Mid-7602 suitable stepper motor

Hi all,
I wish to control two stepper motors using a MID-7602 motion controller.
The two motors are the same spec being 5V with 1A.
My question is, Is it safe to connect these directly to the MID-7602 motion controller or do I need some kind of circuit to make it compatible.
Thanks

As long as it is a 2 phase motor, it should be a direct connection. Here are links to a related query and the MID-76XX Manual:
http://digital.ni.com/public.nsf/allkb/421DCBF37C8334288625708C0073086B
http://www.ni.com/pdf/manuals/372454g.pdf
-AK2DM
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
~~~~~~~~~~~~~~~~~~~~~~~~~~

Similar Messages

To drive Unipolar Stepper Motors using MID drive

Hello friends I have purchased a RS components MID drive and I want to control a unipolar stepper motor using the same. The stepper motor is having 6 wires. I have used the same drive to run a bipolar stepper motor but I need to know as to how I can wire a unipolar motor to the same.I would like to know the connections and the disadvantages if any in driving a unipolar stepper motor using the MID drive.

You can drive unipolar motors with the 7602/7604, but you wire them as if they were bi-polar. The user manual (which can be downloaded from the NI web site for free) shows the way to wire the 4-phase motor as a two phase motor on page 26. The basic idea is that you either ignore the center tap - wire Phase A to Phase A, and Phase A' to Phase A', or ignore one of the phases by attaching Phase A to Phase A, and Phase A' to the center tap.
Hope this helps-

Suitable card for three stepper motors

Hello everyone,
I want to ask which DAQ card would be suitable for controlling three (X,Y,Z stage) stepper motors using continuous and/or finite pulse generation. X and Y stages have to be independent on each other (i.e. diagonal movement), Z one does not but it would be nice. Solution may include buying two cards to ensure the independency of counters.
I have heard that for finite pulse generation two counters are used for one axis (stage). Does it mean I need a card with six counters? Or two cards with four and two counters? In that case, our lab is equipped with the old 6035E card providing two counters (unfortunately not independent in finite pulse generation mode probably due to the statement above), which could handle one of the axes.
I dont want to use DIO for pulse generation because there is no possibility to control the frequency of pulses. Frequency for the stepper motor varies from 1000 to 2000 Hz.

Hi Diego,
There is a way to only use one counter to output a finite digital pulse train.
Normally when performing a finite counter output operation, two counters are required. One counter is used to actually output the pulses and another is used to gate the first counter and therefore output a finite number of pulses.
The way to accomplish this same behavior with a single counter is by setting up a continuous pulse output task with a start trigger and a pause trigger. The pause trigger takes the place of the second counter normally used as the gate signal, freeing this counter to be used for other operations.
Finally, an external source must be used to create a pulse of a desired width in order to achieve a finite pulse train that used a single counter on the PCI-6602. In the case below the external signal is passed to Dev3/PFI0, which has been configured to be the pause trigger source terminal.
Pause triggers are only valid for continuous sampling mode with implicit timing. You can find the properties for the proerpty node in the following locations:
Properties » More » Pause » Trigger Type
Properties » More » Pause » Digital Level » Source
Properties » More » Pause » Digital Level » Pause When
For each property, right-click the terminal and select Create » Control or Create » Constant from the shortcut menu.
Keep in mind also that there are stepper motor controllers available from NI like 7332. For more information check the link above:
http://sine.ni.com/np/app/main/p/sn/n21:6/ap/global
May you have further questions dont hesitate to ask!
Best regards,
David Varga
Applications Engeneer
NIH

Can I Connect a 6-wire Unipolar Stepper Motor to the MID-7654/7652?

I am trying to connect a 6-wire unipolar stepper motor to the MID-7654/7652 motor driver and was wondering how the wiring would work on that?

The connector is simply a pass-through for the signals generated by the motion controller card for hooking up to a separate driver compatible with stepper motors. It would be used if you had a combination of servo and stepper motors in your system used in conjunction with separate servo and stepper drives.
-AK2DM
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
~~~~~~~~~~~~~~~~~~~~~~~~~~

Difference between open loop and closed loop mode when finding the index on a stepper motor axis.

