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Old 07-10-2009, 03:55 PM   #1
wpns
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Default 240-ohm resistor across main power solenoid?

Anyone know the function of the 240-ohm resistor across the main power solenoid (in a 2001 Villager 6, but many others as well).

I broke mine while debugging a different problem yesterday, and I'm curious to know it's function, and how important it is to replace it immediately.

Thanks!
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Old 07-10-2009, 04:27 PM   #2
scottyb
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Default Re: 240-ohm resistor across main power solenoid?

It is important. Okay, here ya go..... best told why by the experts
But the short version is this:

The Pre-Charge Resistor:
The resistor, typically seen across the big terminals
on the contactor, pre-charges the filter capacitors in
the controller. This minimizes the voltage across the
contactor to reduce arcing on the contacts as they
close.
Closing the contactor without a pre-charge resistor
causes arcing on the contact surface and they can
become pitted. Plain copper contacts suffer the worst
as they cannot tolerate peak inrush currents. Excessive
pitting over time causes the contacts to weld together
or not make a good contact.
The pre-charge circuit draws little or no power. Its
purpose is to maintain the capacitors at battery pack
voltage so when the contactor is closed, no arcing

occurs. Resistor value is determined by pack voltage.

If you want to know more check out the PDF below:
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Old 07-10-2009, 05:21 PM   #3
wpns
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Default Re: 240-ohm resistor across main power solenoid?

Makes perfect sense, thanks! I'll make sure they replace it!
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