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frequency problem with analog signals

Hello everyone

 

I'm having a little problem generating my signals from Labview to USB3101FS. I would like to create a 3 phase net (3x400V) 50Hz with a amplifier. Now, I'm sending a signal (7,67Vpeak-to-peak) to the USB3101FS and that signal is amplified by a PAS. When I want to use this created net to turn my motor, I get a rpm of 3240. This means I've created a 54Hz-net, but I want to have a 50Hz-net. 
In the attached program can the parameter to control the frequency (it's now set to 150) seen on the left top corner. 
If I set this parameter to 139 (which associates with 50Hz), than I come a really exotic frequency spectrum and the motor is not running like it should.

Can someone please help me with this?

 

Dear regards

Thybris

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Dear TBLUgent, 

Unfortunately i don't have the ULx lib installed.  
Anyhow, are you sure you get the right phase shift with the 139-parameter? Also how is this associated to the 50 Hz?
For me, without looking to deep into the code, this numbers are a little bit interesting?

Best regards

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