I have a test system which uses a PXI-7352 motion controller with a MID-7602 stepper motor drive to position a 200 step/revolution stepper motor with an attached 1000 line encoder. The MID-7602 is configured for 64 microsteps per step, giving 12,800 microsteps and 4000 encoder counts per revolution. The system is controlled using LabView 7.1 and NI-Motion 6.13. To home the motor, I've defined a sequence in MAX which first finds the reverse limit switch and then moves forward to the encoder index pulse.
When finding its reference in open loop mode, the system its reference at the same microstep each time. When findings its reference in closed loop mode, the system finds its reference somewhere within about a 20 microstep wide range.
I hope somebody out there with more experience with this controller can describe the difference between finding the encoder index in open loop mode and finding the encoder index in closed loop mode.
Thanks,
Mark Moss

Hello Mark,
I suspect that the behavior you are experiencing has today
with the resolution difference between your encoder and your
microstepping. Let me illustrate with an
example:
Example Setup
Stepper
Motor
NI
Motion Controller
10
steps per encoder pulse (Every 10 steps the controller gets an encoder
pulse, therefore positions 0-9 all appear to be 0 to the controller)
The
system has a maximum of 3 pull in moves set
Open Loop Scenario
The
system is commanded to go to position 9.
The
controller sends out 9 pulses.
The
motor moves to position 9.
Closed Loop Scenario
The
system is commanded to go to position 9.
The
controller sends out 9 pulses.
The
motor moves to position 9.
The
controller checks its position and sees that it is still at position 0
because it has not received an encoder pulse.
Because
the controller thinks it is still at position 0, it sends another 9 pulses
as its first pull in move.
The
motor moves to position 18.
The
controller checks its position and sees that it is at position 10 because
it has only received one encoder pulse.
Because
the controller thinks it is still at position 10, it sends1 reverse pulse
as its second pull in move.
The
motor moves to position 17.
The
controller checks its position and sees that it is at position 10 because
it has only received one encoder pulse.
Because
the controller thinks it is still at position 10, it sends and additional
single reverse pulse as its third pull in move.
The
motor moves to its final position of 16.
I believe something similar is happening with your
application as it looks for the index pulse.
Because the controller does not compensate for what it perceives as
position error in open loop mode, the motor always goes to the same commanded
position. In closed loop mode, the motor
is bouncing around inside the single index encoder pulse trying to find a
certain position.
There are several recommendations I can make towards
correcting this behavior. These
recommendations are in order of effectiveness:
Setup
your system so that there are more encoder counts per revolution than
steps per revolution.
Turn
off pull-in moves by setting them to 0 in MAX.
Use an
open loop configuration.
Play
around with the pull in window in MAX.
Regards,
Luke H

What third party drive do I use to connect my umi-7764 to a phytron stepper motor (zss66)

I would like to connect my phytron stepper motor (zss66) to my UMI-7764, do I need a third party drive ?
And if i need one, which one ?
Thank !
Seb (I am french so if you want to aswer french, let's go )

Sebastien,
l'UMI 7764 n'est qu'un bloc de connexion. En aucun cas celui ci ne délivre de puissance. Donc il vous faudra nécessaire un bloc puissance entre l'UMI et votre moteur. L'UMI 7764 ne délivre aucune puissance.
(N'oubbliez pas d'aimenter l'UMI avec une alimentation 5V externe. Ce 5V est à connecter sur le connecteur situé au debut du boitier).
National Instruments fourni des drives (MID 76XX)dont les specs sont limités en courant. (Elles sont affiché dans le lien ci dessous). Dans le cas de l'utilisation d'un drive NI, il n'est plus nécessaire d'utiliser l'UMI 7764.
Le choix de votre drive se fera en fonction du nombre de phase de votre stepper, et de son courant nominal.
Voici un lien sur lequel vous trouverez une liste de drive pour stepper. (Voir
le bas de la page web)
http://www.ni.com/devzone/advisors/motion/driveadvisor.htm
Je ne connais pas les spec de votre stepper, mais si vous désirez l'utiliser avec un UMI 7764, le plus simple serait de contacter la fbricant de ce moteur, et d'obtenir une liste de drive que celui conseille.
Raphael TILLET
Ingénieur Application
NI FRANCE
Cordialement,
Raphael T

I want to run a stepper motor using FPGA card 7851r with 9474 driver C rio 9151 is it possible or can i do in LABVIEW CVI

Hello i want to run Stepper with 7851 R FPGA card with 9474 driver of crio chasis but i am not able to understand how to proceed .Or can opt this option by using lab view CVI
Solved!
Go to Solution.

