Rewiring Panasonic SD-200 Breadmaker

Re: Rewiring Panasonic SD-200 Breadmaker

I noticed though that there is a noticeable difference in motor sound without the capacitor connected. If it is a "start" capacitor, shouldnt it be connected momentarily to kick the motor over. I tried doing just that and touching the capacitor with the neutral wire kicks it over and then it runs fine without the wire connected.

Just wondering if the electronic circuit that is normally there does a kick start via a switch on board and if either way is going to shorten the life of the motor.

No it doesnt, because it is not a "start" capacitor at all; the motor is in a PSC configuration. It will sound different with the capacitor disconnected because there will be one phase missing; it will lack power and should not be run like this. It is also unlikely to start on its own without the capacitor because it wont know which direction to rotate in; in fact, you can reverse the motor by connecting the capacitor to the opposite supply wire. This does not mean the capacitor is a "start" capacitor though; it is supposed to be in circuit all the time. There is a triac on the PCB to control the motor, and that behaves just like a simple switch. There is no other control circuitry for the motor.

(Another geek point: the heating element is controlled by a relay - black square thing you can hear clicking on and off. This is more expensive and less reliable than the triac which controls the motor, but a triac has a voltage drop which leads to it giving off heat. With a small load like the motor, the heat will be minimal but for the heating element it would be considerable and would have to be quite a large device with a heat sink. Hence the use of two different types of "switch" for the two components of the machine.)

[A_M]

Re: Rewiring Panasonic SD-200 Breadmaker

Hi,

I know this topic hasnt been touched for while, but I had a question on the start capacitor. I have a Panasonic SD-251 which is basically the same as the 200 so I wired it up and all is working OK. I basically ripped out all components and left the capacitor on the circuit board to keep it tidy. I noticed though that there is a noticeable difference in motor sound without the capacitor connected. If it is a "start" capacitor, shouldnt it be connected momentarily to kick the motor over. I tried doing just that and touching the capacitor with the neutral wire kicks it over and then it runs fine without the wire connected.

Just wondering if the electronic circuit that is normally there does a kick start via a switch on board and if either way is going to shorten the life of the motor.

BTW thanks for the mod details.  

As your an electrician... You should Know...

If ya not... Dont touch......

If ya continue to play... Then your choice and any outcomes are for you to own.

[kingaboy]

Re: Rewiring Panasonic SD-200 Breadmaker

Hi,

I know this topic hasnt been touched for while, but I had a question on the start capacitor. I have a Panasonic SD-251 which is basically the same as the 200 so I wired it up and all is working OK. I basically ripped out all components and left the capacitor on the circuit board to keep it tidy. I noticed though that there is a noticeable difference in motor sound without the capacitor connected. If it is a "start" capacitor, shouldnt it be connected momentarily to kick the motor over. I tried doing just that and touching the capacitor with the neutral wire kicks it over and then it runs fine without the wire connected.

Just wondering if the electronic circuit that is normally there does a kick start via a switch on board and if either way is going to shorten the life of the motor.

BTW thanks for the mod details.

[Humphrey]

Re: Rewiring Panasonic SD-200 Breadmaker

Guys it has been a while since my last post.  I have just had a big attack of upgradeitis and bought a new machine and decided to give home roasting a try as well.  

I pulled out the old Panasonic bm and I have re-wired it and I have removed the circuit board and I have de-soldered the capacitor and soldered the motor wires to it as needed.

So I now have no thermal cut off I assume but seeing as I will be watching the roast at all times I hope this should not be an issue.  

I will let you all know how it goes.

Good decision barrel!!! -- you wont be able to go back to buying brown beans once youve had some successful roasts. :-) Ive also completely taken everything out of the BM in regards to circuitry. The only thing I left from the original BM circuit was the fuse. Should be fine (I guess) as our hasnt blown up or melted yet :-P However, we have a fan blowing across our entire roasting setting. Good for blowing away smoke, and keeping things cool.

Interesting find! I had assumed that the motor itself had an inbuilt temp cut out but maybe its on the board?

I cant say this sure cause I havent pulled the motor appart, but Im pretty sure the motor must have a temperature cut out inbuilt. Weve had it cut out, even though all of the circuit boards have been pulled out and thrown in the bin ;-) Although, we havent had it cut out since taking the floor off though. Leaves it open for chaff, but I havent noticed that to become a problem yet.

[barrel]

Re: Rewiring Panasonic SD-200 Breadmaker

Guys it has been a while since my last post. I have just had a big attack of upgradeitis and bought a new machine and decided to give home roasting a try as well.

