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SX460 Voltage Regulator for Old Onan Generators


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  #41  
Old 04-12-2017, 10:30:09 AM
LRomero LRomero is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

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Originally Posted by mheltunen View Post
Vanman, now that is getting a bit over my head. What would be the pros/cons to setting it up in that manner? I'm currently undecided on where I will use the set. I have two options, a remote hunting cabin which it would be used for 120v only (using only one leg of the ac output) or a possible backup for my home. For home use I would use both legs of the ac.
For the hunting cabin scenario: pulling only on one leg all the time is not ideal for the generator due to the load will be unbalanced. What you will want to do is use a 220v panel and then split up your loads (circuits) in the cabin so that you balance the load as best as you can. Some loads on one leg and some loads on the other leg. Ideally, you'd be better off with a 120v generator at the cabin.
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  #42  
Old 04-12-2017, 11:56:12 AM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

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Originally Posted by Vanman View Post
If the regulator is capable of 240 volt sensing, connecting it for such will result in considerably better regulation that is possible if connected for 120 volt sensing.
This isn't really helping the OP. I'd strongly suggest just leaving it sensing 120V. That is good enough and all the JB and JC sets left the Onan factory in this configuration.

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Originally Posted by LRomero View Post
For the hunting cabin scenario: pulling only on one leg all the time is not ideal for the generator due to the load will be unbalanced. What you will want to do is use a 220v panel and then split up your loads (circuits) in the cabin so that you balance the load as best as you can. Some loads on one leg and some loads on the other leg. Ideally, you'd be better off with a 120v generator at the cabin.
I'd suggest that we jump off that bridge after we come to it. For now, let's help the OP get his set running and the SX460 installed. These various tweaks can come later...
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  #43  
Old 04-12-2017, 10:15:22 PM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

So, here's how I fitted a SX460 into my JB set. Looks like I ditched the original Onan breaker, and put an aircraft style one in its place. It's rated 2.5A. A fuse would be just as good. The 5 ohm resistor is mounted on the back side of the aluminum plate and shows up in the 2nd picture.



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  #44  
Old 04-12-2017, 10:45:15 PM
mheltunen mheltunen is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Thanks for posting the picture Jim, I'm a visual learner so this helps a lot.

---------- Post added at 10:45:15 PM ---------- Previous post was at 10:43:48 PM ----------

Curious though, why did you decide to ditch the original breaker? I've been leaning towards using it myself.
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  #45  
Old 04-13-2017, 12:50:57 AM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

I'm guessing it was bad. If yours looks good, just use it.
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  #46  
Old 04-13-2017, 05:14:32 PM
mheltunen mheltunen is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Update: Got it mounted and wired up. Just waiting for my resistor to arrive.
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  #47  
Old 04-13-2017, 05:16:37 PM
mheltunen mheltunen is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Plan is to use the aluminum block as a heat sink for the resistor. Perhaps overkill but I had it hanging around from an old project
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  #48  
Old 04-13-2017, 08:30:45 PM
moteurdelco moteurdelco is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

dont connect the resistor in the ac input circuit;but in serie with the dc output.
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  #49  
Old 04-13-2017, 08:45:24 PM
mheltunen mheltunen is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Good catch... pays to post pics. Better to bruise the pride vs smoking the set. Thanks
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  #50  
Old 04-19-2017, 08:58:58 PM
mheltunen mheltunen is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Revised wiring of new board.
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  #51  
Old 04-20-2017, 07:10:16 AM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

I have bought one of these to. I was going to wire it next weekend it for my 4.5BGD commercial. I have a split phase to single phase 240-120 auto transformer on my unit. I was going to install sensing circuit to 120 volt output . Should this work ok? Should I get a resistor for it as well.?
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  #52  
Old 04-20-2017, 08:13:46 AM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

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Originally Posted by willie1959 View Post
...Should I get a resistor for it as well.?

What's the field resistance resistance?

How much field current does it need?

