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Thread: Problems connecting to viper 200 drive

  1. #21
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    Default Re: Problems connecting to viper 200 drive

    I presume are talking about having a servo on each end of the gantry ?

    Is that a rapid or slow move that it faults on at 20" ? Try a slow jog (30 -60 ipm) to see if it can move down the table without faulting. That will tell you if its a servo fighting each other problem as they move along.
    You may have to soften the tune if they are fighting.
    Are the 'a' (amps) parameters set the same for both drives ?

    Larry

    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com


  2. #22
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    Default Re: Problems connecting to viper 200 drive

    Larry-

    I installed the repaired drive today and it is working.

    I am still having issues that you might be able to help me with.


    The other x axis drive is still faulting. I am getting multiple LED error codes. It just depends how much I screw with it and the settings I use. The codes are 5,6,7 flashes.

    Here is what is happening--

    if I dis engage the bad servo from the rack and have it spinning freely, and only the one side driving the gantry, it moves up and down the table with ease. Gantry sways back and forth, but that is because it is being driven from only 1 side.


    At this time, I am watching the dis engaged pinion spin and it is very jumpy.

    The servo is connected to a duratrue gearhead, so I removed the servo from the gearhead.

    With the servo just spinning by itself, it is still jumpy. I put a mark on the case and aligned it with the keyway. This is at 11 o'clock when you look at it.

    when the servo turns counter clockwise it is very smooth and steady until it get to about 7 o'clock. Once it gets to 7'oclock it violently and rapidly spins to the start at 11 o'clock position.

    It then oscillates a few times, then continues to the 7 o'clock position where it continues again.

    with the power turned off the servo spins freely and evenly. With the power on, it locked in one position, but I can force it to move.


    any ideas?


    Steve



  3. #23
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    Default Re: Problems connecting to viper 200 drive

    When it holds, is it holding the same both cw and ccw ?
    It could be a problem with the encoder, make sure nothing is loose.

    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com


  4. #24
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    Default Re: Problems connecting to viper 200 drive

    No . It feels stronger in the ccw direction


    Sent from my iPhone using Tapatalk



  5. #25
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    Default Re: Problems connecting to viper 200 drive

    What is holding strength as a percentage on the weak direction 10%.. 50%, 80% compared to the good direction ?

    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com


  6. #26
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    Default Re: Problems connecting to viper 200 drive

    It might be 20 percent. I can turn CW no problem.


    Sent from my iPhone using Tapatalk



  7. #27
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    Default Re: Problems connecting to viper 200 drive

    I don't know if you got my PM i sent, but it sounds like a problem with the drive when it only holds one direction.
    Send it back and i will check it out.

    If its a plasma, then you may want to put some filters on the power wires to the motor. Maybe a ferrite core and RC snubber at the drive end.

    Larry

    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com


  8. #28
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    Default Re: Problems connecting to viper 200 drive

    Larry-

    It is a flame cutter, not a plasma. I am going to swap the two drives and see if the servo acts screwy, before I send it back. It might be a few days before I make it back to the shop.

    Steve


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  9. #29
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    Default Re: Problems connecting to viper 200 drive

    Larry-

    I was able to work on the drive for a few minutes today. I swapped the X and A axis. The servo motor was still acting the same.

    I swapped everything back, and then removed the cover to the US Digital E-5 encoder. The disk was covered in a whitish grey powder. I took the encoder apart, and wiped the disk with alcohol. It helped, but it is still skipping. I think I have a new encoder I am going to install sometime this weekend.

    I am going to look for a sealed encoder, do you have any recommendations on maker or model #


    thanks


    Steve



  10. #30
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    Default Re: Problems connecting to viper 200 drive

    Larry-

    I actually got about an hour in the shop today. I swapped the encoder. The motor now turns smoothly.

    I am now able to run the gantry up and down the table at 100 ipm.

    I am getting a 7 flash error on the drive every now and again. It is usually when the servo motor starts to spin.

    I am not sure if this is the drive you added the capacitor to or not. I will check later today.

    I am making progress though.


    Thanks


    Steve



  11. #31
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    Default Re: Problems connecting to viper 200 drive

    The drive that is faulting is the one that does not have the capacitor. Do I need to solder one on?

    Steve


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Problems connecting to viper 200 drive

Problems connecting to viper 200 drive