Recent content by nlaham

We had a service technician look at the pump today and I found out the motor indeed needs to be replaced. I haven't seen the motor, but I'm guessing it is burnt out. This would explain why it was getting the over current alarm, but my colleague still maintains it burnt out in less than a year...

Thanks you guys for the information. I have learned quite a few things through this. I'll let you know how it works out. Nick

I believe you are correct sir. The motor's max output I think is about 3HP (3450 rpms) and it is described as a three-phase six pole motor. It is also described in the manual as a Permanent Magnet Synchronous Motor (PMSM). Input is described as 230VAC (single phase), 50/60Hz, at 3200 Watts...

Thanks that makes a lot of sense. I believe what you are saying is probably what is happening. The transformers to go from two-line 208V to two-line 230V or 240V seem to be very expensive however. I will consult with the pump manufacturer and see. I will also see if I lower the VFD to a small...

I don't think I have Delta, because then if I measured pole to pole, I would get 240, but I only get 208. If I go pole to neutral I get 120

So the thrird leg would give me 3-phase service right? I am just using two legs of 3-phase wye power? I'll check for mechanical problems. Thanks for the tip. I'm hoping it's something like that since technically I am in the operating voltage range. Even though, they recommend closer to 230V...

I get very confused with AC electrical service, I'm a mechanical engineer so these things just confuse me. DC makes perfect sense to me. Anyway, I need to supply a single phase motor with 230V (the specs say 230V +/- 10%), so that would make my tolerance 207V to 253V. The motor is for a...

Welp this is where you lost me. Probably going to stop asking questions now lol. Thanks for all the info. Maybe I'll come back and read that after I get some more experience with power supplies.

I have been familiar with Ohm's law, just not too familiar with batteries and internal resistance. Well, I should say I was more familiar when I was in school, but forgot all of those things and needed a refresher, I'm only a Mechanical Engineer. I also have never really applied these principals...

That is a good idea, I didn't consider that. I might be able to arrange 2 smaller batteries easier that way too. Thanks for the tips.

Thanks guys. I think the iPhone requires at most 1 to 2 amps when it's being used heavily (high processing power). Are you saying that the the battery then will have that as its max as a lower limit? What is the upper limit then? I am hoping I can draw 3-4 amps off of it safely, but there is no...

Ok thanks for the support, I will see how it can be moved, who do I PM exactly, any moderator? Either way, I pretty much was able to accomplish what I set out. I was just hoping others could comment on the calculations, and not whether it makes sense to work them out in the first place or not.

So I wonder how it uses that feedback, I should probably go read about it rather than keep asking questions. Does it read the current, and knowing the internal resistance reference it can calculate the voltage drop, and thus lower it's impedance and bring the voltage back up. Anyway, I'm...

I am not using the wiring for transfer current to a load. I actually want to produce heating in the wire. I have heated these wires to over 2000 degrees F, I'm sure that wouldn't be code for any electrical application lol. The wire is live, but it is used for ohmic dissipation, not electrical...

:approve: