Re : Lambda power supply+labview+current control

[arihant]

Hi there,

I want to control the output current from TDK lambda power supply based on input from a pressure sensor. Based on available drivers from Lambda site, I was only able to output certain current and voltage value. But don't know how to control it depending on other input like pressure reading.

Is there any way to do this in labview?

Thanks in advance.

Arihant.

[Rodéric]

If you get the pressure within LabVIEW you can implement any algorithm to control the TDK Lambda power supply (wich work nicelly with LabVIEW btw)

[Freelance_LV]

Hi

How are you getting the pressue value? Do you read the pressure from NI modules or from third party hardware?

either ways, you can use the respective NI drivers or third party drivers compatible with LabVIEW, to read the pressure data and send a current value to Lambda drivers accordingly.

Show us how you are reading the pressure data and we can help you with your requirement.

[arihant]

I have taken the pressure reading from Pfeiffer vacuum gauge controller using serial interface. Labview drivers for the same were provided by the manufacturers. I can display the vacuum value as well as current and voltage readings from power supply.

The vi and library files are attached.(The program may have issue of parallelism but its not affecting execution.)

[Freelance_LV]

Hi

I use LV 2010 and could not open your VI. Please post the VI in LV2010.

So, when you have the pressure value read from the serial input, you can use the comparison pallete functions to check and control the current value.

Also, what is the behavior that you see with this VI? is the current no setting correctly? is it delayed?

[arihant]

Hi freelance

I am attaching the program in 2010 version. Hope you can execute it.

[moderator1983]

Unfortunately I don't have drivers for either of 'Pfeiffer vacuum gauge controller' and 'TDK lambda power supply'...!!

But went through your code, and it looks like you're reading from both the instruments... but you should be reading only from 'Pfeiffer vacuum gauge controller' and should be writing (current or voltage or both values) to 'TDK lambda power supply'...!!

Now before you write the new (current or voltage or both) value(s)... you can place a simple algorithm that will calculate new value (based on reading from 'Pfeiffer vacuum gauge controller')....!!