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07-10-2009, 03:55 PM | #1 |
Not Yet Wild
Join Date: Jul 2009
Posts: 20
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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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07-10-2009, 04:27 PM | #2 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,358
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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: |
07-10-2009, 05:21 PM | #3 |
Not Yet Wild
Join Date: Jul 2009
Posts: 20
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Re: 240-ohm resistor across main power solenoid?
Makes perfect sense, thanks! I'll make sure they replace it!
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