PICAXE circuit board Help

[B9e0n]



Hi, could someone help me just outline how this circuit works, its used to move an electronic actuator into different positions, just need to know how the actual circuit operates, thanks

 

[kak111]

Tell us more about this actuator.

Looks like there can be two independend movements
and maybe two position coders ?????

 

[B9e0n]

basically: The test rig has an electrically driven actuator capable of moving 0.15m. The actuator can be driven up or down. Attached to the actuator is a platform on which weights can be added. The Actuator is also connected to a feedback potentiometer and an indicator arrow. The task is to move the actuator up and down between pre- set positions indicated by the indicator arrow and as detailed below. The task will be repeated a second time with weight added to the platform. The task will be repeated a third time, but this time whilst the task is taking place faults will occur on the rig. The microcontroller must detect these faults and take appropriate action.

At the moment i just need to know how the circuit does this