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 > Your search for posts made by 'Wayne Dohnal' found 214 matches.

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  Subject Author Date Posted Forum
RE: Strange radio interference situation

Someone still listens to AM radio?I judge what I listen to by the content of its programming, not the wavelength of its signal.
Wayne Dohnal 12/06/14 07:08pm Tech Issues
RE: Running Two 20A loads from a single breaker

MOST RV'ers have NO clue. I am on the Sales/Service side of the RV. You have no idea how many times customers come in with complaints about overloading their 30 amp RV. Get the 50 amp service and then just use a 50 to 30 adapter with a 30 amp extension cord. It is BETTER to have MORE power to utilize than to NOT have that extra power and then grumble about it. DougI understand what you're saying and reluctantly accept it. I can't understand how RV'ers don't get it. It's not any more complicated than water tanks hold so many gallons, gas tank holds so much and you can go so many miles, etc. As I type this, it hits me that the examples I'm using all have gauges (sorry as they are for the water tanks). Maybe if the RVs came with a few electrical meters people would "get it" instead of being in the dark.
Wayne Dohnal 12/05/14 11:46am Tech Issues
RE: protection for car

Waste of time and money towed 40,000 miles in the past 5 years no problems with the Honda or the newer JeepWhy assume others will have the same result as you? On our first trip with the short overhang motorhome and a low to the ground car, there were hundreds of paint dings in the car's lower fascia. Protect-a-tow has mostly solved the problem except for occasional "leakers" at the edges.
Wayne Dohnal 12/03/14 09:49pm Dinghy Towing
RE: Running Two 20A loads from a single breaker

In todays market with the multitude of 120 appliances, RVer's should NEVER buy a 30 amp RV, they should insist on the 50 amp RV. Just opinion here. I get along just fine with 30 amps and would rather not wrestle with the heavier shore cord. I've got a 50 amp cord for backup generator power in the house, and it's a beast compared to the 30 amp cord.
Wayne Dohnal 12/03/14 03:22pm Tech Issues
RE: Running Two 20A loads from a single breaker

My motorhome came from the factory with this device (but made by Intellitec) wired to the microwave and water heater. It's fairly common in 30 amp rigs.
Wayne Dohnal 12/03/14 10:13am Tech Issues
RE: PI power mgnt system w/Honda generator.

Many eu2000i users have bonded the output to the generator's ground. Here's one of several threads discussing it. Picture of one way to do it on page2. http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/27867996
Wayne Dohnal 11/29/14 11:49pm Tech Issues
RE: Generator fried microwave after gen shut down several times

Download a service manual here. It has a page for code 12 troubleshooting. http://www.cumminsonan.com/www/pdf/manuals/981-0530C.pdf
Wayne Dohnal 11/24/14 04:34pm Tech Issues
RE: Generator fried microwave after gen shut down several times

Just an educated guess. The microwave is an "unfriendly" load for the generator, with its current draw not directly following the voltage waveform. The circuit breaker reacts to time-averaged current, while there might in reality be very short current spikes many times the breaker value that don't result in a trip. There could be a weak link anywhere in the generator circuitry that can't handle the short current spikes, followed by a protection mechanism detecting it and shutting the generator down. Could also be a problem with the voltage regulator being confused by the unfriendly load, too. Not knowing the Onan internals in any detail, I'd have to say the problem could be with almost anything in the generator part. My first shot in the dark would be to make sure all the electrical connections are tight, clean all of the connectors, and reseat plug-in circuit boards if there are any.
Wayne Dohnal 11/24/14 03:04pm Tech Issues
RE: Generators, do you get what you pay for?

You didn't say what the load for the test was. If was a resistive load like a portable heater, try it with a more unfriendly load like an air conditioner or power converter with a somewhat heavy load. If the waveform still looks good with those loads you have found yourself an above average conventional generator. For comparison, here's a picture of an Onan Microquiet running a fully loaded PD9160A converter (voltage trace on top, current on bottom): http://i852.photobucket.com/albums/ab86/tigerwillow1/Onan_PD_fullLoad.jpg
Wayne Dohnal 11/24/14 10:37am Tech Issues
RE: Generator Question

Good chance it's a gummed-up carburetor. In that situation they usually just run rough with the choke off, but I could envision it dying completely with a severe gumming-up. Sometimes running a while with Seafoam in the gas will clear it up, other times the carb has to be taken apart and cleaned. See the first sticky thread in Tech Issues for more info.
Wayne Dohnal 11/24/14 12:00am Tech Issues
RE: Where did you get your Electrical knowledge?

