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That would have been Ma Bell. Most people today would not know that reference.

That may have been the case waross. It's like it took out some coils, and some contacts. There really doesn't seem to be any consistancy to what it took out. Also, another question, on some of the newer machines they have power surge protectors installed. Is there a way to tell if they need to...

We have a redundant system for our Computer Room in the other building. I suppose you are right that I should do that with this building. Thanks.

Had a lightning strike our pole supplying our manufacturing facility. It took out alot of contactors, or so it would seem. It took out 2 fuses and a resistor, or arrestor, on the pole. So there was still some power coming in. If we would have shut off the main breakers for the facility...

On another note. The conductors for all the drives and motors are fed from one Buss plug, 480v. They go to a distribution block. When the one motor fried it took out the 70 amp fuse supplying this setup. The other motors were still working, by what I assume, from the VFDs generating the third...

Or so it would seem that everything is grounded. As I was rereading my reply I should really double check everything.

Thanks. Everything is grounded. So the only way to get rid of the voltage, when working on changing out a motor, is either shut down the other motors or rerun the line in seperate emt.

Good idea. Thanks. It's kind of wierd how I have both ends of the wires disconnected and it still has voltage. We did find out that if we shut down the other drives and motors that the voltage goes down. Half, or four, of the motors are are run in the same 1 inch emt.

So we have 8 exhaust fans in our heat treat area. They all are on their own drive systems. One of the motors fried. We turned off the drive setup and were going to unhook everything but noticed 60-103 volts from any of the lines to ground. So I started to check things out a little closer to see...

Thanks for the input. Yeah I'm just trying to figure out, if and how, to get the supply from the building to a lower level to pass inspection. One thought was to maybe move this transformer to the supply side, before the machine disconnect. Or just get another one for that. It's hard to get any...

This is just a generic schematic that I just modified to show what this machine that came in has. My question is; what would the SCCR be now with that transfomer in the power circuit? Or would it still be based on the lowest down stream component? I would think it would change. Hopefully you...

I opened up a 45kva dry transformer that was not in use for a few months to put it back in use. It's hanging from the ceiling of our facility. on each mount where the coils are, and the rubber pads are, there is a white crystalline foamy looking substance that pretty much disintegrates when you...

We have an Amada Saw that has an error code of E-210. It is not listed in the manual, online, and even the person at Amada didn't know and was going to look into it, but now will not return a call or e-mail. I saw on Prctical Machinist site that someone brought up that issue also, and of course...

Yeah, good point. I was thinking that same thought about a seperate rpm readout. I will wait and see if there are any difficulties in the thread rolling process. I figure it won't really show up until we run the larger diameter bolts. I did write down the other readouts, like the torque and amps...

See if there are any old guys out there that are familiar with these. We have a few Roll threaders that have Allen Bradley 1336 Impact drives on them. We initially set them up with the motor rpms from the motor nameplate. We now would like to have it reflect the rpm of the spindle so the...

Thanks for the replies. I haven't really gotten back to it because they ahve been using it pretty steady. It's running fine as long as they shut the different functions switches off before pushing the master stop/e-stop.

Nothing has changed, again, to my knowledge. Hard to troubleshoot something that is in use alot. When I am able I'll start to disconnect stuff, then step by step reconnect them and try it until I get it to trip. I'm kind of leaning towards a solenoid valve. Just a premonition.

We have a 3 phase 480v washer with heaters, a conveyor and exhaust and such. For some reason it blows the secondary fuse of the control transformer when the master stop is pushed.. It has run for years and has never done this, to my knowledge anyway. I've checked all heaters, pumps and motors...

So what's the compliant sizing of a 3 phase industrial rooftop heat/cool unit disconnect. The label gives us a 53 amp MCA (minimum circuit amps) and 70 MOP (maximum overcurrent protection). Can I use a 60A fusible disconnect? My understanding is the MCA is already calculated out with 125% above...

Thanks FacEngrPE, I'll just copy that and get it printed on some label material and stick it on there. Just kidding. Yeah we actually have a company now in town that does UL listing. They have done a couple of smaller machines for us already. It's good with the Inspector too.