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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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05-05-2019, 07:14 PM | #1 |
Not Yet Wild
Join Date: May 2019
Location: Saint Augustine, FL
Posts: 2
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Rxv Brake only getting 12v to connection
Recently acquired a 2009 ezgo rxv. The issue I知 having is the cart will sometimes have a motor brake failure during start up. Then if if the cart passes and able to go forward or backwards is slow moving like the brake is still engaged. I致e already replaced the motor brake and the speed sensor. When I check the voltage to the brake when in forward I知 only getting 12v. But when I put it in tow mode I知 getting 48v. I知 stuck on what to look for next.
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05-05-2019, 08:25 PM | #2 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: Rxv Brake only getting 12v to connection
Quote:
That being said, the voltage being that low does indicate that the motor brake you installed is likely a Heavy Duty motor brake instead of the OEM motor brake that MUST be used on your RXV. With an OEM motor brake, current regulation should resuult in 24 to 36V across the motor brake coil. HD motor brakes draw too much current (due to lower coil impedance) and will result in unreliable operation and eventual failure of the controller! |
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05-06-2019, 04:31 AM | #3 |
Not Yet Wild
Join Date: May 2019
Location: Saint Augustine, FL
Posts: 2
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Re: Rxv Brake only getting 12v to connection
When I tested the voltage for the brakes it was without the brake being connected. So no current is being applied to the brake wires just voltage. Also I installed a standard brake in the cart not a HD.
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05-06-2019, 08:27 AM | #4 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Rxv Brake only getting 12v to connection
PWM usually tricks a digital volt meter when zero load is applied to the circuit, I bet a different meter would give a different reading on that same test. I suggest that test while the brake is plugged in, you might get suprised with a higher reading.
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05-06-2019, 01:08 PM | #5 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: Rxv Brake only getting 12v to connection
Quote:
If you keep messing with I/O pins like this, you are going to hit something critical (like the reverse buzzer), which will kill the controller if disconnected from its I/O pin! The RXV is unlike most other carts before it. The harness wires are not connected to pins that are single state, either an input or an output. Controllers in older carts were like that. Not anymore. The TXT48 from 2010 to current date also uses a controller with multistate pins. Not as fragile as the RXV controllers, but still easier to damage than older controllers. With the RXV, all I/O pins are multistate, and when they are in output mode, they monitor their own output while outputting. Applying potential from a multimeter can confuse an input, or even damage it! |
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05-07-2019, 01:20 AM | #6 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Rxv Brake only getting 12v to connection
Ouch, I guess I said it all wrong. But, a basic voltage reading on a PWM circuit is basically useless, and reckless on any Rxv circuits. Should be avoided. I was not on point on that one.
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05-07-2019, 03:40 AM | #7 |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: Rxv Brake only getting 12v to connection
You were on track. I just wanted to explain why, in detail. This is so others reading this can learn and not make the same mistakes, or those that have killed their RXV controllers can understand why...
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Tags |
rxv auto brake lock, rxv auto-brake problems |
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