Week 14: Design of Ramp Up/Down Voltage and Troubleshooting

 

These are the problems we encounter when we program the slew rate for power supply :

1. All the 3 phase voltages are unable to respond at the same time.
2. Users have to press the "UPDATE" button 3 times to increase/decrease all the 3 phase voltages.
3. A specific amount of delay time must be introduced so that the slew rate work perfectly.
4. It will increase/decrease the voltage phase by phase which is undesirable
5. The built file cannot be executed on the other computer

 All these problems are caused by the driver we downloaded from the 3rd party website, which is the California Instrument, Ametek Programmable Power website as LabView doesn't develop this driver. It's tough for us to troubleshoot the problem as the test bench is always in used, hence it is time consuming for us to solve the problem. However we are closed to solving the problems above.

 

Our task this week is to configure the power supply so that it will increase the voltage slowly to 235V with a slew rate of 20V/s. We have faced a lot of problems with this features.

At first, we program it in such a way that  it enables the output first before load in the voltage value. However this cause the output ramp up phase by phase which is undesirable.

The main culprit of the fault is time. The value must be loaded into the VI before enabling the output so that all the 3 phase voltages can ramp up together. However, this leads to another problem which is all the 3 phase voltages ramp down phase by phase with a great amount of delay in between it.

We are still troubleshooting the problem and try to solve it by next week.