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  • State Verified Answer
  • Date Ibrahim-yagoub@hotmail.com
    Ibrahim-yagoub@hotmail.com
  • Date 10 Dec 2020 6:00 PM
  • Replies 7 replies
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DC parker drive current decrease to zero A

Ibrahim-yagoub@hotmail.com
By  Ibrahim-yagoub@hotmail.com 1 month ago

Hello everyone,

We have Parker DC drive 590.Our motor running well without load but with load the current trend seems abnormal because it decrease until zero value then increase again.

How we can Interpret this phenomena?

In the current loop regulation: Is the current demand( IaDmd unfiltered) changes according to the load value or it is a constant value according to the speed setpoint.

Thanks in advance.

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  • Daniel Cliffe
    Daniel Cliffe, Employee 1 month ago +1 verified
    Good afternoon. For starters, is this a 590 or a 590+? Can you please provide your full catalog number? If your motor is not running well under load, here is a short check list: Has this motor or...
  • Daniel Cliffe
    +1 Daniel Cliffe, Employee 1 month ago

    Good afternoon.  For starters, is this a 590 or a 590+?  Can you please provide your full catalog number?

    If your motor is not running well under load, here is a short check list:

    • Has this motor or drive recently been installed?  If so, have you run an armature current loop autotune?
    • Has the motor recently been rewound?  If so, have you run an armature current loop autotune?
    • Are you getting any trips on the drive?
    • Do you have a line reactor (or isolation transformer) installed on the drive's mains input?
    • Have you meggered out the motor's armature to ground?

    When you say the current decreases to zero and then increases again, is this decrease/increase gradual or very abrupt?  Does it happen just once while running or constantly?

    if this is a new unit, it could just be a configuration issue or you might need an additional accessory (i.e. line reactor).  If the system is older, we might be looking at a component failure, possibly in the motor, the thyristors or the line reactor.

    IaDmd UNFILTERED can change rapidly based on the output of the Speed Loop block.  For instance, if you motor is not achieving its speed setpoint, armature demand current will rise to provided more torque.

    In short, there are a lot of things that can disturb the current output of the motor.  To find out which applies to your situation, focus on the questions provided above.  Feel free to attached your configuration file and I can review it.

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  • Ibrahim-yagoub@hotmail.com
    0 Ibrahim-yagoub@hotmail.com 1 month ago in reply to Daniel Cliffe

    The drive is 590+.

    The drive was already stopped about 8 months.

    Now starting the motor underload give us this periodic fluctuation. Our charge is a cylinder filled with material, the normal variation of current is in definite band. But the problem is the decrease till zero value. We suspect that the cylinder was mechanically deformed.

    We use another DC drive and we get the same phenomena and with no alarm.

    In our case we use bypass of speed loop, we don't use a speed feedback that's why I'm asking about the IaDmd unfiltered, it should be constant or variable?.

     

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  • Daniel Cliffe
    0 Daniel Cliffe, Employee 1 month ago in reply to Daniel Cliffe

    Ah, that makes more sense.  If you are bypassing the Speed Loop, that value should be constant.  Another thing you might check is your analog input.  I assume that is what is providing your current setpoint?  Maybe there is a damaged spot in your command wires that periodically cuts voltage to the setpoint input.

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  • Ibrahim-yagoub@hotmail.com
    0 Ibrahim-yagoub@hotmail.com 1 month ago in reply to Daniel Cliffe

    When we do a monitoring in diagnostic menu we find that the IaDmd unfiltered is inconstant and it decrease to minse values, is exactly when the current decrease.

    About the speed, we get the speed feedback from the drive and it didn't come to zero, it just fluctuates in the monument of zero Ampere.

    Now we need to get a technical interpretation to confirm that we have a mechanical obstacle. We are confused about this issue especially all we know that in mechanical load problem, the current increase not decrease.

    Another question, when the material inside the cylinder made the motor rotate by inertia, in this case we get like this phenomena?

    Thank you so much Mr Daniel

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  • Daniel Cliffe
    0 Daniel Cliffe, Employee 1 month ago in reply to Ibrahim-yagoub@hotmail.com

    Again, I think you might want to check on your setpoint.  Since your drive is not doing speed control, current demand should never suddenly drop to zero.  I suspect that your current setpoint, probably coming in on an analog input, may be dropping to zero.  There are still ways this could be a mechanical issue, but I think we should check the setpoint first.

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  • Ibrahim-yagoub@hotmail.com
    0 Ibrahim-yagoub@hotmail.com 1 month ago in reply to Daniel Cliffe

    OK Sir thank you so much. Now we are trying to change the loading material, the current doesn't drooping to zero. It seems OK. Maybe it was a mechanical issue. We will continue to check. Thanks a lot.

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  • Daniel Cliffe
    0 Daniel Cliffe, Employee 1 month ago in reply to Daniel Cliffe

    There may be more going on.  If you have an external control loop through a PLC, then this could still be some kind of mechanical issue.  You would want to track down the entire signal chain to understand where the problem is.

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