Hi SHV,
actually I don't know in which context you want to use your existing hardware for your stepper motor.
1. The hardware, which you describe, is/was used for which application? ( data acquisition, controlling a system, etc)?
2. Did you buy the hardware especially for the motor application?
3. You don't know how which signals are required for your stepper motor.
Here are some basics from NI about motor control
Fundamentals of Motion Control
http://www.ni.com/white-paper/3367/en
NI Motion Control Technical Library
http://www.ni.com/white-paper/3054/en
4. Why do you get the idea the digital output module 9474 is suitable for the stepper motor?
I would recommend to talk directly to the customer support, so we can figure out in detail your aims about
the application. Contact your local NI office or request
a service request on following website:
Service Request Manager
https://sine.ni.com/srm/app/login/p/tab/getassistance
Kind regards,
RupiDo

Stepper motor vi

Hi,
I am relatively new to the labview codes for stepper motor control.
Let me start by writing what I am trying to achieve. I am trying to control a valve with a stepper motor. I have a bipolar stepper motor from Oriental motor co. mounted on the valve. I dont have the driver/ controller for the motor. I am thinking of buying a third party low cost controller that will drive the motor and use the labview to talk to the controller.
I am using labview 6.0 and I guess but I am not sure if one can write a simple stepper vi. that will allow one to get around. I already have 6024E data aquisition card running on the computer.
Can anyone suggest how should I go with in achieving this?
Thanks
SAL

Hi Sal -
Most motion applications involve a controller, a drive, and a
motor. The controller runs a deterministic feedback-control loop
and sends updated commands to the drive. A separate drive unit is
necessary because the PCI/PXI bus is incapable of sourcing the current
required by the motor. The drive also takes commands from the
controller to handle error situations and shut down the motor
appropriately.
NI offers a line of motion controllers (PCI/PXI-733x, 734x. 7350) and
motor drives (MID-760x, 765x) that fit most stepper and servo
systems. The controllers have a driver call NI-Motion and an
associated API. This API lets you program your controller in
LabVIEW, LabWindows/CVI, MSVB, etc. If you choose to use a
third-party controller, it will have its own API (VIs and function
calls) provided by the vendor.
If you would like to program your own control loop to handle custom
inputs and algorithms, you can use the NI SoftMotion module. This
module allows you to create a custom controller from your LabVIEW
Real-Time system.
NI motion controllers and drives can be found here: NI Motion Hardware
The SoftMotion module is described here: NI SoftMotion Development Module
David Staab, CLA
Staff Systems Engineer
National Instruments

Which stepper motor is required to connect with labview

title:fault detection in pen. i am doing a project in image processing using labview .i want to interface stepper motor with labview using daq how can i interface and which type of stepper motor is suitable for rolling metal sheet in which the pen is placed at the top

I would start with the motor and work down, Labview will woek with any.
1. Figure out how much motor you need: torque, speed, resolution, size (nema 23, 34 .....)
2. Select a drive for your motor: many diferent drivers to control a particular motor, How much current is required, motor voltage, inductance
3. Determine the interface to the controller: step and direction, cw/ccw, serial. (I like step and direction)
4. Determine support options for the motor, encoders, limit switches ...
5. Now you can select your ni card to match the interface, (NI Motion- good for copmlex interfaces and multimotor synchronization, Digital/ counter timers simple but limited conmplexity, less expensive but more software needs to be written)
This all depends on budget and requirements.
Paul Falkenstein
Coleman Technologies Inc.
CLA, CPI, AIA-Vision
Labview 4.0- 2013, RT, Vision, FPGA

Controling four bipolar stepper motors using one DAQ

hi all
l've just started using labview an i am looking to contorl Four bipolar motor for a spine robot though four stepper motor driver using a NI USB-6211 DAQ each motor will be independent so i am wondering can this this be done with one Daq since there is only two counter outputs on the digtal and the same on the analog.the speed of the motor does not matter as they will be push and pull.

