Re: 5KW 72V Controller 36 #4410 FET's, $108 #4110's $154

[methods]

That has been my experience. Any time I get a guy on the horn who speaks good English things just get worse. I would rather make smoke signals to Keywin than speak clearly to Sunny Chen over at 9C.

-methods

 

[The Mighty Volt]

That has been my experience. Any time I get a guy on the horn who speaks good English things just get worse. I would rather make smoke signals to Keywin than speak clearly to Sunny Chen over at 9C.

-methods

ROTFLMAO

You have an Irish sense of humour

 

[Gordo]

After my first few conversations with LEO at the beginning of this thread, I came to the same conclusion. He had to get back to me with many answers to questions I asked.

I think he just speaks the English and that others are charged with the engineering and tech jobs.......once you get a guy telling a guy telling a guy, that's usually an invitation for a breakdown somewhere.[/quote]

 

[flexy]

i can't seem to get regen working on my 36FET, I've tried the low brake signalwire which cuts the power but no regen, I've tried feeding 12V to the high ebrake which cuts the power but again no regen, the black jumper that switches on regen function is still intact.

Any ideas?

 

[bearing]

Did you ask for regen when you ordered it?

When I bought my greentime, they said their standard config is without regen.

 

[flexy]

yes i did ask for it, I can't understand why they would put the jumper wire in if it wasn't configured for it?

 

[bearing]

Ok, then I don't have any ideas.

 

[lionschasing]

I'm talking to Leo right now, he says it happens automatically when braking. I replied: my 36 fet has no resistance when braking, and another user's got the same problem
what pads should i check to solder to? i asked..waiting for reply

Ok, then I don't have any ideas.

 

[flexy]

John in CR wrote earlier that cutting the power to the halls activates the regen, I'm not confident at testing this but has anyone else tried?

 

[John in CR]

What voltage are you running? The HVC for regen is somehow dependent upon the LVC for battery cutoff. I've also been told regen can't work above about 84V no matter what.

Regarding cutting hall power to activate regen, I've seen that on one controller, not a Greentime, so if I said it here, then it was something to try.

FWIW, getting regen right with Leo has been a huge frustration for me, and I've bought 30-40 controllers from him.

John

 

[flexy]

i'm running 72V lifpo4 so does get up to 82V off the charge. I asked for LVC of 50V , I also asked for 200A peak but it's max was around 80A before modifying the shunt!

 

[John in CR]

i'm running 72V lifpo4 so does get up to 82V off the charge. I asked for LVC of 50V , I also asked for 200A peak but it's max was around 80A before modifying the shunt!

The LVC is probably what is shooting you in the foot. Get with Leo to find out what resistor needs changing to the the LVC up over 60. Shoot for 60-65V. There's no capacity to speak of below 3V/cell with Lifepo4, so that should be fine. Try running your battery down to about 70V just to be sure that regen is actually activated. Do you have any other packs or cells so you can check the actual LVC?

200A...What motor?....Pushing what total load?

Also, file the ends and corners of the heat sink fins. Mine pulled a Freddy Kruger imitation on me. Thank goodness I just brushed it with my leg, so they weren't deep.

John

 

[flexy]

i'm running 72V lifpo4 so does get up to 82V off the charge. I asked for LVC of 50V , I also asked for 200A peak but it's max was around 80A before modifying the shunt!

The LVC is probably what is shooting you in the foot. Get with Leo to find out what resistor needs changing to the the LVC up over 60. Shoot for 60-65V. There's no capacity to speak of below 3V/cell with Lifepo4, so that should be fine. Try running your battery down to about 70V just to be sure that regen is actually activated. Do you have any other packs or cells so you can check the actual LVC?

200A...What motor?....Pushing what total load?

Also, file the ends and corners of the heat sink fins. Mine pulled a Freddy Kruger imitation on me. Thank goodness I just brushed it with my leg, so they weren't deep.

