New Alltrax simple voltage question.

Stevepeacock911 · 08-08-2018, 10:57 AM

New Alltrax 400pds controller on 2004 EZGO. With no motor hooked up, I am getting 36.4 volts at battery pack side of solenoid with key off and in run mode. My question: I am also getting 36.4 volts off the controller side of the solenoid with the key off as well. This is without the resistor across the big lugs of the solenoid. Is the 36.4 on the controller side of the solenoid normal?
With key on and throttle pressed lightly, contact closes as normal. I am just confused as to why there is 36.4 volts on the controller side of solenoid when the contact isn't closed.

LukeL · 08-08-2018, 11:03 AM

That should be normal. The XCT supplies the negative to the solenoid when the pedal is pressed.

Club Car DS driver’s club #59

JohnnieB · 08-08-2018, 11:40 AM

What you are reading on the controller side solenoid stud is the voltage on the filter capacitors inside the controller. These are kept at the battery pack voltage, or close to it, via J1 Pin-5 to reduce arcing on the solenoid contacts as they close. (The contacts bounce for a few milliseconds before they stay closed.)

That's the purpose of the pre-charge resistor on series controller solenoids and on previous sepex controllers. The XCT does not use a pre-charge resistor.

Stevepeacock911 · 08-08-2018, 12:11 PM

Johnnie, the new controller came with the precharge resistor and a small diode that goes across the coil terminals. Do I NOT need to install the large resistor across the large studs of the solenoid?

LukeL · 08-08-2018, 12:13 PM

Quote:

Originally Posted by Stevepeacock911

Johnnie, the new controller came with the precharge resistor and a small diode that goes across the coil terminals. Do I NOT need to install the large resistor across the large studs of the solenoid?

No, you don’t want a pre charge resistor for a Sepex Alltrax.

Club Car DS driver’s club #59

jeremy98 · 08-08-2018, 12:18 PM

Actually according to the diagram on Alltrax's website, it does require the resistor.

https://alltraxinc.com/wp-content/up...S-wire-dia.pdf

Stevepeacock911 · 08-08-2018, 12:31 PM

Jeremy, I have the XCT400 PDS controller. Is that the same as the diagram you posted for a DCT controller?

jeremy98 · 08-08-2018, 12:36 PM

My apologies! I was incorrect with my previous statement. From what I see on the correct diagram, Luke is correct and you do not need the resistor on the solenoid. You should install the diode though.
https://alltraxinc.com/wp-content/up...S-wire-dia.pdf

Stevepeacock911 · 08-08-2018, 12:45 PM

Oh, so maybe what I'm calling the precharge resistor(like on the stock Curtis controller) is actually the large diode that is attached to my paperwork at home? So I do need to install it on the big posts?

jeremy98 · 08-08-2018, 01:53 PM

The diode should be installed on the little posts (coil terminals). This is to help protect against voltage spikes going the wrong direction.

08-08-2018, 10:57 AM	#1
Stevepeacock911 Not Yet Wild Join Date: Jul 2018 Posts: 5	New Alltrax simple voltage question. New Alltrax 400pds controller on 2004 EZGO. With no motor hooked up, I am getting 36.4 volts at battery pack side of solenoid with key off and in run mode. My question: I am also getting 36.4 volts off the controller side of the solenoid with the key off as well. This is without the resistor across the big lugs of the solenoid. Is the 36.4 on the controller side of the solenoid normal? With key on and throttle pressed lightly, contact closes as normal. I am just confused as to why there is 36.4 volts on the controller side of solenoid when the contact isn't closed.

08-08-2018, 11:03 AM	#2
LukeL Gone Wild Join Date: Jun 2017 Location: Savannah, GA Posts: 6,539	Re: New Alltrax simple voltage question. That should be normal. The XCT supplies the negative to the solenoid when the pedal is pressed. Club Car DS driver’s club #59

08-08-2018, 11:40 AM	#3
JohnnieB Techno-Nerd Join Date: Jun 2011 Location: West Virginia Posts: 19,654	Re: New Alltrax simple voltage question. What you are reading on the controller side solenoid stud is the voltage on the filter capacitors inside the controller. These are kept at the battery pack voltage, or close to it, via J1 Pin-5 to reduce arcing on the solenoid contacts as they close. (The contacts bounce for a few milliseconds before they stay closed.) That's the purpose of the pre-charge resistor on series controller solenoids and on previous sepex controllers. The XCT does not use a pre-charge resistor.

08-08-2018, 12:11 PM	#4
Stevepeacock911 Not Yet Wild Join Date: Jul 2018 Posts: 5	Re: New Alltrax simple voltage question. Johnnie, the new controller came with the precharge resistor and a small diode that goes across the coil terminals. Do I NOT need to install the large resistor across the large studs of the solenoid?

08-08-2018, 12:18 PM	#6
jeremy98 Not Yet Wild Join Date: May 2017 Location: Carlisle, PA Posts: 47	Re: New Alltrax simple voltage question. Actually according to the diagram on Alltrax's website, it does require the resistor. https://alltraxinc.com/wp-content/up...S-wire-dia.pdf

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08-08-2018, 12:31 PM	#7
Stevepeacock911 Not Yet Wild Join Date: Jul 2018 Posts: 5	Re: New Alltrax simple voltage question. Jeremy, I have the XCT400 PDS controller. Is that the same as the diagram you posted for a DCT controller?

08-08-2018, 12:36 PM	#8
jeremy98 Not Yet Wild Join Date: May 2017 Location: Carlisle, PA Posts: 47	Re: New Alltrax simple voltage question. My apologies! I was incorrect with my previous statement. From what I see on the correct diagram, Luke is correct and you do not need the resistor on the solenoid. You should install the diode though. https://alltraxinc.com/wp-content/up...S-wire-dia.pdf

08-08-2018, 12:45 PM	#9
Stevepeacock911 Not Yet Wild Join Date: Jul 2018 Posts: 5	Re: New Alltrax simple voltage question. Oh, so maybe what I'm calling the precharge resistor(like on the stock Curtis controller) is actually the large diode that is attached to my paperwork at home? So I do need to install it on the big posts?

08-08-2018, 01:53 PM	#10
jeremy98 Not Yet Wild Join Date: May 2017 Location: Carlisle, PA Posts: 47	Re: New Alltrax simple voltage question. The diode should be installed on the little posts (coil terminals). This is to help protect against voltage spikes going the wrong direction.

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