Bill,
Quick question on your throttle control setup. Using a Morse throttle cable to control the Sevcon throttle; how do you achieve a throttle "lock" in neutral to prevent the electric motor from powering up if someone accidentally bumps the throttle lever, or a line should snag on it and power it up? That would be a serious concern for me.
Thanks,
Martin
On Wednesday, November 15, 2017 8:20 AM, king_of_neworleans <no_reply@yahoogroups.com> wrote:
Hi Bill. My setup is brushless, and my controller is one of the new sine wave controllers from Kelly, and it was flashed with their "stick shift" firmware upgrade. They can put that on their square wave controllers, too. Without the upgrade, which is free now, you need a separate throttle and FWD/REV switch. With the stick shift upgrade, you can use a 5k or 10k (resistance is not critical) potentiometer for both speed and rotational direction. I am using an ordinary $1 pot from Radio Shack, fiberglassed into a sleeve that fits on the end of my tiller. Center position is stop. If I turn it CW it is in FWD rotation, and turning it further increases speed. If I set it CCW from the center position, it is in REV and turning it further increases speed. Simple and cheap. A three wire cable connects the pot to the controller. The pot simply functions as a variable voltage divider for the 0-5v supply and the center tap is the signal, The sig level represents one of 128 discrete levels and the controller then sets the rotation and speed according to that, so it is stepped, but it is in such small steps that it is not noticed. You can set the amount of dead space in the center to whatever you want, as well as the high and low setting and dead space at either end of the knob's travel. You could also install a local/remote switch and have a local control in or next to your engine compartment, for troubleshooting.
My pot is not weatherproof. When not in use I lash the tiller up and turn a beer glass over the end. While underway if it rains I just tape a zip lock bag over the end of the tiller. I keep a spare, anyway.
Of course you could implement this feature with any controller, using an external microcontroller, or using the boat's original controls and microswitches and a relay for fwd and reverse, and a radial arm instead of a knob on the pot, for attaching the original throttle cable. More than one way to skin a cat. Possibly someone has a stick shift throttle unit that gives you a single hand lever like a ship's Engine Order Telegraph, that then interfaces with the controller to give both speed and directional control. Certainly, it can be done, either mechanically or with logic.
Hope that at least gives you some ideas. More than one way to skin this cat.
My pot is not weatherproof. When not in use I lash the tiller up and turn a beer glass over the end. While underway if it rains I just tape a zip lock bag over the end of the tiller. I keep a spare, anyway.
Of course you could implement this feature with any controller, using an external microcontroller, or using the boat's original controls and microswitches and a relay for fwd and reverse, and a radial arm instead of a knob on the pot, for attaching the original throttle cable. More than one way to skin a cat. Possibly someone has a stick shift throttle unit that gives you a single hand lever like a ship's Engine Order Telegraph, that then interfaces with the controller to give both speed and directional control. Certainly, it can be done, either mechanically or with logic.
Hope that at least gives you some ideas. More than one way to skin this cat.
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Posted by: Marty Tryon <exstig@yahoo.com>
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