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reverse voltage for boat


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dualsport 
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Posted: June 30, 2007 at 12:53 PM / IP Logged  

When I did the cut and paste when I copied your diagram, forgot to change the name of the third relay from Relay 2 to Relay 3; the bottom relay is the 12V power relay (Relay 3).

The two top relays are the polarity configuration relays (Relay 1 and Relay 2).

The top of the motor is the (+) and the bottom connection is (-), and in the original setup were connected to Input (+) and Input (-) respectively.  

With the use of relays, the two control wires don't need to be heavy gauge or anything, since they're just driving the relay coils, but if they're already run, there's no need to change them.

The 12V power shown should be fused as in HWW's diagram; I didn't draw that in-

dualsport 
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Posted: June 30, 2007 at 1:28 PM / IP Logged  

reverse voltage for boat - Page 2 -- posted image.

Thick lines need to be heavy gauge since they carry power for the motor-

hotwaterwizard 
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Posted: June 30, 2007 at 5:14 PM / IP Logged  

I can not understand how the actuator will go up then stop and then down and stop in your diagram.

What if there are no limit switches?

John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
hotwaterwizard 
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Posted: June 30, 2007 at 5:22 PM / IP Logged  
reverse voltage for boat - Page 2 -- posted image. 
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Installer_mss 
Copper - Posts: 221
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Posted: June 30, 2007 at 5:33 PM / IP Logged  

are there 5 terminals or 3 on the swtich currently being used?

all that needs to be done is wire up the thing like an actuator in a door of a car

Actuators / Reverse Polarity
This is practically identical to the 5 wire alternating 12V(+) system above. The only difference is there's no switch! Both motor legs rest at ground at the relays. To lock or unlock the vehicle, polarity is changed on one motor leg.
 
reverse voltage for boat - Page 2 -- posted image.

"If a man made it, another can modify it...it just takes some thinking."
"If you ask questions, you're a fool for 5 minutes; if you don't, you're a fool for a lifetime."
hotwaterwizard 
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Posted: June 30, 2007 at 5:36 PM / IP Logged  
reverse voltage for boat - Page 2 -- posted image.
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
hotwaterwizard 
Silver - Posts: 1,350
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Posted: June 30, 2007 at 5:40 PM / IP Logged  

We have no Remote and only 2 wires in the dash for switching a low current load.

It is a boat so there is no common ground.

John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
dualsport 
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Posted: June 30, 2007 at 7:40 PM / IP Logged  
hotwaterwizard wrote:

I can not understand how the actuator will go up then stop and then down and stop in your diagram.

What if there are no limit switches?

The limit switch is the guy at the helm operating the switch, which is how he is doing it now. Same as a power window, he'll have to just switch it open or closed, and I assume he can see the hatch as he does it. He didn't mention needing automatic limit switching, though I'm sure it'd be a nice feature.
My take on it was that he's just trying to solve the problem of the slow motor, which was due to the voltage drop across the very long wire run that was carrying the the actual power for the motor.
By using relays right at the hatch motor, he can now run 6" heavy gauge wiring from the battery to the motor, and control it with the two existing wires that is being used now.
If he wants to add more features like limit switching or auto up/down action, it can be done easily enough (actually they were already done in some previous posts), but maybe we ought to see if he's still reading and wants that kind of thing first. Whether it's worth the extra complexity and possible extra failure points is up to him.
Keeping it simple for better reliability-
dualsport 
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Posted: June 30, 2007 at 7:46 PM / IP Logged  
hotwaterwizard wrote:
reverse voltage for boat - Page 2 -- posted image.
That's the way to go, think it's a winnah!reverse voltage for boat - Page 2 -- posted image.
You know, that's actually the same setup you already posted in your second diagram, I guess what threw me was the two separate switches shown in that one. Your latest one with the SPDT switch made me see the light- reverse voltage for boat - Page 2 -- posted image. Good job-
hotwaterwizard 
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Joined: December 11, 2003
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Posted: July 04, 2007 at 3:41 PM / IP Logged  
reverse voltage for boat - Page 2 -- posted image. 
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
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