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05 /13/ 24, 5:21am

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Subject: AC System Controls Author: Don Duncan [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 01/ 22/ 03, 4:42pm 1980 FC31 Hello, Can someone help me out with the following questions: 1. I have two AC voltage meters by the sink. The bottom one reads the outlet voltage accurately, at least by the sink. The top one always reads 10 or 15 volts lowers. Anyone know what the intended purpose is of the top meter. 2. Why does my rig have a manual transfer switch for generator, 30 and 50 amp shore AND an automatic transfer switch under the sink(relays)? Is the automatic switch an add on and not original to the rig? 3. Is there another hidden transfer switch by the redi-line somewhere that I should be looking for when I replace it? Any or all of the above please. My manuals don't cover these. Thanks, Don [ Next Thread | Previous Thread | Next Message | Previous Message ]

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[> Subject: Re: AC System Controls Author: Rich D. [ Edit | View ] Date Posted: 01/ 23/ 03, 4:12pm Hi Don, Question 1. There two AC Voltmeters because you have two "legs" of AC voltage when hooked up to a 50 Amp hookup. These two legs actually provide a total of 100 amps. 50 on leg 1 and 50 on leg 2. The voltage may fluctuate between the two for several reasons. The campground may have a heavier load on one or the other or your coach may; ie an air conditioner and electric hot water heater on one leg and very little on the other. When you are hooked up to a 30 amp hookup the 30 amps are divided between both legs and the volt meters should read the same. If they don't, one or the other are not calibrated correctly or there may be a poor connection somewhere in that leg. With the 30 amp. hookup you must add the total of your two Amp. meters and not exceed 30 amps total. With a 50 amp hookup you can draw up to 100 amps but should never exceed 50 on either leg. Questions 2 & 3 I do not know if anyone has modified your electrical hookup but normally in your year coach, there is a manual transfer switch. The relays under the sink are probably used to switch between your inverter (redivolt) and to shore power when available. The relay should "click" in when AC voltage from any source (Gen, 30, 50,)is available and supply power from the Gen, 30,50, to the outlet, or whatever is hooked to that circuit. When AC voltage is removed, the relay cuts out and connects that circuit to the redivolt so you continue to have AC power (now being supplied by the redivolt/inverter.) Hope this helps. Rich D. [ Post a Reply to This Message ]

[> [> Subject: Re: AC System Controls Author: Don Duncan [ Edit | View ] Date Posted: 02/ 1/ 03, 5:00am Rich, Thanks, it was helpfull. My system only has one ampmeter so perhaps both legs are imposed on it, or is only shows coach draw, not AC. I'll probably have to open the box and see what goes where since some mods are in place. Sounds like yours has more guages than mine. I'll check the voltage at the top panel and see if there is a poor connection some where. My top front A/C unit blew a generator fuse when I first tried it, perhaps I have a short to locate and the low voltage on the top panel is sensing this. Niether guage worked at that point. Regards, Don [ Post a Reply to This Message ]

[> [> [> Subject: Re: AC System Controls Author: Rich D. [ Edit | View ] Date Posted: 02/ 2/ 03, 7:11am Don, Sounds like the ammeter you have must be for the DC (12V) coach load. You can verify this simply by reading it with no AC 120V power attached. If you are showing a draw, it is a 12VDC meter. Regards, Rich D. [ Post a Reply to This Message ]