XM-3000 Dead!

If the controller saw full throttle (5v) when you turned the key it might have tripped protection. It's normal to have a 5v or (4.8v) control voltage coming from the controller. That goes to the throttle and then is sent back varying on the position of the handle (0v-5v). Sounds like it might be stuck on full throttle. I doubt you fried anything. One of the leads (I think it's white or blue) should vary in voltage between 0v-5v when you twist the handle or the throttle isn't working right.

Yes if it's working right (I think) and yes. Do you keep getting the thump at startup?

If the signal is 0v coming out of the throttle and doesn't change when you twist the throttle, then that's the problem (remember to put the kickstand up). You could test this by putting the bike on the center stand and then hooking a potentiometer (old volume control from something lying around or radio shack) to that 4.8v coming out of the controller and watch the voltage goes up and down as you turn the knob. If you run that line to the controllers throttle in lead, as long as the volume is down when you turn the bike on you should be able to work the throttle with the pot.

I'm not that familiar to how the actual throttle works but I know it should vary the voltage from 0v-5v.

I hope this helps.

Sometimes the brake switches can stick also. I'm sure you'd notice, but thought I'd mention it, as it happened to me once.

Is it resistive? That is, can I measure varying resistance when I turn the throttle

Hi Mike,

No the throttle is not resistive

It's a hall effect throttle

There's 3 wires, one is 5V (red), another is 0V (black), and the other is 0-5V depending upon throttle position (white)

its the voltage between black and white that should be measured

Matt

As long as the brake lights are going off you can rule out the brake switches and kickstand switch.

The 72601 seems like a little much for the 3100 but you would like it. You could get by with the 72451 also.http://kellycontroller.com/keb7245124v-72v150a45kwe-bike-brushless-controller-regen-p-277.html

I don't know if your motor is the same as the 3500li but I suspect it is. I have a 3500li and use a kelly KBL12251 (now called KBL09251) controller and have run my scooter on up to 28 cells (89.6 nominal voltage) It does 54mph on 28cells and 48mph on 24cells. You will be able to hook a laptop to the controller and raise the low voltage cutoff to match the # of cells you use. (# of cells X 2.5v for lifepo4)
Also you can turn on regen braking so that when you twist the throttle off it will act like engine braking and generate power back to the batteries. How many batteries does your 3100 have? Type,amp hours?

If you wind up trying to go over 90v the KEB72601 it will not work. At voltages over 90v it shuts down, that's why I had to use the KBL12251, my pack fully charged was over 90v. I doubt you will want to do this but thought it worth mentioning.

This is likely the charger you would use if you choose to raise your voltage a little to 72v nom.
http://kellycontroller.com/f7210-72v10a-charger-p-108.html

Mike, as for the controller output current, maybe someone more knowledgeable will answer, as I don't know. I believe it would be measured in amps or KWs though.
Good luck, have a nice day off.

Another upper limit to high voltage is the insulation thickness in the coils in the xm3000 and xm3150 motors. Does anyone know of coil shorts from people who over-volted their xm's? 90 volts nominal is around 100 volts maximum. Can the xm-3000 windings/coils in the brushless motor handle that?

Jason

Hi voltage insulation not the real limit to coil lacquer in our motors, but rather it's temperature class. The best stuff goes up to somewhere around 220°C /428F, above which it will begin to decompose and eventually burn away. So high currents will fry the coil way before high voltage could cause shorting...

I wonder if you could motor up a big hill, lay your bike down and fry an egg on the hub. Who want's to be the first to try?

It's usually the controller that goes first. The motors can handle the voltage, they actually run cooler. But like meroller said, it's the current that gets you. In a place like Florida it's real flat. So you get up to speed fast and then the draw goes down. I've never tried this stuff on any real long hills at full speed, but my xm3500li handled up to 95v max even without the Kelly in moderate driving. I did it the first time just using a couple 12v car batteries mounted under the seat. I think Mike could do this. Cue mad scientist laugh!