lifted club cars - lifted ezgo
Home FAQDonate Who's Online
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Electric Club Car
Electric Club Car Electric DS, and Precedent golf cars



Post New Thread  Reply
Thread Tools Display Modes
Unread 11-22-2011, 02:15 PM   #1
Gone Wild
 
Join Date: Dec 2010
Posts: 458
Default Voltage leak to chassis from 48v series motor

Its a 1997 DS series cart that suddenly gave up the ghost. It appears that the speed controller has gone but the issue I am grappling with is that the motor is leaking voltage to the chassis. I disconnected motor terminals A2 S2 and S1 and left A1 connected to the B+ on the controller. With a multimeter (-) probe on controller B- and the (+) probe on the chassis I get 15v. When I disconnect the A1 on the motor and do the same probe there is 0v. I stripped the motor, blew out the inners with compressed air to get rid of the carbon dust and put in new terminal insulators. A continuity test of all four terminals to the motor housing shows no continuity. I test ran the motor connecting it directly to 2 batteries and it ran fine. The 15v leak is still there, anyone have any ideas on what to do next.
Golfdog is offline   Reply With Quote
Alt Today
BGW

Golf car forum Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum
   
Unread 11-23-2011, 07:11 AM   #2
haveacupofshutthe****up
 
Stevec3201's Avatar
Club Car
 
Join Date: Jun 2011
Location: Viera, FL
Posts: 739
Default Re: Voltage leak to chassis from 48v series motor

Quote:
Originally Posted by Golfdog View Post
Its a 1997 DS series cart that suddenly gave up the ghost. It appears that the speed controller has gone but the issue I am grappling with is that the motor is leaking voltage to the chassis. I disconnected motor terminals A2 S2 and S1 and left A1 connected to the B+ on the controller. With a multimeter (-) probe on controller B- and the (+) probe on the chassis I get 15v. When I disconnect the A1 on the motor and do the same probe there is 0v. I stripped the motor, blew out the inners with compressed air to get rid of the carbon dust and put in new terminal insulators. A continuity test of all four terminals to the motor housing shows no continuity. I test ran the motor connecting it directly to 2 batteries and it ran fine. The 15v leak is still there, anyone have any ideas on what to do next.
Do you think it's possible the voltage leak is going through the motor to the axle and then to the frame? Just a thought for you to consider...
Stevec3201 is offline   Reply With Quote
Unread 11-23-2011, 08:54 AM   #3
Mr. Helper
 
ForBruce's Avatar
Club Car
 
Join Date: May 2009
Location: NY Catskills & South carolina
Posts: 436
Default Re: Voltage leak to chassis from 48v series motor

as the windings of a motor age it is possible ( although not always the case ) for the insulation on the windingsto break down and short to the case.

When i test a commercial 3-phase motor a standard VOM (volt ohm meter ) will not always pick up the short due to the high resistance of the short and the battey voltage of the "VOM" at only 1 1/2 or 3-volts

an insulation breakdown meter will test at a higher voltage typically 500 with almost no amperage to do damage. This will definetly give you an answer

I suspect that at only 3 volts no short shows but as you increase to 48 volts
it is enough to leak to ground.
ForBruce is offline   Reply With Quote
Unread 11-23-2011, 02:31 PM   #4
Gone Wild
 
Join Date: Dec 2010
Posts: 458
Default Re: Voltage leak to chassis from 48v series motor

Quote:
Originally Posted by ForBruce View Post
as the windings of a motor age it is possible ( although not always the case ) for the insulation on the windingsto break down and short to the case.

When i test a commercial 3-phase motor a standard VOM (volt ohm meter ) will not always pick up the short due to the high resistance of the short and the battey voltage of the "VOM" at only 1 1/2 or 3-volts

an insulation breakdown meter will test at a higher voltage typically 500 with almost no amperage to do damage. This will definetly give you an answer

I suspect that at only 3 volts no short shows but as you increase to 48 volts
it is enough to leak to ground.
You are spot on. I took the motor to a Motor Rewinding firm and he tested it with his instrument and it showed the leak . He said that an ohm meter would not pick it up. He is going to clean out the motor and bake it in an oven and hopefully by Friday I will hear that its sorted. The carbon dust etc. can create a path for the current. Tks for the input
Golfdog is offline   Reply With Quote
Unread 11-23-2011, 02:48 PM   #5
Mr. Helper
 
ForBruce's Avatar
Club Car
 
Join Date: May 2009
Location: NY Catskills & South carolina
Posts: 436
Default Re: Voltage leak to chassis from 48v series motor

Quote:
Originally Posted by Golfdog View Post
You are spot on. I took the motor to a Motor Rewinding firm and he tested it with his instrument and it showed the leak . He said that an ohm meter would not pick it up. He is going to clean out the motor and bake it in an oven and hopefully by Friday I will hear that its sorted. The carbon dust etc. can create a path for the current. Tks for the input
He is dead right about the carbon dust....and once it creates a short..that trace will continue to conduct even if the dust is blown away.

I had ajob where the "BAKEaLITE" insulator became a full conductor. It got wet ..a spark was generated ...and the heat of the spark caused a carbon trace.....and the insulator became a conductor....

good luck on the motor..... it would be more reliable to just have the motor rewound and get it over with rather than just cleaning and baking with epoxy

this way you won't have to remove the motor twice....

And you don't risk damaging the controller as the short progresses
ForBruce is offline   Reply With Quote
Reply
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Electric Club Car


Thread Tools
Display Modes


Similar Threads
Thread Forum
91 DS 36V series motor? Electric Club Car
stray voltage on chassis Electric Club Car
stray voltage from cart chassis Electric EZGO
How hot should a series motor get? Electric Club Car
L T B series motor Golf Carts and Parts


All times are GMT -5. The time now is 02:46 PM.


Club Car Electric | EZGO Electric | Lifted Golf Carts | Gas EZGO | Used Golf Carts and Parts

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.