What is /INHIN1 terminal in the UMI-7764? It's not in the 7344 HW user manual.

What is the purpose of the /INHIN1 terminal and how does it relate to the Inhibit Output signal?

The basic purpose of the inhibit circuitry is to shut down the drive and inform other components in the system if a fault is detected. The UMI-7764 has circuitry onboard that will OR together four different sources of inhibits; the per axis controller inhibits, the per axis external inhibits (INHINx), the external inhibit all (INHALL), and the host bus interlock. You can use the INHINx lines to shut down an individual axis or the INHALL line to shut down all axes. These are typically wired to the "fault" output of the drive(s) you are using. When the UMI detects an inhibit from any of the four sources, then it will generate an inhibit signal on the INHOUTx lines. The INHOUTx lines are generally connected to the "enable" inputs on the drive(s). The polarity o
f the INHINx and INHOUTx lines is configurable using the switches on the UMI.
Do not simply tie any of these signals high or low with a jumper. Failure to properly connect the inhibit/enable signals can cause (and has caused) expensive damage to your motion system.
Cheers,
Brent R.
Applications Engineer
National Instruments

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Is possible to give a 5V input to the umi 7764 connector blick for the limit switch inputs

I am using a umi7764 connector block for my 7344 controller. My motion control hardware provides me a 5V output in case the limit switches are enabled. But the umi 7764 connector block connections for the limit swithces are in such a way that it doesnt get any input, instead it has to be directly connected to the limit switches.Is there any way to come around this problem so that the limit switch inputs read the 5v given out by my motion control appplcation

If your drive has individual outputs for the forward, reverse, and home switches, then you could connect these to the their respective terminals on the UMI. You will need to either disable limit functionality on one component (controller or drive) or make sure the limit behavior for the devices does not conflict with each other. It probably is best if the controller handles the limits, but this will depend on your application.
If the drive only has one output to indicate that one of the switches has been activated, then you have fewer options. In this case, you should probably just use the limit protection on the drive and poll that single output with another input on the UMI.
Regards,
Brent R.
Applications Engineer
National Instruments

How do I power the UMI-7764?

The power supply says 5V, but what should the current rating of the power supply be? I just want to confirm that it is 0.2A as in the user guide, but it says " + user-defined encoder and limit power ". I do not know what that means---but we are in fact using an encoder and stepper motor, so it seems relevant. Thanks for letting me know.
Sincerely,
Christian

Christian,
0.2 A is the maximum power consumption of the active devices on the UMI-7764. If you connect devices like an encoder to the UMI, you typically power them via the +5V outputs of the UMI-7764. These outputs are feed-through terminals that are directly connected to the +5V input of the UMI, so you will have to add the power consumption of any device that draws current from these outputs.
E. g. if your connect three encoders with 100 mA power consumption each, you will have to use a power supply that is rated for at least 500 mA.
Best regards,
Jochen Klier
National Instruments Germany

How to connect the UMI-7764 to a geared motor

Please, I have simply to connect a geared motor to the UMI-7764 thru an L293D driver.
Please, could you tell me which outputs of the UMI-7764 do I have to connect to the driver ?
Thank you.

You'll need to refer to the documentation for the L293D driver to determine which lines it need attached. For servo motors you typically atach the Analog Out line as well as the Encoder feed back lines from the UMI. For steppers, you need to at least wire the step and direction lines to your drive. I recommend taking a look at the 7764 user manual as well for help with wiring.

Using a CW230 Bi-polar driver with the UMI-7764 and 7330 PCI. But clock level is loaded below 2v and motor will not run?

I have my stepper driver connected to the +step and aogrnd terminals on the UMI-7764. With the driver connected to these terminals the output across the two is 2vp. When I disconnect the driver, the level returns to a 5vp signal. My drivers inputs are optically isolated so I suspect the impedance my be higher than TTL can drive. Is there any way to manually set the output parameters of the 7330 Motion controller?
Thx...Vic

Hi Vic,
Take a look at this KnowledgeBase: How Do I get the 73xx Controller and UMI-7764 to Drive a Third Party Stepper Motor?
I think it may have the solution to your problem. Also, here is another KnowledgeBase that is relavent:
Why Do I have to Supply Power to my UMI-7764?
I don't believe there is a way to manually set the output parameters of the 7330, but I don't think this is the source of the problem. If the KnowledgeBase articles are not the solution, post back and we'll keep troubleshooting!
Kristen H.

UMI 7764 second axis not working

I have a strange problem with my NI motion control setup and I wondered if anyone could help me.
I have the following setup:
PCI-7330 connected to a UMI-7764
Connected to the UMI-7764 I have two P70530 stepper drives, themselves connected to two Nema-23 stepper motors with shaft encoders wired back to the UMI-7764. All following the manual.
The 'Inhibit Input' switch is set to active high and the 'Inhibit output' switch is set to active low.
Both P70530 drives initialise (solid green LED). The stepper drive and motor connected via the 'Axis 1' terminals of the UMI-7764 works fine. The second one, connected via the 'Axis 2' terminals does not. When I attempt to start a motion via MAX, the motor audibly "clicks" once and then disengages. The drive then has a flashing green LED.
The motor will remain disengaged until I attempt a motion in the opposite direction, at which point the same "click" is heard and the motor is now engaged. No motion other than the vibration caused by the motor engaging/disengaging occurs.
Both drives and encoders are wired identically into the UMI. I have switched the cables with the drive that works, as well as the drives themselves and even the motors. The result is always the same; the drive/motor wired to 'Axis 1' works fine and 'Axis 2' "clicks" but doesn't move.
I'd appreciate any advice or suggestions anyone can provide, please.

A bit more information in case anyone can help me:
Repeating the attempted motions in MAX for each axis I probed the poles of the UMI connected to the stepper drive. The results are below.
The Inhibit Input of Axis 2 seems to be always at 5V.
The 'Inhibit Input' switch on the UMI is set to active high and the 'Inhibit output' switch is set to active low. I would have expected, therefore, that reversing these switches would make Axis 1 stop working and Axis 2 start working. However, when I did this Axis 1 stopped working but Axis 2 continued the same behaviour (i.e. any attempted motion causes the motor to "click" and then disengage).
I also attempted to reverse the Inhibit Input action via MAX, but the option is greyed out.
Is there any reason why Axis 2 would be forced into having Inhibit Input at 5V? And, more to the point, is there a setting to stop it happening, or is this a hardware failure?

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What is /INHIN1 terminal in the UMI-7764? It's not in the 7344 HW user manual.

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