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MB-1-E Part Fifteen: Controller Upgrade
Submitted by MB-1-E on Fri, 06/08/2007 - 14:48
For those of you who have been following my Mountain Bike build, I have decided to upgrade to an Alltrax controller for my Scott 3/4hp motor.
Although not listed on the Alltrax site, they do manufacture an Alltrax model AXE4824, Programmable, 24-48V, 200A Controller.
I found this one at http://www.electricvehiclesusa.com/product_p/co-axe4824.htm
Jeff Lindsey there was very helpful and let me upgrade from the Navitas to the Alltrax.
I had to spend a bit more, as I expected, but don't think I'll have any more controller problems.
The footprint is the same size as the Curtis 1204, so I'll need to find room on the bike for it.
I ordered a 150A, in-line, Mega fuse (and spare) to put between the battery and the controller. These are slow-blow type so they will handle some initial surge but should be about right to protect the controller.
I also ordered a USB to 9 pin RS-232 cable so I'll have the ability to program the Min/ Max voltages, ramp-up throttle speed and Maximum current output.
I would have purchased a 200A NPX if they had one but they only seem to make the 200A size in the AXE type.
TIMING BELT vs RATIO:
Yesterday I received my 5mm pitch by 15mm wide belt and pulleys. I got a 16T drive pulley and a 62T driven.
There is no way the 16T is going to stand being bored to 5/8" diameter so I went ahead and ordered a 20T instead. Even this will be close but I think a good machinist will be able to bore it out for me.
I will probably do as Eric Peltzer did and use a 1/8" roll pin to secure it. Sure wish I had a lathe to bore these out.
The belt sure seems small compared to my V-belt setup, but I guess synchronous belts are actually stronger than they first appear.
I can use the belt that I originally ordered since I have some room for adjustment of the shaft On-Center distance.
My reduction ratio will be comprimised to a degree but it will end up around 10.5:1 which may work fine with the higher amp controller.
I can always swap back to my current V-belt as an option if I want a 12:1 ratio.
I plan on swapping out my 60T rear chain sprocket with a 72T one that I have, but may try the current configuration first.
Well, I'm back to waiting for parts again ...
Until next time ...