Vairiable resistor across shunt resistors to change amps

[robwilde]

could this be possible ??

i want to do the mod on the headline control unit by adding a 30 milli ohm rssistor , could it be possible to get a vairiable resistor that could be between 50-20 milli ohms then mount it externally and be able to turn a knob from 20 milli ohm resistance to 50 depending on how much power you wanted to draw .

it was just a thought if im stupid and its not possible jst tell me and ill shut up ...

it just seems it could be possible seeing as the cycle anyalist can alter stuff like that !!

all reply are welcome and any good suggestions accepted for me to test

 

[heathyoung]

Too hard to do that way, but if you made a variable resistor to adjust the gain of the shunt input amplifier, this is doable.

 

[kiwi_luke]

I would also like to modify my 250W cyclone/headline motor to 360W by modifying the internal control unit. Not being an engineer, does anyone have a simple/idiots guide on how to do this?

 

[ZOMGVTEK]

The way the shunts in the controllers work, is all the power for the controller passes through it. So if youre running 4kw through it, you better have one precision rated resistor at a high power rating as well. This isnt signal level were dealing with here, like the cycle analyst sees.

Basically youre not going to find a pot sensitive enough to handle the task. Nobody really make precision pots that handle power, and are in the miliohm range. Plus, this would have to be soldered to the board, if you used any length of wire the wire alone would be over 50miliohms. Its not practical whatsoever.

 

[heathyoung]

I would also like to modify my 250W cyclone/headline motor to 360W by modifying the internal control unit. Not being an engineer, does anyone have a simple/idiots guide on how to do this?

Yep - buy some 0.047 Ohm 3W Vishay resistors and replace the 0.1Ohm ones already on the control board. Easy.

 

[kiwi_luke]

Thanks for that. How many 0.1Ohm resistors are on the control board and where are they located?

 

[kiwi_luke]

PS - Do you have a part number for the resistors? - I cannot find them on their website. Cheers.

 

[kiwi_luke]

I would also like to modify my 250W cyclone/headline motor to 360W by modifying the internal control unit. Not being an engineer, does anyone have a simple/idiots guide on how to do this?

Yep - buy some 0.047 Ohm 3W Vishay resistors and replace the 0.1Ohm ones already on the control board. Easy.

Would the 30W 0.047 Ohm Vishay resistors be OK (I can't find 3W 0.047 Ohm resistors)?