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Originally Posted by mheltunen View Post
Revised wiring of new board.
So, how's it work? (or haven't you tested it yet?)
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  #53  
Old 04-20-2017, 09:01:13 AM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Field resistance is about 21-23 ohms. I have been told that the field current is too high for these units its can go above 5 amps. I have been using battery power for two years from my solar system with a 3 way switch to change from 38 or 52 volts DC. At 38 volts max out put from generator is 2400 watts 112 volts a/c and switched to 52 volts will produce 3500 watts at 112 volts loaded. I was thinking of putting a regulator back in if I could cheaply.

This unit has 3800 hours on it and is used every weekend for heating at night when required...

The cold weather has screwed three boards here. I think its the dampness

http://www.utterpower.com/voltage-excitation/
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  #54  
Old 04-20-2017, 09:22:52 AM
Seafarer12 Seafarer12 is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

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Originally Posted by Jim McIntyre View Post
This isn't really helping the OP. I'd strongly suggest just leaving it sensing 120V. That is good enough and all the JB and JC sets left the Onan factory in this configuration.



I'd suggest that we jump off that bridge after we come to it. For now, let's help the OP get his set running and the SX460 installed. These various tweaks can come later...
If you can make improvements on it during initial install why not? You made an improvement on it changing the circuit protection.
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  #55  
Old 04-20-2017, 10:13:45 AM
mheltunen mheltunen is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Jim,

Have not had a chance to test it yet. Started re assembling the set today and need to go thru it checking my connections and torque specs. (Replaced head gasket). For setting the adjustments on the board, can it be done using one of the two legs ? Or should I tie the t leads together for 120v only output?
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  #56  
Old 04-20-2017, 12:05:51 PM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Quote:
Originally Posted by willie1959 View Post
Field resistance is about 21-23 ohms. I have been told that the field current is too high for these units its can go above 5 amps.
OK, well you don't need to add resistance then. But, yeah, 5A is above the continuous rated current for an SX460. You could try it and see - Not really an expensive science experiment...

Quote:
Originally Posted by Seafarer12 View Post
If you can make improvements on it during initial install why not?
Why not? Because earlier in this thread he stated that switching to 240V sensing was over his head. So it's a safe bet he has limited electrical knowledge and making a suggestion to re-wire his genset to 120V-only, without telling him how to do it, isn't helping him solve the problem at-hand and draws attention away from the real issue. THAT'S why not.

The context here is the guy has a genset that had a bad regulator. Let's take one step at a time, rather than jumping in with random 'improvements' unrelated to the original problem.

Once he gets his genset working, then yes, this might make sense - and that's what I said: "these tweaks can come later".

Quote:
Originally Posted by mheltunen View Post
Jim,

Have not had a chance to test it yet. Started re assembling the set today and need to go thru it checking my connections and torque specs. (Replaced head gasket). For setting the adjustments on the board, can it be done using one of the two legs ? Or should I tie the t leads together for 120v only output?
To keep it simple, just measure one of the 120V legs. They should each be about the same, so it doesn't matter which one you pick.
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  #57  
Old 04-20-2017, 12:24:11 PM
mheltunen mheltunen is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

That's a fair assessment Jim. I have basic electrical knowledge. Give me schematic and I'm able to do basic trouble shooting and testing. I did wire my own house (and it still works) so I consider myself fairly handy and when I'm in over my head I tend to research and ask questions to further educate myself. This whole process of getting my set running I've found very interesting and challenging at times. I have greatly appreciated all the input, tips and help from everyone who has commented.
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  #58  
Old 04-20-2017, 02:55:05 PM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Willie can you measure the current when you have it switched to 52V that would give you some idea of whether the current does in fact approach 5 A. At 20 ish ohms I make the current around 2.5A at 52V so an actual measurement would be helpful. Cheers Dan
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  #59  
Old 04-20-2017, 03:16:12 PM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

I will next week going to the camp Monday someone on this board told me it may take up to 5 amps on peak

http://www.ebay.ca/sch/i.html?_from=...e+dhg&_sacat=0

this what I have

also I have bought a 5.5 kw avr unit from china $18.00

http://www.ebay.ca/itm/GAVR-8A-Unive...3D171055367164
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  #60  
Old 04-20-2017, 04:45:03 PM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

http://www.ebay.ca/itm/AC-110V-220V-...item1c50e08aa7


Get one of these meters excellent for my off grid to monitor power from inverter and generators . Checked mine the other day have used 140 kw since jan 1.
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