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    Default Properly ground stepper motors ???

    Hello There

    I am trying to fine tune my machine and i think it might be picking up some noise from somwere
    how would one Properly ground stepper motors ???

    I have shielded cable at the motor end i put the shield to the chassis of the machine
    Is that right ??

    and what do i do with the shield at the controller end ??


    Thanks

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  2. #2
    Community Moderator Jim Dawson's Avatar
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    Default Re: Properly ground stepper motors ???

    I normally only ground the shield at the chassis end, and leave the motor end unconnected.

    Jim Dawson
    Sandy, Oregon, USA


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    Community Moderator Al_The_Man's Avatar
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    Default Re: Properly ground stepper motors ???

    How about your power supply?
    Al

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


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    Default Re: Properly ground stepper motors ???

    I have nothing to that other then the ground from the wall plug



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    Community Moderator Al_The_Man's Avatar
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    Default Re: Properly ground stepper motors ???

    What type of supply? SMPS ? Linear?
    Is the common grounded?
    What system? Mach?
    Al

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


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    Default Re: Properly ground stepper motors ???

    Hello.

    One thing that is normally overlooked is that some drives accept differential signals. The idea behind this technique is to cancel out any undesireable effect on one line with a similar effect on the other. To take better advantage of this technique twisted pair wiring is used.

    It is important to confirm that any given drive accepts the differential inputs as some are designed so that either one of their +/- terminals is permanently connected to its corresponding power supply terminal and then use the complementary drive terminal to signal the drive to move. That´s why the most common way to connect a drive is to wire the PULSE+ and DIRECTION+ terminals to +V (generally +5V) and the PULSE- and DIRECTION- terminals to open collector outputs.

    I have used this technique only under exceptional circumstances. The drives used were PARKER COMPUMOTOR and standard wiring showed to be very susceptible to interferences. Line filters were useless.

    Since the control system provided single outputs two SN75158´s were added. The interface card was later replaced with one using two DS9638´s. The pictures show both interfaces. The one using the DS9638´s is smaller due to the pin assignment of these chips that simplify PCB assembly and that the 8 bit DAC on the original interface was substituted by a wired 4 bit DAC.

    For single ended systems it may well be possible to use "noise reducing complementary wiring" by using both differential line drivers and receivers and twisted pair wiring.

    To implement that I would use DS9638´s on the control output side and DS9637´s on the receiving side next to the drives. It´s of course possible to use SN75158´s and SN75157´s or even a combination of both families.

    I hope this can help.

    Regards.

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    Default Re: Properly ground stepper motors ???

    Quote Originally Posted by Al_The_Man View Post
    What type of supply? SMPS ? Linear?
    Is the common grounded?
    What system? Mach?
    Al
    I have a 72V Unregulated Linear power supply
    I am not 100% sure what you mean by Is the common grounded ?
    I have my ground from the outlet going to the chassis of the power supply
    Yes I am using Mach 4



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    Community Moderator Al_The_Man's Avatar
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    Default Re: Properly ground stepper motors ???

    If the system allows it with no apparent reason why not, I always earth ground the common side of all DC supplies and take it to the star point ground, together with the service ground conductor.
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


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    Default Re: Properly ground stepper motors ???

    Quote Originally Posted by Al_The_Man View Post
    If the system allows it with no apparent reason why not, I always earth ground the common side of all DC supplies and take it to the star point ground, together with the service ground conductor.
    Al.
    I will have to get a electrician buddy of mine to look at that, i don't know enough about ac power

    I actually got some new DMM motors and drives so i think i may say F@#$ IT and install all the DMM stuff and problem solved hehe
    And i may get a HiCON Integra 7766 its a bit expensive compare to everyone else but probably well worth it but Still way way cheaper then siemens or allen bradley hehe

    Thanks



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