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05-22-2013, 11:49 AM | #1 |
Gone Wild
Join Date: Aug 2008
Location: Ohio-In Summer, Central Florida-In winter
Posts: 889
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why would a motor blow a controller
Purchase a used Plum Quick Bandit. Previous owner stated that "while driving heard a sizzle type noise and Cart stopped. Thinking it was the motor and wanting a higher torque motor anyway purchased a D&D motor only to find it was the controller that was bad." So that being said, I too thought it was his controller that went bad and bought the motor. Installed it in my cart. First test run...cart moves maybe 1/2 inch and stops. Smell burning wires or similar. shut everything off, recheck all connections. Check for proper motor wiring, all good no melted or hot wires anywhere. Now all I get is a solenoid clicking. Nothing else. Blew MY controller!! WHY? Motor turns free and easy!! The guy had wanted me to tell him if the motor worked or not even though I bought it as is, no warranty. He is a standup guy and refunds my money. Surprise!! And THANKS!!! By the way he is one of our members!! Now anyone now why it would blow a controller? Thanks!!
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05-22-2013, 04:57 PM | #2 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: why would a motor blow a controller
Is it possible that the Field Coil is open in the Motor?
There would be no magnetic field so the motor would not turn and it would be like a stall/short condition with high current demand from the controller. Did you put an ohmmeter to the Field coils? |
05-22-2013, 06:02 PM | #3 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,417
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Re: why would a motor blow a controller
FYI the new line up Alltrax controls have output side polarity protection to prevent just this type of problem. Series cart controllers available only at this time.
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05-22-2013, 06:07 PM | #4 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,183
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Re: why would a motor blow a controller
Shorted armature or open field can blow a controller.
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05-22-2013, 06:21 PM | #5 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,183
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Re: why would a motor blow a controller
Field could also be shorted or shorted to Armature
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05-22-2013, 08:13 PM | #6 |
Gone Wild
Join Date: Aug 2008
Location: Ohio-In Summer, Central Florida-In winter
Posts: 889
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Re: why would a motor blow a controller
How would I go about checking these conditions that are presented here to find out what is wrong with motor? I did the motor test that was told on here..shorting A1 to F1 and A2 to F2 then applying power to A1 and A2. Motor turned but VERY slow @ 24v. By the way after reinstalling the old motor the solenoid no longer clicks when go pedal is pressed. Just so you now it is a SEPEX system.
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05-23-2013, 08:13 AM | #7 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: why would a motor blow a controller
The test you did with the motor in the cart, putting the coils in parallel, should have eliminated all of the conditions mentioned(unless you have some fancy compound motor...).
The shunt motor would run very slow at 24 volts, that should be normal. To perform some bench testing: Put your multimeter in a low ohms setting and test the following: A1-A2 = low resistance. F1-F2 = low resistance but it should be more than A1-A2 A1-F1 = open or infinite resistance. A1-motor body = open or infinite resistance. F1-motor body = open or infinite resistance. |
05-24-2013, 11:12 AM | #8 |
Gone Wild
Join Date: Aug 2012
Location: Apex, NC
Posts: 495
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Re: why would a motor blow a controller
Wow nice of the guy to refund your money!
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05-24-2013, 12:15 PM | #9 |
Gone Wild
Join Date: Aug 2008
Location: Ohio-In Summer, Central Florida-In winter
Posts: 889
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Re: why would a motor blow a controller
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05-24-2013, 12:50 PM | #10 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: why would a motor blow a controller
I guess the only thing that cannot be tested by these procedures is a short in the motor coils due to insulation melting.
For future reference, does anyone know an approximate cost range to have a motor shop test the coils on a growler? |
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