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Forums13
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#11294 - 07/11/14 03:55 AM
Re: General Ac Drive Speed regulation question
[Re: Johnny]
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Joined: Aug 2011
Posts: 563
uppo72
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When you swapped the drive, did you also swap the resistors? When the load is negative, the load driving the machine, the braking resistors bleed off the excessive current and voltage. This slows the machine and controls the current.When the load is positive, the machine pulling the load, the braking resistors aren't being used. This keeps the DC buss at a constant voltage. Sounds like one of the braking resistors is open. Exactly. Also if you have swapped to drives it may be just be the drive that is faulty. I would however check all the setting with the other esc and make sure they are the same, and check the dynamic braking resistors are all ok. Your not even using the slow down part of the s curve which is where the braking resistors are really used, so that's where to chopping of the output occurs as Johnny has posted.
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#11319 - 07/12/14 02:02 AM
Re: General Ac Drive Speed regulation question
[Re: Vsec]
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uppo72
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The drive was swapped with the unit next to it but not the resistors. There are four resistors that total up to 27 Ohms, the resistors read the same as the other unit, I've checked all of the parameters and they seem to be okay. The escalator does not get a full load every day where I can check the amperage draw of the motors. I'm leaning towards the resistors not being able to bleed off the the excessive voltage and current. I will try to go there soon and check on a couple of more settings on the drive itself. I would like to replace the drive with a re-gen drive. If you have swapped the drive to the next esc and it faults the same it appears to me that you have transferred the fault next door. If the fault is exactly the same, then to me it cant be the resistors, motors(differing resistance) etc just the drive. So I would get the drive checked for that bleed off and try to get a new drive. You could swap the drive and leave them in place to see if the other drive effects the original esc for further proof if it doesn't fault out.
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#11339 - 07/14/14 01:50 PM
Re: General Ac Drive Speed regulation question
[Re: Vsec]
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uppo72
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The drive was swapped and the same escalator that runs in the down direction still faults out with a over speed fault telling me that it has something to do with the resistots, motors, etc. Ah well yes I agree with this. Check all the motor resistances, current readings with a tong tester in situ of you can, and rotate the fly wheel with it off to see if you have a bearing faulty.
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