hotponyshoes
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- Somerset. Uk
I have a couple of trim tabs on a boat, these are hydraulic.
There is one ram on each side of the boat and one single pump for both.
There are 2x on/off/on switches on the dash for control. (on posotions are momentary)
The pump motor has a perment ground and 2x live wires. Putting power to either of the live wires makes it rotate either forward or reverse to push or pull the ram(s)
I have wired the switches as shown below, pressing a switch drives the pump in either forward or reverse and also opens a solonide valve for whichever side I have pressed so only that side operates.
There is a prv on the pump so no harm is done if the switches are held down at the end of the rams travel and I have also fitted an interrupt relay to stop it bolwing the fuse if both switches are pressed in opposite directions at the same time.
All of this is working as intended.
What i would like to do is to add some sort of controller to automatically retract both of the rams when not in use.
The +12v feed to the switch above is permanent. I have an inigition switched +12v available from the engine key switch.
I basically need to feed +12v to the SOL#1 & SOL#2 & PUMP REV wires for a period of about 30seconds after the engine is switched off.
To complicate things further I would also like to either:
A: add a delay BEFORE the pump starts running, so if i try cranking the engine and it wont start, or I just turn the key on and off quickly to see how much fuel I have etc the pump won't be running after that
B: Prevent it from running the pump if I have not used the trim tabs since it retracted them last time
B would be the preferred option.
So far I can work out option A by using a couple of delay timers and a relay.
Option B I have kind of worked out using a couple of latching relays, about half a dozen normal relays and a timer
For either option I think I need a couple of diodes for each solonide wire as well.
Is there a simple way of doing this that I have not thought of yet? An off-the-sheld solution for sensible money?
Power requirements are 20a at 12vDC and it needs to be waterproof/shockproof so something i can put in a box and fill with potting compound afterwards.
There is one ram on each side of the boat and one single pump for both.
There are 2x on/off/on switches on the dash for control. (on posotions are momentary)
The pump motor has a perment ground and 2x live wires. Putting power to either of the live wires makes it rotate either forward or reverse to push or pull the ram(s)
I have wired the switches as shown below, pressing a switch drives the pump in either forward or reverse and also opens a solonide valve for whichever side I have pressed so only that side operates.
There is a prv on the pump so no harm is done if the switches are held down at the end of the rams travel and I have also fitted an interrupt relay to stop it bolwing the fuse if both switches are pressed in opposite directions at the same time.
All of this is working as intended.
What i would like to do is to add some sort of controller to automatically retract both of the rams when not in use.
The +12v feed to the switch above is permanent. I have an inigition switched +12v available from the engine key switch.
I basically need to feed +12v to the SOL#1 & SOL#2 & PUMP REV wires for a period of about 30seconds after the engine is switched off.
To complicate things further I would also like to either:
A: add a delay BEFORE the pump starts running, so if i try cranking the engine and it wont start, or I just turn the key on and off quickly to see how much fuel I have etc the pump won't be running after that
B: Prevent it from running the pump if I have not used the trim tabs since it retracted them last time
B would be the preferred option.
So far I can work out option A by using a couple of delay timers and a relay.
Option B I have kind of worked out using a couple of latching relays, about half a dozen normal relays and a timer
For either option I think I need a couple of diodes for each solonide wire as well.
Is there a simple way of doing this that I have not thought of yet? An off-the-sheld solution for sensible money?
Power requirements are 20a at 12vDC and it needs to be waterproof/shockproof so something i can put in a box and fill with potting compound afterwards.