Hi polarmess,
Welcome to the NI Discussion Forums and LabVIEW. The USB-6211 has (among other functions) 4 digital outputs and 2 counters. If the digital outputs are not sufficient for your application (e.g. not quick enough) and you also want to control each of the 4 motors individually, then then USB-6211 would not be suitable for this application.
The NI sales team are always available to provide advise on hardware for specific applications, and I encourage you to call in to your local NI branch to discuss what the most appropriate hardware would be to control your robot. Our contact details are available via the contact link on ni.com.
Regards,
Imtiaz Chowdhury
Head of Digital Technologies
Brand786

Wiring mid-7602 with laser shutter switch

how I could wire mid-7602 motor dirve to control the laser shutter switch?

The 7342 motion controller has a 2nd 68pin connector that has 32 general purpose digital I/O's on it, TTL compatible, up to 24mA sink/source.
You would probably need the 68 pin mating cable for it and some type of 68 terminal breakout card with terminal blocks to connect your wiring to for your external devices.
There are more details in the manual here:
http://www.ni.com/pdf/manuals/373454a.pdf
I never have used an NI motoin controller, not sure how the hardware/software is set up to access and control or read the digital I/O pins.
Now that we know what controller card you have, maybe someone from NI can suggest the specific cable and breakout card part numbers and how to access the I/O.
What software and version numbers do you have (programming envirnmont, motion control software, DAQ and MAX)?
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
~~~~~~~~~~~~~~~~~~~~~~~~~~

Trouble positioning a stepper motor accurately (to one step)

I'm using a PCI-7344 with an MD7506 motor driver from RS. I'm testing angle sensors whose voltage output is proportional to (you've guessed it...) angle.
I'm stepping the motor round by one step, checking that it's got there by reading the encoder, measuring the sensor voltage and repeating.
My problem is that the motor sometimes 'hunts' around the target position. In closed loop (with an encoder associated with a motor) this results in sometimes not being able to reach the target exactly with the pull-in moves.
Using open-loop and reading the encoder directly I get better results because I can loop more times, but the motor will still 'hunt' around a target point, changing direction a few times as it over
shoots by a step.
As there are a million MAX settings for this I won't list them all here, but I'm checking for a move complete when the InPos flag is set and I have a deadband of 0 steps too. I'm only rotating at 120 step/sec with a 10ms pause between steps.
Do I have to accept that stepper motors are only accurate to +/- 1 step or am I doing something wrong?
Thanks,
Mike
Mike Evans
TRW Conekt
N.I. Alliance Member, UK
http://www.Conekt.net

Mike,
Maybe other people will have better suggestions, but in my case I can advise to either:
1. increase the number of pull-in moves,
2. increase the microstepping of your drive,
2a... together with a higher precision encoder...
Other than that, the accuracy is advertised to +/- 1 step, so maybe you would like to consider a stepper with more steps/rev.
Good luck!, I hope other people will give other suggestions.
Nestor.
Nestor
National Instruments

Stepper motor and loacell PID control - waveform motion.

Hi,
Hardware : cRio9073, C series module 9403 for stepper motor control and 9215 for load cell data acquisition.
I am trying to control a stepper motor in a closed feedback loop system with a load cell. The user would have to input two things : the maximum load applied and the frequency of the motion. At the moment I have it working in open loop controlling how many steps forwards or backwards it does and at what rate, with a display showing the load being applied.
I am now looking to include the "PID.vi" built into labview into my existing code. I am using the load cell output as the 'process variable' and the 'output' of the PID will control the wait time between an ON and OFF signal to the motor (since I have to do the PWM in software as the 9403 module doesn't do it in hardware. Is this the right way to do it? )
I wish to make the motor do a sinewave motion, thus the 'setpoint' of the PID would be dynamic. I have therefore linked the "Sinewave form.vi" (also built into labview) to the setpoint and the frequency of the "Sinewave form.vi" will be the user input for the frequency of the motor. However my problem lies with the 'Sampling info' of the "Sinewave form.vi" : Previously that is what controlled my number of steps, defining the maximum displacement of the motor. Now I need the peak of the generated sinewave to coincide with the maximum load applied defined by the user. How can I make it do that?