John

Thanks John, I will give the LVC a test with a lower voltage,

Did yours have a slow acceleration ramp?, mine took an age to get going and wouldn't climb a steep hill until I modded the shunt, It's better now but no where near as nippy as my Lyen 18fet equipped scoot,

I guess it is much heavier than your setups but maybe I should have specified instant start...

Project here http://endless-sphere.com/forums/viewtopic.php?f=10&t=38617

 

[John in CR]

I only got one 36fet and that was in the very first batch I bought, so I don't know the throttle ramp setting or phase currents are. It came stock doing 137A peak though the label says 100A. It does start pretty smoothly, so it may be set for slow or medium current ramp up. Most of my experience is with their 18fet controllers on fastest ramp up, which is an uncomfortable jerk to start, but an 18 won't hold up on a scooter....Mine use dual controllers.

If you do ever get 200A, you better watch your motor heat.

John

 

[flexy]

John,you were right about the LVC affecting regen, my regen started to kick in around 65V, which is way too low, I'll see if Leo has a solution.

Another quirk I found was when using the 3 speed switch , on the lowest setting the motor won't even start until the throttle has already been twisted 75%, this makes me think the bike is switched off until it suddenly jerks into motion.

At middle speeds I'm getting oscillations, the controller ramps up the power to 4KW then drops off to 1KW and repeats every 3 seconds.
Maybe this controller doesn't match my motor very well, the controller doesn't get very warm even when climbing a long steep hill (7KW continuous), but the motor gets quite hot.

 

[lionschasing]

now that's interesting.......that's how I wiped out!!
I was opening the throttle relatively, and suddenly a large leap / oscillation occurred and I found myself on the floor... 36 fet definitely requires resistors / zombiess throttle controller to work

John,you were right about the LVC affecting regen, my regen started to kick in around 65V, which is way too low, I'll see if lLeo has a solution.

Another quirk I found was when using the 3 speed switch , on the lowest setting the motor won't even start until the throttle has already been twisted 75%, this makes me think the bike is switched off until it suddenly jerks into motion.

At middle speeds I'm getting oscillations, the controller ramps up the power to 4KW then drops off to 1KW and repeats every 3 seconds.
Maybe this controller doesn't match my motor very well, the controller doesn't get very warm even when climbing a long steep hill (7KW continuous), but the motor gets quite hot.

 

[flexy]

It seems to manage current in a different way to the infineon controllers, it maybe acts on some feedback from the current and speed.

If I am going along at a a steady 20mph drawing 3KW, it will allow a sudden acceleration, but from a stop, it is very slow to accelerate.

This is after modifying the shunt with three extra pieces of shunt wire, it is still only drawing 100A max but it's hill climbing ability is much better.

 

[flexy]

I have now tested it with zombiess throttle tamer, this has been a weird experience, the throttle tamer works great with my Lyen 18 fet.
But with the Greentime 36fet it's a different story, It can't seem to let the controller get to max speed (45mph rather than 50 freewheel).

When trying to ride the bike, the speed would oscillate and then cut out, I would have to restart the controller for it to work again.

I think the Greentime must have a similar circuit built in, hence the slow current ramp I get with my scooter, this must cause some conflict with the throttle tamer.

 

[lionschasing]

tell me more please...have you got it working yet? i've got the same issue

I have now tested it with zombiess throttle tamer, this has been a weird experience, the throttle tamer works great with my Lyen 18 fet.
But with the Greentime 36fet it's a different story, It can't seem to let the controller get to max speed (45mph rather than 50 freewheel).

When trying to ride the bike, the speed would oscillate and then cut out, I would have to restart the controller for it to work again.

I think the Greentime must have a similar circuit built in, hence the slow current ramp I get with my scooter, this must cause some conflict with the throttle tamer.

