What are the pin connections from 7764 to stepper motor drive

[enigmata]

what are the pin connections from UMI 7764 to stepper motor drive? I use PCI 7340 controller. Third party driver  is not branded, but assembled.  It has 3 inputs, one for (A,A/) one for (b,b/) one for enable, apart from ground pin.

[Jochen]

(A,A/) and (B,B/) don't sound like inputs but these terms are typically used for motor connections. ENABLE matches with INHOUTx on the UMI.
Typically stepper drives require two digital input signals. The majority of the drives require step (STEP) and direction (DIR) signals, in some rare cases they need Clock Wise (CW) and Counter Clock Wise (CCW) signals. The UMI provides both types of signals via the same pins. You can select STEP/DIR mode or (CW/CCW) mode in the configuration settings of your 7340 in MAX.

I'm sorry, that I can't give you better advice, but you really will have to find better information/documentation for your drive.

Kind regards,

Jochen Klier
National Instruments

[enigmata]

My motor drive has 5 input pins in total, a RESET pin, a GND pin, 3 ports to carry the DATA signals: two of these ports are each connected to 2 transistors,through a series of Inverters the output of which is given to the stepper motor. The remaining 1 port has a single transistor in parallel with a IN4007diode. Does any of this help u recognize where i need to connect my STEP and DIR ports?

[enigmata]

the A,A' and B B' which i had mentioned refer to the 4 coils in the stepper motor...

[Jochen]

That was my suspicion. So the question is, where are the command inputs (e. g. step and direction) to connect the drive to the UMI?

Jochen

[Jochen]

Sorry, I have just read your second post. I'll have a look at your first post.

[Jochen]

Ok, I have had a look at your description of the input circuitry, but to be honest, this doesn't help me to clarify the signal connections. If you don't have any documentation, you could try to identify the correct inputs by connecting them to a signal source (+5V) via some mechanical pushbuttons or switches. Maybe you can make the motor move by manually pressing the buttons. If this works, you should find out, which input is responsible for the direction and which one is responsible for the steps.

If this works, you should also measure the current the inputs sink and check if this in the range of the specs of the 7340.

Jochen

[enigmata]

The diagram on the back of the motor goes as above,

The foll dgm is somewhat similar to the circuitry of my stepper motor drive ckt, where the a1,a2,b1b2 are for the a,a' and b,b';
apart from thuis, the drive has another input which is connected to a transistor in parallel with the diode, through 2 inverters/diodes 7406 and then to a 12 v supply. Now can this help u recognize it? The problem is i am not sure if this ckt will take instructions in step/dir form.

[enigmata]

[Nate.H]

Dear enigmata,

Here is a link to the UMI Manual that describes the signal connections:
http://www.ni.com/pdf/manuals/321941b.pdf

What you really need is the documentation for the input of the "translator" mentioned on the left side of the last diagram you posted. It is still not possible to tell which of you drive inputs correspond to step and direction (or CW, CCW) because in the circuit that you posted, these signals have already been converted by other circuitry in the drive to the A, A/, B, B/ output signals for the stepper motor.

I agree with Jochen: Without the documentation you will need to test it out as he described in his last post.

Best Regards,

Nate Holmes
National Instruments