computer crashes for inductive load

[rk_t]

Hello,

I my application, I am trying to test a 12V DC motor through a labview program i created.

Connection diagram is as shown in the figure attached.

I am using NI USB 6002's analog output 0 to generate a 0-5v signal which is then given to a differential amplifier. This is a unity gain amplifier. The output of this amplifier is then connected to a SMPS based 0-30V power supply as 'remote voltage' input. This power supply in turn generates 0-30v out put in proporting to the 'remote voltage' applied.

When there is no load or resistive load connected, the system works fine.

But then I connect a DC motor, the computer system just crashes.

Can anyone help me with this.

Thanks!

[yytseng]

Do you have oscilloscope to probe the voltage waveform and current waveform on the motor?

Typically, may the EMF build an abnormal voltage to your PC. A diode may solve this issue.

[AnalogKid2DigitalMan]

Double post, main discussion is over here:

http://forums.ni.com/t5/LabVIEW/Computer-crashes-for-inductive-load/td-p/3555626

-AK2DM