HenryJavaJunkie
New Member
Hi,
Recently I was able to get an espresso machine dirt cheap as the previous owner said he forgot how it was wired after he took it apart for cleaning.
Well it looked like the cleaning was left off as well, as I cleaned out about 2 golf balls worth of hard scale rattling inside the boiler and a cumulative third from the other components.
Anyways back to the original problem, there wasn't much relevant information from the manufacturer or from third party sources on how it is to be wired to the control circuit. So after some careful investigation and scrutiny I reconstructed the circuit diagram, well the AC side of it at least. The DC side looks to be solely the Op-amp comparator that controls the relay switches.
The issue is that it looks like the only way to wire the machine's components correctly to the controller is so that the control circuit is Neutral switching. And I'm just not used to seeing this, so it's causing me some doubt, but I can't see it any other way. So I'm hoping someone can take a look at the schematic I drew up and/or educate me on why a circuit controller would be neutral switching.
To recap:
1. The machine is about 18 years old.
2. Circuit controller : Giemme MFC2SN
3. No manufacturers wiring diagram available. (Ive searched high and low for two weeks, in English and in ~ google translated Italian)
4. The CAD attached is what I've reconstructed.
My questions:
1. What are some reasons a control circuit would be neutral switching?
I've done some researching and reading but can't find anything solid. Except that it might be to prevent live voltage keeping the control circuit components energized and therefore leading to possible overheating and degradation.
2. Does the wiring of my CAD make sense with neutral switching?
Thanks.
Recently I was able to get an espresso machine dirt cheap as the previous owner said he forgot how it was wired after he took it apart for cleaning.
Well it looked like the cleaning was left off as well, as I cleaned out about 2 golf balls worth of hard scale rattling inside the boiler and a cumulative third from the other components.
Anyways back to the original problem, there wasn't much relevant information from the manufacturer or from third party sources on how it is to be wired to the control circuit. So after some careful investigation and scrutiny I reconstructed the circuit diagram, well the AC side of it at least. The DC side looks to be solely the Op-amp comparator that controls the relay switches.
The issue is that it looks like the only way to wire the machine's components correctly to the controller is so that the control circuit is Neutral switching. And I'm just not used to seeing this, so it's causing me some doubt, but I can't see it any other way. So I'm hoping someone can take a look at the schematic I drew up and/or educate me on why a circuit controller would be neutral switching.
To recap:
1. The machine is about 18 years old.
2. Circuit controller : Giemme MFC2SN
3. No manufacturers wiring diagram available. (Ive searched high and low for two weeks, in English and in ~ google translated Italian)
4. The CAD attached is what I've reconstructed.
My questions:
1. What are some reasons a control circuit would be neutral switching?
I've done some researching and reading but can't find anything solid. Except that it might be to prevent live voltage keeping the control circuit components energized and therefore leading to possible overheating and degradation.
2. Does the wiring of my CAD make sense with neutral switching?
Thanks.