I make repairs to machine controllers.
To make things simple to explain we will say for now that these machines use a 3 phase motor that has to run in both directions. There are limit switches to tell the controller when it has reached the end of its travel, then the controller switches 2 of the phases around to make the motor run in reverse.
I would like be able to test these controllers from a single phase supply. I have built many similar testers for single phase controllers as it is easy to use the output voltage to drive a motor/cam cluster (didn't need motor reversing on those ones), but, I cannot think of a way of getting a motor to run in both directions on mains AC.
Any ideas ?
To make things simple to explain we will say for now that these machines use a 3 phase motor that has to run in both directions. There are limit switches to tell the controller when it has reached the end of its travel, then the controller switches 2 of the phases around to make the motor run in reverse.
I would like be able to test these controllers from a single phase supply. I have built many similar testers for single phase controllers as it is easy to use the output voltage to drive a motor/cam cluster (didn't need motor reversing on those ones), but, I cannot think of a way of getting a motor to run in both directions on mains AC.
Any ideas ?