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Electric Club Car Electric DS, and Precedent golf cars |
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02-27-2017, 08:12 PM | #1 |
Gone Wild
Join Date: Feb 2017
Posts: 175
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Precharge resistor values
The use of a precharge resistor is common knowledge to me but my question is why would a lower amperage controller require a different value resistor over a higher amp controller I.E. Alltrax requires a 470 ohm for 600 and up and standard 240 for smaller controllers.
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03-01-2017, 09:13 PM | #2 |
Gone Wild
Join Date: Apr 2015
Location: Athens, GA
Posts: 349
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Re: Precharge resistor values
I'll take a wag at it. The larger amperage controllers may have larger farad capacitors. If so, more inrush current would be present to charge the capacitors. A higher resistance value would lessen the inrush current. In contrast if the capacitors in the smaller amperage are smaller, there would be less in-rush current and a lower resistance value might be used. As prefaced, just a wag. Alltrax could answer for sure.
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03-01-2017, 09:38 PM | #3 |
Gone Wild
Join Date: Feb 2017
Posts: 175
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Re: Precharge resistor values
Thanks klanel, been trying to get in touch with alltrax for a few days with no luck
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03-01-2017, 09:46 PM | #4 |
Gone Wild
Join Date: Apr 2014
Location: Oregon City, Or
Posts: 1,977
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Re: Precharge resistor values
Don't quote me but I believe the resistor also helps reduce the arcing of the contacts in the solenoid. Higher amperage=bigger arcing=bigger resistor.
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03-24-2017, 01:04 AM | #5 |
Not Yet Wild
Join Date: Jan 2017
Posts: 5
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Re: Precharge resistor values
When I installed my new Alltrac XCT 400 IQ controller the Alltrex customer service rep said neither the diode nor resister is needed for the solenoid. The controller is designed to operate without either.
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03-24-2017, 08:19 AM | #6 | |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,418
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Re: Precharge resistor values
Quote:
The SR control requires both the pre-charge resistor and the voltage suppression diode. The XCT requires neither of these as both the pre-charge resistor and the voltage suppression diode are built in to the controller. |
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03-25-2017, 01:17 AM | #7 |
Not Yet Wild
Join Date: Jan 2017
Posts: 5
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Re: Precharge resistor values
Thanks for the clarification Scottyb!
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