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Old 05-09-2007, 06:37 AM   #1
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i'm knew to this so forgive any errors please.

I'M REPAIRING A PROBLEM WITH THE TRANSFER RELAY ON AN 85 FLEETWOOD SOUTHWIND ON A GMC CHASSIS.
WHEN THE GENERATOR IS STARTED THE RELAY WON'T PULL IN.
IN OHMING OUT THE RELAY I FOUND THE COIL TO BE OPEN. ON CLOSER INSPECTION I FOUND THE RELAY TO HAVE A 120V DC COIL. I WAS SURPRISED TO FIND THE COIL TO BE DC. I ALSO FOUND ANOTHER RELAY WITH THE SAME DC COIL VOLTAGE STUCK BACK IN ONE OF THE CABINETS, ALSO WITH A BAD COIL.
THIS WAS BOUGHT USED A FEW DAYS AGO SO I DON'T KNOW ANY HISTORY ON THE PROBLEM.

I'M THINKING THE RELAY SHOULD HAVE A 120V AC COIL AND THATS WHY BOTH COILS ARE BAD.

ANY HELP WOULD BE GREATLY APPRECIATED.
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Old 05-09-2007, 06:37 AM   #2
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i'm knew to this so forgive any errors please.

I'M REPAIRING A PROBLEM WITH THE TRANSFER RELAY ON AN 85 FLEETWOOD SOUTHWIND ON A GMC CHASSIS.
WHEN THE GENERATOR IS STARTED THE RELAY WON'T PULL IN.
IN OHMING OUT THE RELAY I FOUND THE COIL TO BE OPEN. ON CLOSER INSPECTION I FOUND THE RELAY TO HAVE A 120V DC COIL. I WAS SURPRISED TO FIND THE COIL TO BE DC. I ALSO FOUND ANOTHER RELAY WITH THE SAME DC COIL VOLTAGE STUCK BACK IN ONE OF THE CABINETS, ALSO WITH A BAD COIL.
THIS WAS BOUGHT USED A FEW DAYS AGO SO I DON'T KNOW ANY HISTORY ON THE PROBLEM.

I'M THINKING THE RELAY SHOULD HAVE A 120V AC COIL AND THATS WHY BOTH COILS ARE BAD.

ANY HELP WOULD BE GREATLY APPRECIATED.
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Old 05-09-2007, 08:32 AM   #3
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mikedwards, welcoem to iRV2.com. We are glad to have you join us here. The transfer switch should have a time delay before it is energized. This will allow the generator to warm up a little before putting a load to it. SOme of todays have solid state (electronic) delay controls and may put out dc voltage to the coil but I dont think so. If I get teh time I will try to research yours if you will give me the model #. Thanks.
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Old 05-14-2007, 04:57 AM   #4
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THANKS FOR THE WELCOME.

YOUR RIGHT ABOUT THE DELAY, IT DOES HAVE A DELAY TIMER THAT'S NON-ADJUSTABLE. I DIDN'T TIME IT BUT IT'S GOT ABOUT A 30 SEC. DELAY BEFORE APPLYING POWER TO THE COIL OF THE RELAY. NORMALLY I WOULD JUST PUT A METER ON THE COIL TO DETERMINE THE SUPPLY BUT IN DOING THIS THERE WAS BOTH AC AND A DC COMPONET IN THE LINE. I DIDN'T MENTIOND IT IN THE FIRST MESSAGE BUT BETWEEN THE COIL AND THE TIMER THERE IS A DEVICE THAT I HAVEN'T BE ABEL TO ID AS OF YET. IT'S ABOUT A HALF INCH IN DIAMETER AND AN 1 1/4" LONG (APP) WITH 4 LEADS, 1 PAIR GO BETWEEN NEUTRAL AND THE TIMER AND THE OTHER 2 GO TO THE COIL OF THE RELAY, IF I'M REMEMBRERING CORRECTLY. IT HAS AN ID NUMBER ON IT THAT READS "CFR-125", I'VE SEARCHED THE ENTERNET BUT HAVEN'T GOTTEN ANY HITS ON IT,I'VE ALSO SEARCHED THE FLEETWOOD SITE BUT FOUND NO HELP THERE.

THE MOTORHOME IS A 1985 FLEETWOOD SOUTHWIND, MODEL V ON A GMC CHASSIS.

THANKS FOR THE HELP.
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Old 05-14-2007, 06:02 AM   #5
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Mike,

(Typing in capitals makes it kind of hard to read.)

I had a transfer switch on my MH with a bad relay also. And the previous owner had changed it some time before I got it, so that replacement didn't last long. When I first started the generator after buying the rig, I discovered very high voltage - caused by the generator's need for servicing. It was up to about 160 VAC. That's probablly what wiped out the relay coil (and some other things like fridge and water heater control boards, which I had to also replace)

Anyway, I decided to buy a replacement relay (just the open frame relay component) from Grainger Supply, where I found an exact replacement - a 120VAC coil.

Then I wired in a standard wall switch in a little box next to the transfer switch housing, which picks generator voltage (when the generator is running) to turn on the transfer relay. So I have to manually switch the relay on and off for transfer. It's not important for turning on the transfer, but I like having manual control over the turning off proceedure before shutting down the generator. If I shut the generator down without having the shore line plugged in, the "whole house" inverter takes over and I like a clean transfer to that.

Hope that gives you something to think about.
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Old 05-16-2007, 09:09 AM   #6
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I've thought of doing something similar myself by feeding a switch from the timer output that would prevent the relay from pulling in untill the timer shifted to prevent premature loading of the generator.
In checking the voltage the ac level looked normal.

Thanks for the advice.
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