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SX460 Voltage Regulator for Old Onan Generators


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  #11  
Old 12-10-2014, 09:21:25 PM
len k len k is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Think those types want to be mounted to a heat sink, with that white thermal grease in between.
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  #12  
Old 12-10-2014, 09:53:54 PM
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Jim McIntyre Jim McIntyre is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Yep - they ought to be mounted to a metal something. I just bolted mine to the inside of the steel control box. You can skip the heatsink grease for this - it helps, but isn't needed for stuff like this...
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Old 12-10-2014, 10:35:43 PM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

I've used these before, I'ld use the thermal grease. A 25watt resistor without a heat sink is the same size as a ~2 watt carbon resistor. That implies they are heavily relying on heat sink to cool the package. The grease fills the gaps between the surfaces, even in a highly flat surface of a CPU sink there are alot of micro air gaps.
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Old 12-10-2014, 10:48:12 PM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

It doesn't matter that it's a 25W resistor. In this application, it is dissipating 8 Watts or less. If the OP has H/S grease use it, but don't sweat it if not.
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Old 12-10-2014, 11:02:31 PM
Nazrat Nazrat is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

So on your DKD, you just put the SX460 in connected to the 240v output, and then the excitor connected to the output of the SX460? The current transformer in my DKD is in series with the output, but it obviously doesn't have to be wired that way.

Thanks,
Tad
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  #16  
Old 12-10-2014, 11:36:59 PM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

The other thing I was uncertain about was where to hook up the ac sensing connections, the wiring diagrams I have seen indicate that it is hooked to the main windings. I believe that the JC has a separate winding which supplies the field only? Any thoughts?
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Old 12-11-2014, 12:04:28 AM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Quote:
Originally Posted by bigblockchev View Post
The other thing I was uncertain about was where to hook up the ac sensing connections, the wiring diagrams I have seen indicate that it is hooked to the main windings. I believe that the JC has a separate winding which supplies the field only? Any thoughts?
The SX460 can sense across 240V or 120V. The stock YD regulator is wired to sense 120V. It senses one of the 120V windings - I forget which one. Onan's wiring diagrams make it look as if there's a dedicated sense winding for the YD regulator, but there isn't.

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Originally Posted by Nazrat View Post
So on your DKD, you just put the SX460 in connected to the 240v output, and then the excitor connected to the output of the SX460? The current transformer in my DKD is in series with the output, but it obviously doesn't have to be wired that way.

Thanks,
Tad
I don't remember how I wired mine. As I just mentioned, the SX460 will work either way (120 or 240). The transformer in the DKD isn't used if you install an SX460.
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Old 12-11-2014, 12:08:21 AM
Jack Hottel Jack Hottel is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

The JC 12 lead YD genend has the input leads to the regulator labeled 1 and 2. 1 connects to T1 and 2 connects to T4 internal to the stator.
Jack Hottel
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Old 12-11-2014, 10:18:49 AM
PopsGarage PopsGarage is offline
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Jim, what issues are you thinking of on a brushed unit??
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  #20  
Old 12-11-2014, 11:22:13 AM
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Default Re: SX460 Voltage Regulator for Old Onan Generators

Sets with brushes typically need more field current. Maybe way more than the 4A this thing is rated for. Also, they generate more noise, so adding some sort of transient protection would be a good idea, to protect the regulator...
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