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Yamaha Generator problem
Murf, help me understand this. I was under the assumption that on a 220v motor, breaking either L1 or L2 is the start and stop? In other words 110v on a 220v motor will do nothing. The motor motor won't even try to run.
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Yamaha Generator problem
Murf, I'm not the type to disagree  but I'm gonna have to disagree with you on this one. I have somewhere around 50 220v motors on my farm and everyone is wired so when one hot wire (L1 or L2) is broken the motor shuts off. That's the only way it will work since you don't "have" to have a ground or neutral with 220v. I've fixed way too many electrical problems where the only thing wrong was a break in one of the hot wires.
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Yamaha Generator problem
Murf, What Joel pointed out is very true but each of my motors have their own breaker. I would never even think about working on one unless the breaker was off.
As far as the on/off switches go, I'll try to explain one type I use. Say a feed line. On the end of the feed line there's a control pan. In this control pan there's a paddle that operates a micro switch. When the feed gets low the paddle moves down straight and activates the micro switch. All the micro switch does is open or close L1 or L2 (according to which L you chose when wiring). The fans are a little harder to explain other than they all are wired into relays and the relays are controlled by a computer. Each fan has it's own relay. The relays break either L1 or L2 which shuts that fan off.
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Yamaha Generator problem
Murf, I guess one can't be too safe but it can get overly costly. The way I look at it is "if it ain't broke, don't fix it". By the way, the micro switches I use are rated at 10 Amps and 250 VAC.
Thanks for the discussion.
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Yamaha Generator problem
Good post Joel but when you say "Any switch installed in a 220vac circuit should always break both the L1 and L2 (both hot) lines.", what could happen if you don't?
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Yamaha Generator problem
Now we're getting somewhere!
1) Nothing will happen......until somebody attempts to work on the motor, with the belief that the power is off.
Regardless of any kind of switch/s or how sophisticated, one should always make sure the power is off. That would be the same as replacing something as simple as a light switch.
2) Voltage Feedback is another possibility, which, under certain circumstances, occurs when a motor fails.
Don't know where you're going with this? If the motor fails, it fails regardless of whether this switch is on or off. What if it failed when the switch was on? There should be a breaker in there somewhere.
3) This is more of a safety issue than anything else, but it's also possible that if both lines aren't switched, the owner of the device could be in violation of the law.
This I will have to research but I'm almost certain of the answer. There's literally millions of motors wired with a single L 220v switch. I'll have to get back with you on this one.
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Yamaha Generator problem
Joel, I'll agree with that. I'd even add that anyone that has a backup generator without a transfer switch should have a plan ahead of time and know what they'll be running. The bare necessities like a couple of lights, refrigerator, well pump and such. It doesn't take long for those watts to add up and bog the generator down. Of course it's dependent on the size of generator.
Thanks for the discussion
Billy
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