I want to second Salvo's comment about the microcomputers. If you don't have the resources to do custom chip and/or circuit board design, this is where the action is. I have a good RV example. I wanted to add a trans temp gauge, which has little or no availability for the Sprinter chassis. The trans has an internal temp sensor with a voltage output proportional to the temperature. The sensor voltage can be converted to a voltage for direct voltmeter temperature readout with a linear equation, a perfect job for a simple analog computer op amp circuit. I tried and failed to get it to work reliably. I think it had to do with needing highly stable resistors, the physical layout, and good shielding. Embarrassed (still) I went to plan B, an ATmega development board for $20 plus a programmer device for $35. Added a precision voltage source for the on-chip A-D converter (a magic chip), an rs232 level converter (for the display, another magic chip), and a bit of software. Works like a champ with none of the analog circuit idiosyncrasies to fight with. Adding a couple of push buttons for mode and brightness control didn't require ripping it up and starting over. For many things, this is the only way to go these days.
Wayne Dohnal 11/22/14 02:29pm Tech Issues
RE: Chasing electrical gremlins - GFCI outlet puzzle

I'll jump on the bandwagon of saying there's more to this than meets the eye. The way the GFCI outlets are mass produced as identical devices, I think the odds of one being able to reverse the hot and ground are astronomical. Coupled with the previous observation that the ground goes 'to', rather than 'through' the outlet, the odds are astronomical-squared. The outlet tester gives a possible interpretation of the pattern of lights, not a definitive answer. With 2 lights lit in the 'hot-ground reversed' pattern, it's indicating voltage between ground-neutral and ground-hot. Another cause of this indication would be 'neutral connected to hot', which I believe would be consistent with your measurements and observations. While I still find it unlikely that the outlet would do this, the odds are IMO somewhat less than astronomical. There are probably other causes of the outlet tester's indication, too.
Wayne Dohnal 11/22/14 12:01pm Tech Issues
RE: Where did you get your Electrical knowledge?

Ham radio, ~50 Heathkits, minicomputer research assistant in college, EE degree, 40+ years work in electronics, destroyed 10% of broken things attempting to fix them, destroyed 20% of working things trying to modify or enhance them. The lessons learned from the sparks and smoke are the ones best remembered. Things are different for a younger person now. Devices are so miniaturized that they're close to impossible to work on. You can't look at something to get an idea of how it works. No more looking at a radio or tv and discovering things like the rf section, if section, deflection yoke, high voltage supply, etc. It's all in magic chips now. For the most part, you're a chip designer or you're clueless.
Wayne Dohnal 11/22/14 11:38am Tech Issues
RE: Kill a watt, how accurate?

I have 2 of the P4400s and have found both to be surprisingly accurate after cross-checking them with a few other measuring devices including a revenue meter. Many light bulbs and heaters don't come very close to their advertised wattage, plus you have to know what voltage they're rated at to even know what to expect. As an example, while the standard rating voltage is 115, almost all hair dryers are rated at 125 volts. Because of this "nobody" will ever get the rated performance, but the higher wattage looks good in the advertising. The only places I've found the P400 lacking are the frequency and power factor readings with "modified sine wave" power. Even with MSW, the other functions give what looks to be good true RMS readings.
Wayne Dohnal 11/15/14 09:17am Tech Issues
RE: Loud Onan 4K Genny

Here's a thread about the Onan valve spring problem Onan broken valve spring And a link to the service bulletin http://www.irv2.com/forums/attachment.php?attachmentid=3548&d=1269626081
Wayne Dohnal 11/14/14 08:37pm Tech Issues
RE: Loud Onan 4K Genny

Never mind how today's Cummins's "Onan wannabe" generators are cooled, or oiled, or filtered, or how many cylinders they have ... how RELIABLE are they?Mine broke both valve springs at about 20 hours. There were hundreds, perhaps thousands of KY series generators that suffered the same fate at various Hobbs readings. I was lucky that my damage was limited to the springs. A lot of them sucked a valve and required total replacement.
Wayne Dohnal 11/14/14 03:56pm Tech Issues
RE: Loud Onan 4K Genny

I say exactly the same thing about my factory installed micro"quiet". Others say they are really quiet and the difference is the installation. When I'm boondocking I carry an eu2000i to charge the battery. For short times like running the microwave I just put up with the noise. It is pathetic IMO that the current built-ins haven't caught up to 10+ year old consumer technology.
Wayne Dohnal 11/13/14 12:46pm Tech Issues
RE: Honda Generators

The OP specified the eu3000 Handi. Its power specs are: AC Output 120V 3000W max.(25A) 2600W rated (21.7A)
Wayne Dohnal 11/12/14 05:36pm Tech Issues
RE: Rooftop Heat Pump Lockout Strategy (or lack of)

I'm fairly confident that the strikeout algorithm is in the thermostat's software, so you're not going to change it. You could hot-wire at the thermostat output to keep it running, but then you'd lose temperature control. Another option would be to find another thermostat, but then you'd lose the gas heat/electric heat integration. You could do it with an additional thermostat, moving the electric heat control wire over to it. I'm annoyed by the thermostat's insistence of running the gas heat when the spread between the current temp and desired temp gets too large. Sometimes I don't want the dang gas heat running and want to wait for the heat pump to do the job. The workaround of course is to chase the temp setting up as the heat pump runs, a pain in the neck. As to "why", it's just somebody's bad idea of how it should work.
Wayne Dohnal 11/11/14 05:09pm Tech Issues
RE: November 1956 IBM aanounces the worlds First hard drive

I'm really surprised to hear the first disc was so big, capacity-wise. The first one I worked with was in the 60s, from Digital Equipment, 32k 12-bit words. When we went to a megabyte platter, that felt like sci-fi. My college prof talked in terms of terabyte capacity. I thought he was a fruitcake, but he got the last laugh.
Wayne Dohnal 11/06/14 08:22pm Technology Corner
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