I have been hit by the dreaded title bug again, can some mod give change the title please to "How does this circuit actually work" tHANKS FOR YOUR HELP
I have been recently working on a machine for wrapping bales for a local farmer. There is a small leadscrew type ram driven by an an adapted wiper motor for feeding plastic film.
The system is basically a straight forward servo system with feedback to a controller with two switching relays on the output, driving the motor. It is standard H bridge configuration.
However instead of the output relays directly supplying the motor the following circuit is placed between the controller output and the motor, with no separate power supply, power is derived directly from the controller H Bridge.
There is no actual problem with it and it seems to work fine but what does it actually do and how does it work?
I think it is either some sort of resettable overload trip or else designed to give a very fast turn off to fine tune the motor position but I really am not sure. Has anyone ever seen anything like it before? attached is the original drawing and I have labelled the components
I have been recently working on a machine for wrapping bales for a local farmer. There is a small leadscrew type ram driven by an an adapted wiper motor for feeding plastic film.
The system is basically a straight forward servo system with feedback to a controller with two switching relays on the output, driving the motor. It is standard H bridge configuration.
However instead of the output relays directly supplying the motor the following circuit is placed between the controller output and the motor, with no separate power supply, power is derived directly from the controller H Bridge.
There is no actual problem with it and it seems to work fine but what does it actually do and how does it work?
I think it is either some sort of resettable overload trip or else designed to give a very fast turn off to fine tune the motor position but I really am not sure. Has anyone ever seen anything like it before? attached is the original drawing and I have labelled the components
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