Well I'm stumped.
I acquired a beautiful Robbe U47 running the Rokraft 8367 ESC. It has worked fine for years, but has just recently started playing up.
There are two big batteries for powering the twin motors, and a smaller, separate RX battery for powering the receiver (I was always puzzled as to why they did it that way in this age of BEC). It's also wired through what appears to be a relay. Is that what it is? I mean the blue thing next to the ESC - see picture.What is that?
So here's the problem:
- The motors only turn on a fraction of throttle, in both forwards and reverse. Full throttle and they stop.
- I've re-calibrated the ESC several times, but still the same problem
- The batteries are all healthy - they all cycled up to capacity
- I got a 30 amp mtroniks marine ESC, and tried connecting it up in the same way as the existing set-up: Still incorporating the RX battery, still going via the relay (if that's what it is). Everything worked and the ESC responded to the transmitter, but the motors wouldn't turn over
- I then tried a more modern, standard, simplified set-up: No relay, no RX battery, just connecting the Mtroniks ESC directly to the motor batteries. Again, everything worked and the ESC responded to the transmitter, but the motors wouldn't turn over
Therefore, I'm stumped! I've put everything back to how it was and have started looking for another Rokraft 8367 ESC, but they're bloody expensive for what they are.
Many thanks in advance, really hope to hear from someone!