How to control Linear velocity and position of Servo value using the same PXI 7344 controller?

[Project Support]

Sir,

My application is to study the performance of the Brakes that were used in Automobiles (Picture attached). I am conducting about 25 kinds of tests.
I am reading the Voltage from Linear POT that corresponds to the Cylinder speed and using one Analog output channel to write the voltage value (corresponding to the speed).

The sequence of the test is
1. Apply a Forward voltage (+ve) to the Servo valve which controls the speed of the Moving cylinder. This moves the cylinder forward at a set speed to a distance until it faces a preset load (done by the operator).
2. Once it faces the preset load, I am locking the distance it moved and we are controlling the posit
ion for a preset time using a PID loop.
3. After that, I am applying a Reverse voltage (-ve) to the servo valve which moves the cylinder in the backward direction until it reaches the home Position. So we are not using any limit switches here.

When the cylinder moves in Forward direction, its velocity will not remain constant(as set by the operator) because it starts facing load in the beginning itself (before its final load is reached).

Now I want to control the Velocity of the Cylinder at a constant value. So I decided to go for a Motion controller card (PXI 7344). I haven't worked on the card before.

Can you give me guidance how to implement both Velocity and position control using PXI 7344 card? What are the things I need to get?

Thanks in Advance.

[mhaag]

Thank you for contacting National Instruments. If you are just getting starting with the 7344, then I would recommend first taking a look at the user manual for the 7344 and the NI Motion User manual:

7344/7334 Hardware User Manual
http://digital.ni.com/manuals.nsf/websearch/6808C4832C396D7286256A9A0064E73F?OpenDocument&node=132100_US

NI-Motion User Manual
http://digital.ni.com/manuals.nsf/websearch/EB609F9BA065EA7A86256D350060C9A0?OpenDocument&node=132100_US

The NI-Motion User Manual will discuss what operations and functions can be performed on the 7344 and give some examples of both LabVIEW and C/C++ examples.

As far as what you will need, once you have the motion controller and have installed the NI-Motion driver, then you will need to decide what
application, such as LabVIEW, Visual Studio, etc..., you will use to program the board. With the Motion driver, National Instruments includes a number of shipping examples to help you get started. Along with this, there are a number of other documents and examples on ni.com/support.

Along with the software needed to control the hardware, then obviously you will also need to be sure to have the correct hardware. This includes the drive (amplifier), motor, and any stages that may be required. Refer to our motion homepage for more information on selecting a motor and getting started:

http://www.ni.com/support/motnsupp.htm

Regards,
Michael
Applications Engineer
National Instruments