I pulled out the old Panasonic bm and I have re-wired it and I have removed the circuit board and I have de-soldered the capacitor and soldered the motor wires to it as needed.

So I now have no thermal cut off I assume but seeing as I will be watching the roast at all times I hope this should not be an issue.

I will let you all know how it goes.

[caffeinefreak]

Re: Rewiring Panasonic SD-200 Breadmaker

I also removed the heating element, but plugged all the holes between the two sections. It is surprising how much hot air was blowing directly on the circuit board.

If I get problems in the future I will remove the base as well, thanks.

Simon

[Alistair1]

Re: Rewiring Panasonic SD-200 Breadmaker

Interesting find! I had assumed that the motor itself had an inbuilt temp cut out but maybe its on the board?

I havent had the same problem again after taking the bottom of the BM off. I do however lay the BM on its side and let the fan blow on the motor in between saving the data from the roast on the computer and getting the next batch of beans ready - not sure if that is needed but cheap insurance! I will remember this advice in case it ever happens again - I have an air compressor close by.

I cant believe how much Ive gotten into this roasting - Just loving the coffee!! Every roast is as exciting as the first one....well almost!

Alistair

[caffeinefreak]

Re: Rewiring Panasonic SD-200 Breadmaker

I am wondering if anybody has had a problem with the SD200 suddenly cutting out. I was roasting a batch of beans today and 13 and a half minutes into the roast the motor just stopped. I was forced to cool the beans probably about 3-4 mins shy of SC....not happy!!  

Hi Alistair

Have your vacuum cleaner set up to blow not suck and as soon as it stops, blast the motherboard with air, it starts almost immediately. But dont have the top control panel/lid on the machine. See attached photo.


It never happens first batch always the one following, I always give it a cooling blast between batches. I have removed the thermostat thats all. Also plugged all holes from circuit board area to bowl area stopping hot air coming through.

[Thundergod]

Re: Rewiring Panasonic SD-200 Breadmaker

I havent needed to do three batches in a row since, so its not a problem now that Im aware of it.

For structural integrity I was planning to leave the bottom on and do what I did to my popper i.e. add more air holes.

[Alistair1]

Re: Rewiring Panasonic SD-200 Breadmaker

Thundergod,

Did you solve the thermal cut out in the motor or did you take the bottom off too for ventilation?

Alistair

[Thundergod]

Re: Rewiring Panasonic SD-200 Breadmaker

Yes, we had this happen. We removed the thermal fuse from the circuit (although its probably wiser to leave the thermal fuse in circuit but tape it to the wall of the BM as far from the heat as possible - for safety), but there is a thermal cut-out somewhere in the motor circuitry itself (my guess). We also discovered this the hard way.

Same here.
Happened to me the first time I tried three back to back roasts.

[Alistair1]

Re: Rewiring Panasonic SD-200 Breadmaker

Thanks Stuart. I will try taking the floor off the BM and see if I still have a problem.

Cheers,

Alistair

[stuartgrant]

Re: Rewiring Panasonic SD-200 Breadmaker

Hi Alistair,

Yes, we had this happen. We removed the thermal fuse from the circuit (although its probably wiser to leave the thermal fuse in circuit but tape it to the wall of the BM as far from the heat as possible - for safety), but there is a thermal cut-out somewhere in the motor circuitry itself (my guess). We also discovered this the hard way.

See this thread for our experiences:
http://coffeesnobs.com.au/YaBB.pl?num=1215482236/


FWIW, we no longer have this problem - even when weve done three roasts back-to-back. This is probably because we took the floor off the BM (cant remember why - to fix something or other) and never put it back on. Because we have a fan running over the whole setup, the BM motor must get a fair bit of ventilation.

Cheers
Stuart.

[Alistair1]

Re: Rewiring Panasonic SD-200 Breadmaker

I am wondering if anybody has had a problem with the SD200 suddenly cutting out. I was roasting a batch of beans today and 13 and a half minutes into the roast the motor just stopped. I was forced to cool the beans probably about 3-4 mins shy of SC....not happy!!
I just turned it on again 10 mins later and it worked fine again. Has anybody else experienced this? I am wondering if there is a safety cut out if the motor gets too hot. This is the first time I have done two roasts quite close together - I would say I waited about 15 minutes after the first (which worked fine).

Alistair

[smokeydeck]

Re: Rewiring Panasonic SD-200 Breadmaker