SOLVED! Infineon Cutting out Question

[mdd0127]

I think that my cutting out issue was either I got a turd fet or the motor was actually shorting out. I got the bike back together with my other 12-fet tonight and it stomps.....33mph in 5-6 seconds on a half dead 44v 10ah pack! It will put out more power than I can keep on the ground if I tighten the clutch enough and nothing's getting too hot. Whatever I did fixed it???!!!

Now I just have to monsterfy this controller's board and wiring and bump up the voltage and 50mph should be easy! I can't wait to see what the HV160 does!

[def215]

hi guys,

im having trouble with this cut out problem also. i have a 6fet ebay controller running an rc motor fitted with halls. before i was able to get it to run up to 1/4 throttle then cut out after that. i tried the shunt mod, and now the motor just makes a click sound whenever i turn the throttle. i tried to unsolder the shunt to make it stock to see if it will work but it just makes the click sound also. did anyone else have this issue too? doe anyone know if i killed the controller?

[mdd0127]

They are pieces of crap. Quit spending your money on them. Mine just keep cutting out and failing/blowing fets, for no apparent reason. Bad design, built by people that don't care. Get a horse.

[gwhy!]

The through hole connections are rubbish at the gate of the parralled fets and if one of the gate connections on any set of fets it will blow it at around 10+20amps and this is another reason that can make these stacked fet controllers unreliable.I think this is more of a problem if the original fets have been replaced.

[mdd0127]

The through hole connections are rubbish at the gate of the parralled fets and if one of the gate connections on any set of fets it will blow it at around 10+20amps and this is another reason that can make these stacked fet controllers unreliable.I think this is more of a problem if the original fets have been replaced.

That's funny. It was mainly your ranting and raving about how bomb proof they are that convinced me to start buying them. I upgraded the upper traces and through hole connections on one and it blows up randomly too. It's also always the blue phase that goes first. Something's wrong with the board design when upgraded fets are used and more than 60 amps is going through them. For now, they're a fine option for running a hub motor at sub 40A levels and that's it. Definitely not worth modding though and NO WAY are they reliably capable of 100A as you and Lyen have claimed in the past. Just so everyone else knows..........

[gwhy!]

The through hole connections are rubbish at the gate of the parralled fets and if one of the gate connections on any set of fets it will blow it at around 10+20amps and this is another reason that can make these stacked fet controllers unreliable.I think this is more of a problem if the original fets have been replaced.

That's funny. It was mainly your ranting and raving about how bomb proof they are that convinced me to start buying them. I upgraded the upper traces and through hole connections on one and it blows up randomly too. It's also always the blue phase that goes first. Something's wrong with the board design when upgraded fets are used and more than 60 amps is going through them. For now, they're a fine option for running a hub motor at sub 40A levels and that's it. Definitely not worth modding though and NO WAY are they reliably capable of 100A as you and Lyen have claimed in the past. Just so everyone else knows..........

I have never raved over the 12,18,24 fet controllers only the 6 fet controller are worth having , but on a side note I do have a modded 12fet that I have push 140A through but I wouldn't not trust it to work very long at this current, I run it at 80A which is the same current that I run my 6fet controllers on but the 12fet still gets hotter than the 6fet at this current.

[Thud]

I get em pretty hot just running 60 amp through them using irfb3077's

we are deep into the realm of "reasonable expectations" regarding motor temp jambing that many amps for too long anyway. I really think we do more harm posting peak amp draws...the sustainable power range is where we live any way.

Look at the smoked astro's at the willow springs race. I have smoked plenty of stock 80mm outrunner motors running them at 4kw for too long. sure they'l take a punch of 100 amps for 6 seconds & not flinch....punch em 15 times every 2 minutes for 15 minutes & they cook like cheap meat on a grill.

[kZs0lt]

I'm experiencing cutouts as well with my 6Fet and 12Fet controllers fitted with 4110 FETs. I'm using 9C 9x7 motor.
The 6FET controller works fine with 20A battery, but set to 40A battery/100A Phase it cuts out.
The 12 FET controller I have set to 57A battery (max in Parameter designer) on the 9FET setting and it also cuts out with max throttle from a dead stop.
The shunts are about 5mOhm on the 6 FET, and about 2.5mOhm on the 12 FET. What are the shunt resistances stock on the 6 and 12 FETs?

Could someone summarize all the info gained in this cut-out problem?

2. What is the cause of the cut-out?
-Too high battery or too high phase current?
-Or the voltage on the shunt is too high?
-Could be caused by the QF1 transistor activating?

2. What are the solutions to fix the cut-out problems?
- program the board with a higher FET number -> In my opinion this alone should not make any difference, as it will cut out at the same power level
- lower the shunt resistance -> maybe this could help?
- remove QF1? -> some reported controller failure for this
- alter QF1 circuit(resistor across c20, etc) - someone reported that the cut-out was clearly not caused by this as it was experiencing it even with QF1 removed

[gwhy!]

I'm experiencing cutouts as well with my 6Fet and 12Fet controllers fitted with 4110 FETs. I'm using 9C 9x7 motor.
The 6FET controller works fine with 20A battery, but set to 40A battery/100A Phase it cuts out.
The 12 FET controller I have set to 57A battery (max in Parameter designer) on the 9FET setting and it also cuts out with max throttle from a dead stop.
The shunts are about 5mOhm on the 6 FET, and about 2.5mOhm on the 12 FET. What are the shunt resistances stock on the 6 and 12 FETs?

Could someone summarize all the info gained in this cut-out problem?

2. What is the cause of the cut-out?
-Too high battery or too high phase current?
-Or the voltage on the shunt is too high?
-Could be caused by the QF1 transistor activating?

2. What are the solutions to fix the cut-out problems?
- program the board with a higher FET number -> In my opinion this alone should not make any difference, as it will cut out at the same power level
- lower the shunt resistance -> maybe this could help?
- remove QF1? -> some reported controller failure for this
- alter QF1 circuit(resistor across c20, etc) - someone reported that the cut-out was clearly not caused by this as it was experiencing it even with QF1 removed

If it is the problem that was resolved, this was due to the time constant circuit ( QF1 and c20 ) on the hard cutoff of the controller ( a extra safety feature built in to the controller ) basically the battery current needs to reduce at a rate that the controller is happy with. Removing QF1 Is not such a good idea as this will disable the feature all together, The resistor across c20 increases the time constant of the circuit and may still cut out at even higher extreems ( this works but can be a bit of a pain to fit the resistor), so the controller fets will still have some sort of protection. Re-programming with a higher fet count works because the timed window on the pin that the RC circuit goes to is increased for the more powerfull controllers but you will also have to adjust the shunt value (lower) to the same value in the bigger controller i.e a standard 6fet will need 2 shunts instead of 1 if programming as a 12fet.