One of our sister sites has the same equip. we do but are having electrical issues. and they aren't running properly. I'm wondering if this might be the problem. They are 230v single phase printers (we are using 208). If they ran 240v (2-120v phases) as opposed to 2-240v phases would they even work? The FLA for 230v is 7 amps. Line to neutral is still 120v and line to line 240v. The phases would be 180 degrees apart instead of 120. We are actually at 203v and barley pulling over 1 amp when running. Since the machine says 230 single phase I'm just wondering if they ran 2-120v phases. I am getting the info second hand and am at home just pondering. I will speak with them next week but it's bugging me. I don't know why they would have single phase 240 in the building but I'm just curious.
240v single phase
- Thread starter Magnum44
- Start date
- Status
208 (or 240) single phase requires you to connect to two opposite phases whether you are connecting to a single phase or 3 phase system. On a 3 phase system it makes no difference (ignoring a 120vrequirement ans presence of a high leg) if you are measuring 203 volts you either have a 208 system or bigger problems.
The overwhelming thought I have when reading your post is "call for assistance".
The overwhelming thought I have when reading your post is "call for assistance".
I understand that. We have 120/208 and 277/480. I guess I wasn't very clear with my question. I'm just wondering if these pieces of equipment (230v) would even function on a single phase 240 (2@120) instead of the single phase 240 (2@240) which is why they might be having issues. This is a sister site on the other side of the country. Unfortunately I can't be there so I'm just guessing as to why they are having problems. I will know more next week. I have seen this before where someone tried to run other equipment this way and it wouldn't run at all. This seems to be functioning but not very well. I know that these are 230v single phase from a 3 phase system but they may not know that. Anyway, just thought I'd ask. Some of you may have seen this before.
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
And just to be clear, there is no such thing as "2-120V phases". Single phase in the US is always 120/240V; it is 240V from line to line, and 120V from line to neutral. It is possible to accidentally connect 2 wires that each read 120V and have something rated for 240V not work, but that is because someone used two lines off of the SAME SIDE of the breaker panel bus bar, so there is no difference between them. If that were the case however, they would NOT be reading 240V between the wires, they would be reading zero volts.
Again, they need to hire a professional who can see the entire situation in person.
Again, they need to hire a professional who can see the entire situation in person.
big john
Senior Member
- Location
- Portland, ME
Almost sounds like we're talking about the difference between split-phase 120/240V and two phases of a straight 240V Δ.
If you're sure the equipment doesn't care about the phase-to-ground voltage, then here is no difference between the two, regardless of phase-angle.
If you're sure the equipment doesn't care about the phase-to-ground voltage, then here is no difference between the two, regardless of phase-angle.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
What kind of problems are they having? "they aren't running properly" is not specific enough to know if it is a supply voltage problem.
Is the equipment rated or both 208 and 240 volts supply?
If it is rated for both voltages, does one need to change jumpers, settings, etc. to use on one or the other voltage?
Thanks for your replies. I will find out more next week. There are so much Electronics involved I'm not sure what the real issue is. I've been out for a few years (6) with 4 back surgeries from blown discs after falling off of a ladder. I am finally working again (1 month now) and I'm the only sparky that I know of in all of our facilities so I have been extremely busy and a little overwhelmed at times. Amazing how much I have forgotten in that time. I did my apprenticeship through the IBEW and was an Electrical contractor for some years. The back injury really wiped me out and I thought I was retired for good. Thankfully I have finally recovered enough to go back to work for a great company but like I said I get a little overwhelmed at times. So forgive me if I ask a stupid question but It was on my mind last night and I was kind of shooting from the hip. There have been some scary stuff done by prior maintenance personnel at our location and at some of the others so who knows what's been done. Anyway, I will get more info and get it resolved. Again, I appreciate your replies.
They are 230v. Ours are operating on 208v. That is a good possibility about the settings though. I had to change some of our equip. from 208 to 480. Everything was rated for either except one soft start contactor in 2 machines (go figure). We've had some identical equip. show up set for different voltages so that may be an issue for them too. I agree though, I didn't give enough info so I will get more next week.
- Occupation
- Licensed Electrician
Electronics can be tricky. Most of the problems with them can be traced back to bad wiring practices.
That's tough. Glad you are back on your feet.
What was your local? Were you a contractor out west or somewhere east of the Rockies?
Some good arch supports will help you get through the day. I use a custom made set from my chiropractor. Cost north of two bills but they work great.
I do that late at night too.
Maintenance guys... ughh. That is all you need to say about that. Is it the same guys at each facility? Probably a different crew at each one. That's even worse.
That's tough. Glad you are back on your feet.
What was your local? Were you a contractor out west or somewhere east of the Rockies?
Local 340 Sacramento, Ca. Then I became a non union contractor in California before we relocated to Northern Nevada.
Maintenance guys... ughh. That is all you need to say about that. Is it the same guys at each facility? Probably a different crew at each one. That's even worse.[/QUOTE]
All different. And the plumbing...
hmy:
What was your local? Were you a contractor out west or somewhere east of the Rockies?
Local 340 Sacramento, Ca. Then I became a non union contractor in California before we relocated to Northern Nevada.
Maintenance guys... ughh. That is all you need to say about that. Is it the same guys at each facility? Probably a different crew at each one. That's even worse.[/QUOTE]
All different. And the plumbing...
hmy:- Status