is a video link to it in operation
Although the PWM is designed for low voltage dc motors, I was not sure how it would work with a rotator. I tested it on a high speed rotator from a Vector before modifying the MX. I let that rotator run all day, likely longer then the combined runtime the MX will see in the next few years. No heat build up or funny smells during that test.
Here is a video link to it in operation
Although the PWM is designed for low voltage dc motors, I was not sure how it would work with a rotator. I tested it on a high speed rotator from a Vector before modifying the MX. I let that rotator run all day, likely longer then the combined runtime the MX will see in the next few years. No heat build up or funny smells during that test.
