NI-9263 Analog Output to WEGCFW700

[ramm29]

We are using an NI-9263 and a Labview program to control a waterpump rig. The analog output to the inverter is scaled at 0-10v 0-4600rpm.

I have monitored the output from the NI-9263:

Requested        Recorded speed         Recorded Voltage

1000                 913                              2.17

1500                 1368                            3.25

2000                 1825                            4.33

2500                 2280                            5.40

3000                 2736                            6.48

I am not sure why the voltage out will not exceed ~6.48v, even though it is still within the scaling and the predifiend range of +-4.6k input.

If I input a value of 3300 or greater the the value on the Labview screen will update but the voltage output does not get sent.

Any advice for why this might be the case would be greatly appreciated, I am muddling my way through the software. 

Regards

Tom

[santo_13]

It would help to see the VIs that you used to control the 9263. BTW, how did you record these voltages? 

To rule out the ability of 9263 to generate the required voltage, disconnect your WEGCFW700 from 9263, run your application, and measure the voltage generated by 9263 using a multimeter. If this method works as expected (i.e., generated the correct voltage), then the issue would be that your external equipment is loading the signal generated by 9263.

[ramm29]

Hi Santhosh,

Thank you very much for the response.

Yes these values were measured using a multimeter with the WEGCFW700 detached. 

I have attached the VI folder for reference, the program we are running is - 00_MAIN_VI_TWO_MOTORS 70degC_02112022. It is the motor 2 side that we are struggling to get up to speed.

Tom

[santo_13]

Another experiment I would perform is to use the DAQmx test panels to generate signals and measure using DMM, this way you eliminate your custom application and simplify the automation to the bare minimum. If in this experiment, you still observe that the value you set in the software and the value you measure at the terminal using a good accuracy DMM, it is possible that your 9263 may require calibration or repair.