When calibrating an actuator with potentiometer feedback that is being controlled by an ACT-1, you will notice that the control gives you ADC readings. When the actuator is running the calibration you should see the ADC value increase as the actuator opens, and decrease as the actuator closes. Additionally, once the calibration is complete, the lowest number you should see is 25, and the highest 1,000. If you have an ADC reading below or above those values, your potentiometer, wiring, or limits switches may need to be adjusted. The ACT-1 needs to have at least 100 ADC between the low and high values for the calibration to be successful. If the low ADC value is higher than the high ADC value, then you need to swap the + and - wires in the ACT-1 feedback terminals. If the calibration fails because there is less than 100 ADC between the low and high check the following: Potentiometer wiring, if potentiometer is bad, if the actuator is limited to a partial throw by the high limit switch.
Potentiometer wiring: Troubleshoot as per the attached document.
Potentiometer is bad: Once potentiometer wiring is determined to be correct, troubleshoot by disconnecting the feedback wires from the ACT-1 and measuring the - and IN wires as the actuator is overridden open from a full close. You should see the resistance climb steadily and smoothly from ~0 ohms to ~10K ohms (assuming a 10K potentiometer). If the resistance reading jumps around, the potentiometer is bad.
Limit switch is limiting the actuator throw: If you are limiting the actuator throw significantly the actuator will not move far enough for there to be enough data points for it to calibrate. You will need to lengthen the throw of the actuator by adjusting the high limit switch. The actuator can then be limited in the settings/software side by never opening it to 100%.