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Author Topic: Strange current draw readings  (Read 3494 times)

DavidTurner

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Re: Strange current draw readings
« Reply #10 on: August 01, 2016, 01:59:00 pm »

A new transformer/meter/disconnect or just a new 3 phase disconnect?

We traced the install all the way to the pole. It all seemed to be brand new conduit. There had only been single phase service at this club before. That would seem to indicate a new transformer as well.

Quote

A bad/missing neutral connection can cause the same symptoms.  The real danger being that they can cause an overvoltage on a piece of gear and ultimately damage something.

I watched the production company connect his tails. He gave each a good tug to make sure they were secure. We went back to each cam lok junction and made sure that each was securely tightened. I also kept an eye on the volt meters. They hovered between 115 and 121.

I moved the monitor rig to another circuit on a different leg leaving only the bass player's wireless, the tracks rack and the drum thumper on leg three thinking that we could continue the show without any of those things. After moving the monitor supply, the surge would alternate between the legs...
« Last Edit: August 01, 2016, 03:08:45 pm by Mike Sokol »
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Ike Zimbel

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Re: Strange current draw readings
« Reply #11 on: August 01, 2016, 04:06:14 pm »


We traced the install all the way to the pole. It all seemed to be brand new conduit. There had only been single phase service at this club before. That would seem to indicate a new transformer as well.

I watched the production company connect his tails. He gave each a good tug to make sure they were secure. We went back to each cam lok junction and made sure that each was securely tightened. I also kept an eye on the volt meters. They hovered between 115 and 121.

I moved the monitor rig to another circuit on a different leg leaving only the bass player's wireless, the tracks rack and the drum thumper on leg three thinking that we could continue the show without any of those things. After moving the monitor supply, the surge would alternate between the legs...
That should rule out a problem with your connections, but I have seen issues with compression fittings between the transformer and the mast either go bad, or not be made properly in the first place. Likewise, any connection inside the panel upstream of where the tails tie in could be loose. I think that if any piece of your gear was causing 24 amp voltage swings, it would have blown up already. I would guess that it might be difficult to isolate all the equipment used on this gig and power it up the same way at another location (like the production company's shop), but that would be one thing to try. Failing that, I would recommend that the installation be inspected thoroughly, from the pole to the stage.
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DavidTurner

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Re: Strange current draw readings
« Reply #12 on: August 01, 2016, 05:17:39 pm »

Thank you all for your replys. It is unlikely that we will play this club again this year. We are at a different venue 800 miles away tomorrow. I will, at least, keep a watchful eye on mu gear to see if the issue repeats.
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DavidTurner

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Re: Strange current draw readings
« Reply #13 on: September 15, 2016, 06:56:43 pm »

Update: Since starting this thread we have played a variety of venues - clubs, fairs, festivals, theaters - the issue has never recurred. I suppose we can rule out any of my gear
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Re: Strange current draw readings
« Reply #13 on: September 15, 2016, 06:56:43 pm »


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