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4 EDF Model Vulcan - motor/speed controller problems
TonyS posted a topic in Gadgets and Electronics
I've been trying to build a 4 EDF model Vulcan for the best part of 5 years now, maybe longer. It took shape quickly but came to a screeching halt when I got to wiring it up and has sat on my workbench ever since. Every so often I pluck up enough enthusiasm to 'give it another go' and so, here I am. Basically the problem is this. No matter how I wire the system I can only ever get two fans to work. The set up was meant to build in some redundancy, one battery powers the two inboard fans, the other the two outboard fans. I did this such that if one battery gave up the model would still have two motors. Anyway, the set-up is as follows: The four speed controllers have four plugs each with a positive, negative and data wire. I have disconnected the orange data from three of these. So the four plugs then go into a 4 in 1 connector which then connects to the throttle port in the receiver. The power cables from the outboard EDF speed controllers (red and black) connect into a 2 into 1 and then into one battery, the inboards do the same into the other battery. I switch on my Tx (a Spectrum DX7) and then connect the two batteries. The two inboard motors then bleep and respond to throttle inputs from the Tx. The outboards EDFs are dead. I've just tried changing the battery set-up so that in place of the 2x 4S batteries I have 2x 2S batteries in series and all 4 of the motors then connect together. I did this in case the problem was connecting first one battery (which then primed 2 speed controllers) then connecting a second but at this stage the second pair of speed controllers wouldn't be recognised. Same outcome - 2 EDFs working, two EDFs dead. If I mess around I can get the 2 outboard EDFs to work and then the two inboard EDFs are dead. If anyone can provide any pointers as to what I could try next I'd be immensely grateful. I did by the way post about this (about 4 or 5 years ago I think though I've lost track of time). Thanks- 44 replies
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