 

[flexy]

tell me more please...have you got it working yet? i've got the same issue

That's interesting, I haven't been able to test it further. I can't get any response from Leo . I would suggest if anyone is ordering one of these they request instant start, then you aren't stuck with the current ramp.

Maybe we need a checklist for anyone ordering from him so they don't miss anything important.

I think I am going to replace mine with a Lyen 24FET.

 

[lionschasing]

I think, a word of advice for anybody buying 36 fets that are made by greentime:

1) order the soft start, it's a lot of fun not to fall off / sit on a jerky instant-start ride only if you definitely dont want to buy zombiess throttle tamer
2) order the hard start, fall off, buy the zombiess tamer
3) ask him to install a POTENTIOMETER that regulates the acceleration and throttle buffer and save yourself the trouble

tell me more please...have you got it working yet? i've got the same issue

That's interesting, I haven't been able to test it further. I can't get any response from Leo . I would suggest if anyone is ordering one of these they request instant start, then you aren't stuck with the current ramp.

Maybe we need a checklist for anyone ordering from him so they don't miss anything important.

I think I am going to replace mine with a Lyen 24FET.

 

[flexy]

I think, a word of advice for anybody buying 36 fets that are made by greentime:

1) order the soft start, it's a lot of fun not to fall off / sit on a jerky instant-start ride only if you definitely dont want to buy zombiess throttle tamer
2) order the hard start, fall off, buy the zombiess tamer
3) ask him to install a POTENTIOMETER that regulates the acceleration and throttle buffer and save yourself the trouble

That's a good start, if it's possible

4) specify wether your current limit is battery or phase (this maybe why my 200A spec controller tops out at 100A)
5) stick to motors and wheel diameters that are known to work well with this controller.


Are you getting 200A battery current without any shunt modification?

 

[lionschasing]

Yes. I have measured200A before shunt mod. after shunt mod battery A was400A.

I think, a word of advice for anybody buying 36 fets that are made by greentime:

1) order the soft start, it's a lot of fun not to fall off / sit on a jerky instant-start ride only if you definitely dont want to buy zombiess throttle tamer
2) order the hard start, fall off, buy the zombiess tamer
3) ask him to install a POTENTIOMETER that regulates the acceleration and throttle buffer and save yourself the trouble

That's a good start, if it's possible

4) specify wether your current limit is battery or phase (this maybe why my 200A spec controller tops out at 100A)
5) stick to motors and wheel diameters that are known to work well with this controller.


Are you getting 200A battery current without any shunt modification?

 

[crossbreak]

I ordered my 24Fet with "fast throttle response" it still has a very soft start

It's simple to tame the throttle behavior. It's IMPOSSIBLE to do it the other way around :x What exactly must I order to get a really hard startup? I use the 24Fet in sensorless mode. Ordered a 15Fet sensorless without any special requirements, it has much better startup acceleration than the 24Fet.

Also what confuses me A LOT is the throttle behavior. I can not call this a "throttle" it's more a speed-limit-setting-switch: If I set 10% throttle for example, the motor draws 1amp and turns with 10kph. If I now go down a slight hill with 12kph it pulls NO CURRENT even if I pull the throttle to 10%!?! Above 50kph, (it runs 105kph no load), I have almost no throttle control. I can almost only go full-torque or no-torque. That's really annoying I just want a current/torque throttle. Is there any controller out there which has torque/current throttle besides the Kellys?

The speed-throttle does not work together well with the CA V3, guess it only works right with a current throttle? Or am I just an idiot not able to properly setup the CA V3 PID controller?

 

[flexy]

Maybe this 36fet was designed to work with a specific scooter/motorcycle motor, we are all using it in very different setups.
I have the same problem with maintaining a constant speed around 45kph, it will continuously accelerate, then coast, then accelerate.

I do have a couple of extra shunt wires added just to get up the steep hills. If the current ramp is part of the programming then we have to live with it, but if it is part of the circuit on the board maybe we could bypass it....?