I have attached my existing code with how I have attached the PID.vi at the moment.
Many thanks for your help
Lawrence
Attachments:
PIDControl.vi ‏23 KB
BIOGROWTH.lvproj ‏46 KB

Hi Lawrence,
Here is an example PID VI.
Regards
Rico P
Attachments:
General PID Simulator.vi ‏22 KB

Stepper motor closed loop control using 7344

I have some question about the closed loop control of stepper motor using 7344. From the NI website I got that closed loop steppers work differently from closed loop servos. Instead of adjusting the output on each PID iteration like a servo system, closed loop steppers will do a pull-in move at the end of a move to adjust for any difference between the target position and the encoder feedback. By default, it will attempt the pull-in move three times.
Now for example I got five points: (0,0) (10,20) (30 40) ( 31 60) (50 65). The request time interval I set as 10ms. This mean that in the first 10ms, the machine should move from (0 0) to (10 20). But for some reasons the machine can not move to (10, 20), it moves to (8,16) and the first 10ms passed. In the second 10ms, how it move? Move from (8 16) to (30 40), If like this, the following error will accumulated. In practise, it is not accumulated. Is there anyone can explain something about the closed loop control of stepp motor? Thanks a lot!

Requested Interval is additional data for the Position buffer type. The Position buffer type requires a Requested Interval parameter, and indicates the time between contouring data points in milliseconds. For all other buffer types, the Requested Interval parameter is ignored.
The controller will use the closest value it can that is greater than or equal to the interval value you requested. Your time interval must be an even multiple of the PID rate.
For example, given a PID rate of 250 ms, a time interval of 11.2 ms between points is physically impossible, so a call to configure buffer with an interval of 11.2 causes the buffer to actually be configured for 11.25 ms, since 11.25 is the nearest possible interval greater than 11.2. The following table shows valid intervals for each PID rate.
My question is like this. For example I got five points: (0,0) (10,20) (30 40) ( 31 60) (50 65). The request time interval I set as 10ms. This mean that in the first 10ms, the machine should move from (0 0) to (10 20). If it is impossible for the machine to move from (0 0) to (10 20), there are two ways to solve this problem. First is the time interval is 10ms and assume it move to (8 16) within 10ms and take (8 16) as the start point and (30 40) as the end point of the second move. Second is extend the time interval, assume it takes 14ms to move from (0 0) to (10 20). After 14ms, the (10 20) is the new start point for the second move. I think it works as the second ways.If not, the following error will accumulated. Is there anyone can explain something about the closed loop control of stepp motor in detail? Thanks a lot!

Stepper Motor with Linear Stage (Position Control and Data Acquisition)

Hey All,
So.. I've attached a stepper motor to a linear stage and so far it's working pretty well. Using a stepper motor driver from Pololu, I've simplified the control of the motor by just using output pulses from the counter output of a PXI-6143. I've tested the motor using the Pulse Train examples in LabVIEW and all is working well.
My goal now is to allow the user to collect data from a pressure sensor, attached to the linear stage, every X number of steps. From what I can tell so far, and please correct me if I'm wrong, the motor step movement is synchronised with the pulse train input. That is to say, if I give the motor a 200 step pulse train, the pulse train ouput is completed at the exact time the motor has moved 200 steps. From this, I've created a VI that moves the motor X steps, aquires the data point, and then repeats this process for the required amount of data points. The problem with this is that the motor movement is not continuous; it stops for a split second to take the data point.
How can I have labview ouput a pulse train of say 1000 steps and record a data point every 50 steps?
Two ideas that came to mind were:
1. Use the counter input port on the card to count the pulses being sent to the motor.
2. Use an encoder connected to the motor shaft.
I wanted to stay away from theses ideas though since they require resources from the DAQ card.
Thanks,
Ryan

Hi Ryan,
Just to cover all the bases, what version of LabVIEW are you using and can you attach your VI? Initially your ideas sound like they should work, do you expect to be nearly maxing out the DAQ?
Thank you,
Deborah Y.
LabVIEW Real-Time Product Marketing Manager
Certified LabVIEW Architect
National Instruments

Mid-7602 suitable stepper motor

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