How to control an h-bridge on labview using pci-7340 and umi-7774

[mechanical Engineer]

I have a vehicle that i want to control its motion, using pci-7340 controller and a umi-7774, i have alraedy write the code on labview and i chech the program on a small dc-motor and it works, and also i control the motor using MAX., my hardware that i want to control it, are a dc-motor(24 v, 1/3 hp), which is responsible fordriving, and anither smaller dc-motor (18v,80W) for direction. I have already a PWM circuit for amplifieng the signal comes out from UMI-7774, and also to control the voltage value enters the motor, to control the speed of each of the motor, but now i need to control the direction so i will connect the o/p of the PWM to the H-bridge circuit input, and the H-bridge o/p to the dc-motor, so i need to know how to contro the h-bridge circuit using labview and MAX. if possible.

[Jasper S]

Hello,

If I understand correctly, you already have the motion control portion of your application completed, is that correct? 

How do you want to control the H-bridge, with a DAQ card, with the Motion Controller?  What kind of inputs does it have?

Regards,

Jasper S

[mechanical Engineer]

thanks for your reply, i have already make the code of a straight line move and the motor moves successfully, but know i want to put the H-bridge to be able to make a reverse direction for the motor, for your information i only use a PCI-7340 controller and a UMI-7774, where the controller connected to the UMI-7774, the UMI connected to a PWM circuit and the PWM connected to the DC-motor, so what do you think i can do?

[Jasper S]

Hello,

Assuming you just need to control a direction line on your H-bridge, you can use the auxillary digital lines on your PCI-7340.  I would suggest looking at the example, "Write 1 Point to Digital Line".  You should be able to add the functionality seen in this example to your existing code and programmatically set the direction on your H-bridge.

Regards,

Jasper S