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Unread 07-02-2010, 10:39 AM   #1
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Location: Mountaindale, Oregon
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Default Pre-charge resistor for resistor carts?

From Alltrax Tech Note 010

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.
Question:
Is a pre-charge resistor necessary or helpful (for contact life) for resistor carts?
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Unread 06-14-2011, 12:17 AM   #2
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Default Re: Pre-charge resistor for resistor carts?

I have a 1995 ezgo DCS. The speed controller went bad. I replaced it, it works except the precharge resistor gets insanely hot after about 30 seconds of use. Any ideas?
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Unread 06-14-2011, 12:27 PM   #3
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Default Re: Pre-charge resistor for resistor carts?

from what i've seen on here you do need it if not it can damage your controller i think...........SCOOOOOOOTTTTTTTIIIIIIEEEEEEEEE-BBBBBBB !!!!!!!!!!!!!! WHERE ARE YOUUUUUU.......LOL
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Unread 06-14-2011, 02:18 PM   #4
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Default Re: Pre-charge resistor for resistor carts?

I know I need it. Was just curious if someone knew why it got so hot. Someone said it might be the motor cables rubbing against the frame and causing resistance. But I checked them, rather the mobile golf cart repair guy did, and they look good.
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Unread 06-14-2011, 08:46 PM   #5
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Default Re: Pre-charge resistor for resistor carts?

The only time mine got hot was it when my controller was going out and I know you said you u got a new 1 .... scotty or andy will know...
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Unread 06-20-2011, 10:55 PM   #6
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Default Re: Pre-charge resistor for resistor carts?

Quote:
Originally Posted by e-z-go1988 View Post
From Alltrax Tech Note 010

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.
Question:
Is a pre-charge resistor necessary or helpful (for contact life) for resistor carts?
Answer is no since resistor carts do not have an electronic speed controller.
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Unread 06-21-2011, 12:06 AM   #7
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Default Re: Pre-charge resistor for resistor carts?

PG is right. There is no pre charge resistor on resistor carts. If you upgrade to a controller, yes you need one for cheap insurance on your electric system.
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Unread 06-21-2011, 12:08 AM   #8
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Default Re: Pre-charge resistor for resistor carts?

just a late night thought...

Ya'll realize this thread was started a year ago? hmm... maybe keith.ericson would have received more attention had he started a new post?

@keith.ericson: sorry I can't help you :( did you ever find the cause?

Joe
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