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Type: Posts; User: paul_arc

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  1. I have never tried one of these curved knives. If...

    I have never tried one of these curved knives. If I can't find a specialty one then I will give one of these a try. It just seems like another way to do it while still having to be extra careful not...
  2. This is how I have always done it, I always take...

    This is how I have always done it, I always take my time going slow and careful but to do about 15' of the super stiff cable really tires out my hands!
    If I can find a specialty tool to make my life...
  3. Knife for stripping larger multi-conductor cable?

    Yesterday as I was standing in the cold and wind stripping some 2/0 multi-conductor cable with a thick jacket (on the cable, not my self) while being very careful not to cut the insulation of one of...
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    I have the fluke 381. It looks pretty much the...

    I have the fluke 381. It looks pretty much the same except has the remote display. I don't have any complaints with it. I enjoy the remote display for putting the meter in MCC buckets and closing the...
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    Great! That is just the type of info I needed to...

    Great! That is just the type of info I needed to get started in this. I am handy with computers and good at electrical/ controls so I believe this should be my next step. My work will send me to any...
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    Great, thanks for that info. Then yeah I guess it...

    Great, thanks for that info. Then yeah I guess it sounds like I need to start getting into the programming side of things. Any idea what would be some good classes? I heard the AB classes are good...
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    Recommended PLC class

    I am looking for any recommendations for a good PLC class to take for beginners. Not so much for programming but more for how they operate and troubleshooting. I will want to get into programming...
  8. Thread: 3 phase motor

    by paul_arc
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    At the machine with the higher amperage readings...

    At the machine with the higher amperage readings with the motor disconnected, check your voltage on the feed wires phase to phase and phase to ground to see if you've lost a phase somewhere.
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    I have installed several TMCX connectors with...

    I have installed several TMCX connectors with TECK cable in hazardous locations. They work great but maybe overkill for your application. I have never used the VFD cable your talking about so you'll...
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    Perfect, thanks for the help. I can see why they...

    Perfect, thanks for the help. I can see why they are running the different voltages now.
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    Great, thanks a lot Larry! That answers a lot of...

    Great, thanks a lot Larry! That answers a lot of my questions I had on these. Thanks again!
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    Thanks Larry. Also, here are a couple more...

    Thanks Larry.

    Also, here are a couple more questions-

    If the motor was a wye motor and you don't wire the 3 HO terminals together like described, would it just send the voltage to the motor...
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    Question on particular transformer wiring

    I have two of the same transformers that are wired differently. Each of these transformers are used as a step up transformer and they serve only 1 motor each.
    Attached is a picture of the name plate...
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    I agree with the 125hp drive. Everything is sized...

    I agree with the 125hp drive. Everything is sized marginal and feel that for how this is set up that 125hp will be a good fit.
    It's always hard trying to size something that you know should be...
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    Yes, I could set the current limit so it doesn't...

    Yes, I could set the current limit so it doesn't exceed the transformer rating but a lot of times the operators like to get in there and pretend to be an electrician. Most of the time its just to...
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    The motor is 108hp. The drive failed from...

    The motor is 108hp.
    The drive failed from overheating, at least that's what the fault code said. Then it wouldn't run longer than 5 mins without over heating again. I cleaned it out and still...
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    That is a good idea about the thermal switch, but...

    That is a good idea about the thermal switch, but unfortunately they would rather the equipment burn up than causing a shutdown because of heat. There are however pressure switches installed to shut...
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    The only data I can find on this set up is that...

    The only data I can find on this set up is that its been going since 2012 trouble free and running at 51hz, 140A @ 480v. So not that much data but some at least.
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    The transformer is a K-rated transformer. The...

    The transformer is a K-rated transformer. The last running data before the drive went out was the motor running at 51hz, 140A. So the transformer and drive are both pretty much maxed out.
    It runs at...
  20. Are you sure of the area classification? The...

    Are you sure of the area classification? The speaker and enclosure in the picture are rated class 1 div 1. Either way, you need a bulkhead fitting through the wall. Myers makes one that's a hub type,...
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    52$$
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    Yep, the motor is under the ocean floor with a...

    Yep, the motor is under the ocean floor with a pump on it.

    Over size the transformer by 50% of the motor is standard? What about sizing the drive? Just keep it smaller than the transformer does...
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    It is a step up isolation transformer. The motor...

    It is a step up isolation transformer. The motor is 1775v, 3470 RPM.
    The vfd is only 480v, which powers the step up xfmr, which powers the motor.

    The transformer is only used to power just this 1...
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    The motor voltage is 1775v, but I don't know what...

    The motor voltage is 1775v, but I don't know what the actual voltage is by the time it reaches the motor since it isn't accessible.

    We plan to keep the existing 125kva xfmr, at least until it...
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    Standard VFD and transformer sizing practices?

    What I have here is one of our 100 hp VFD's went out. Currently it is powering a 108 hp motor. I would like to get a larger VFD for this configuration but it is on a 125kva transformer.

    My...
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