Worth a try. Of to bed now its nearly midnight here.

 

Worth a try. Of to bed now its nearly midnight here.

goodnight!

 

I changed the black (mosfet 1) and the blue (mosfet 2) drain wires to the coils. Apparently drain signals do not change; I guess I can conclude the coils are not the cause of not starting. How to debug furtheron?

 

Considering the age of the unit & they do run fairly warm, i would replace all 3 electrolytic capacitors.

 

Considering the age of the unit & they do run fairly warm, i would replace all 3 electrolytic capacitors.

Ok will try that and be back

 

Hello, I would like to repair this brushless 12V fridge compressor motor (Danfoss 2.5) but first of all understand how it functions.
Inside are 3 coils.
It has an electronic driving unit: 2coils (photo 3)pin1-pin3 and pin3-pin4 of them are driven by mosfets. Total number of mosfets=3:
(the third one is for the fan). There is no mosfet driving the coil between connectorpin 2 and 3 ("WT" on PCB).
View attachment 220693I add a diagram (temptative).
View attachment 220694
View attachment 220692

I have the same unit - with a noddy problem. I need (external) wiring connections between the Danfoss unit (illustated 102N3033) and the connector block (illustrated). I planned to replace the compressor unit case (dissolved - rusted - in a boat) and disconnected these cables. I took a photo, fell off the ladder and smasshed the 'phone. I hope you can help.

 

First of all what is wrong with it? Heres some information from when i repaired one. These are a very old obsolete compressor, the controler has not been avalable for many years. They are the first generation Danfoss 12V compressor & are only one fixed speed. A lot of problems arise from low voltage, usualy from not heavy enough cable. T & C is analogue ON/OFF thermostat. The newer BD35F is mutch more versatile & draws less current & is variable speed. View attachment 220709View attachment 220710View attachment 220711View attachment 220712View attachment 220713View attachment 220716View attachment 220717View attachment 220718View attachment 220719View attachment 220720

Cheers for details about Patpin's set-up.

I have similar equipment, offering refrigeration on a boat. The unit ( and boat) are old and the steel case, which was hidden away, was found to be corroded and in pieces, which were funally spilling out. Owing to other work, the unit has been unused for a period.

A problem (incidentally) about a replacement compressor, is connections and re-gassing.

Your photos seem to show an integrated cable (to the compressor) connected into the control unit (102N3033).

Mine simply has an array of spade (fast-on?) tabs.

I have lost the photo showing the four connections from the compressor which I dismantled in accessing the metal case: my problem now is, which wire went to what terminal on 102 N3033.

There are options shown in other posts for other accessories: a fan (terminals C&F) and an LED.

I assume that a (separate) on/off switch unit on the boat (with monitoring circuitry) is fed by T & C. That unit poses other dilemmas.

A fan was included in the broken compressor case, but not wired in.

I hope you can advise where the four cables were conected.