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Post Info TOPIC: Waeco Powersupply
habana


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RE: Waeco Powersupply
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I have a CF-50 which has the signs of a dodgy polyfuse and Waeco have confirmed from my serial number that it is one of those affected. Out of warranty of course and in any case there is no service agent where I live. I am/was an electronics engineer so I should have no problem fixing the PSU, particularly after DeBe kindly posted the circuit diagram. However, I know nothing about refrigeration and am a bit concerned about moving the compressor to a point where I can remove the PSU. There is obviously the possibility of damaging the possibly work hardened copper pipes that go up into the fridge. One of the photos above shows at least one of the rear mounting brackets bent back, presumably so the compressor can pulled out sideways rather than dropped down. Is this the way to proceed? Any help with pulling the thing apart would be appreciated.

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DeBe


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Hi, You should be able to remove it without shifting the compressor. The only parts i moved was bend one bracket as shown, & moved the reciever drier (cylinderical copper object with a capilliary tube coming from it.) The polly fuse is a light brown square thin object by the relay.



-- Edited by DeBe on Thursday 28th of June 2012 07:36:36 PM

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DeBe


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Hi Rippah, The part is V1 & its a MOV, 7D431K. The replacement is avalable from Jaycar RN-3406 for $1.75. Its a surge protector which in an over voltage situation can be destroyed & blow the mains fuse on the board.



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Rippah


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Blew up my fridge on 240V a little while ago. My fault, using a mate's crappy $2 gennie, that will learn me!
Anyway, can anyone identify the capacitor that was in the red circle? All of it's mates are 472M and I'm assuming it's the same, however, it does appear to be a little smaller in size in other images.
IMG_0515.jpg


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Cruising Granny


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The first sign of trouble when my Waeco 240V circuit board died wa a blown fuse. I replaced the fuse but it went again.
So I'm running it on a transformer 240v-12v at the moment with a new circuit standing by to be installed.


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dorian


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Thanks for the useful info, DeBe. Much appreciated.


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DeBe


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DANFOSS comp.1.JPGTo test a compressor & its module, remove wires from C & T  then bridge them with a jumper. The compressor should run, this test was done on 12V if using the in built powersupply it will be 24V. The 2 top thick wires are also the best place to check for run voltage.



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DeBe


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WAECO CD-40AC VERA SMPS.JPGHere is the circuit as an aid for anyone who is capable of repairing one. I should point out that the 24V DC side is isolated from the 240V AC side.



-- Edited by DeBe on Saturday 30th of April 2011 12:31:05 PM

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DeBe


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Another potential fault in the powersupply is failure to start up. This can be caused by R2 100K 2Watt metal film resistor(10c part) It can go high in value or open circuit. Its used to kick start the SMPS at turn on.



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BobnBev


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Very true, I have a lot of bits if you were looking for anything ,, Just give me a pm ....

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DeBe


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Hi Bob, Unfortunatly this isn the first time people have been charged that mutch to just replace the powersupply board. I suspect that it wouldnt cost mutch to repair the board.



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BobnBev


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Yes also saw that and wondered why some one would spend that amount getting it fixed when a new board would be much less than that..
Have a box full of bits just like that, they just need going over .....
Not many people will pull the back off their fridge and solder bits to it and change wires....
Have let the smoke out of a few at times..big smile..
Have a good easter ......
Bob

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DeBe


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Waeco Ps2.JPGWaeco Ps bypass.JPGTo bypass the 240v powersupply if nolonger working Remove Red+ wire from the DC socket & White + wire from the circuit board which comes from the powersupply. Run a thick red wire from the DC socket+ to the Circuit board + where the White wire was. The fridge should run on 12V now.



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DeBe


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Waeco Ps2.JPGWaeco Ps4.JPGWaeco Ps5.JPGWaeco Ps6.JPGWaeco Ps10.JPGWaeco Ps14.JPGOn another Forum i noticed a person was charged $460 to get his Waeco fridge repaired as it wouldnt run on 240V. It had been running on aYamaha digital sinewave generator, this should not have been a problem. this got me thinking as i have a 3yr old CF-40 Waeco, what could go wrong with these powersupplys? I removed mine from the fridge & checked it out. First thing i noticed is a very small relay to automaticly change from 240V to 12V, its actually switching 24V from Powersupply to 12VDC, its ratings are240VAC 7Amp, to use it in a low voltage situation you can atleast halve its rating. This Relay is a potential cause of problems & dry solder joints on the board. If the 240V side of the power supply has been subject to over voltage there is a fuse soldered to the board worth checking. Next part that may fail in this situation is the 240V bridge rectifier ($5). Q1 is a IRFPC50 mosfet may also be damaged ($15) this is the most expensive part in the powersupply. There is also one capacitor that may fail C4 100Uf 35V. On the 24VDC side of the powersupply is 2 Caps that may cause problems eventualy if they dry out C16/19 2200Uf 35V. This powersuply is out of a 3Yr old CF-40 Waeco.



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