Your last generator Maintenance Run
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Popgadget
Elite Member
Looking at the schematic farther, there’s a varistor across the input of each bridge, most likely for surge suppression. There must be a good reason for adding parts, I’m curious what it was.
1) I don't know how that Generac control system operates.
2) General comment - one option a bridge+DC coils gives you is having the control push DC to that bridge under line-out conditions.
3) Keep point # 1 in mind
.Rgds, D.
Popgadget
Elite Member
1) I don't know how that Generac control system operates.
2) General comment - one option a bridge+DC coils gives you is having the control push DC to that bridge under line-out conditions.
3) Keep point # 1 in mind
Rgds, D.
Keep in mind that it’s not 12VDC, but 240 VDC minus the very slight loss through the diodes.
Understood, but in the power-world, generating low-current higher voltage DC from 12vdc is relatively easy.
I'm not saying that is what is going on...... just pure speculation on my part. I too am curious about those coils, and had been mulling that scenario over....
Rgds, D.
Popgadget
Elite Member
Just to make it more puzzling it appears that rectifier and varistor is integral to the coil, notice the “lump” in the wrap.
Industrial Toys
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The MOV kind of but not always suggests AC supply.
A Bridge can be used on a DC circuit to make it (polarity) idiot proof, especially, here where it is imbedded into the coil wrapping.
I have not been following this, but my best guess it has something to with with avoiding some unsafe condition, like some redundancy or safety feature. Making it impossible to energize BOTH coils, something like that.
A Bridge can be used on a DC circuit to make it (polarity) idiot proof, especially, here where it is imbedded into the coil wrapping.
I have not been following this, but my best guess it has something to with with avoiding some unsafe condition, like some redundancy or safety feature. Making it impossible to energize BOTH coils, something like that.
Popgadget
Elite Member
Nope. Take a look at the schematic. It’s just a choice to use DC rather than AC coils. They are interlocked with micro switches and a relay. There has to be a significant difference in the way that AC and DC coils drive the plunger, perhaps speed or acceleration?
I’ve done a google search and have found some information on the different behavior of the coils, but haven’t found anything definitive.
I’ve done a google search and have found some information on the different behavior of the coils, but haven’t found anything definitive.
Industrial Toys
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Are you talking coils in general or these coils specifically?
I have taken some interest in coils lately. Trying to understand the difference between AC and DC relay coils. AC needs something to prevent merely buzzing, usually something to make them hold their magnetism for an instant, like e piece of copper.
One thing I don't understand. I "Thought I remember" playing around with home made DC solenoids as a kid. I thought the nail went one way with one polarity and shot the other way with reversed polarity. So why aren't DC relays polarity sensitive?
Without knowing what's in that controller, it's more of just a connection diagram. FWIW I have never seen a coil connected via a bridge rect. In a world where an extra cent spent on some component that in the end is part of something costing a lot, putting a bridge in, is not just for the fun of it. I'm sure.
I have taken some interest in coils lately. Trying to understand the difference between AC and DC relay coils. AC needs something to prevent merely buzzing, usually something to make them hold their magnetism for an instant, like e piece of copper.
One thing I don't understand. I "Thought I remember" playing around with home made DC solenoids as a kid. I thought the nail went one way with one polarity and shot the other way with reversed polarity. So why aren't DC relays polarity sensitive?
Without knowing what's in that controller, it's more of just a connection diagram. FWIW I have never seen a coil connected via a bridge rect. In a world where an extra cent spent on some component that in the end is part of something costing a lot, putting a bridge in, is not just for the fun of it. I'm sure.
Popgadget
Elite Member
It started out as these coils specifically, as I researched the Generac switch to see if I could reverse engineer it to be controlled by my Onan OT switch as a secondary transfer in my shop.
Once I determined it had no impact on my use (which works great), it became a matter of curiosity as to why did Generac go to the expense to add the parts to make the coils DC.
Once I determined it had no impact on my use (which works great), it became a matter of curiosity as to why did Generac go to the expense to add the parts to make the coils DC.