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Old 04-01-2015, 09:07 AM   #1
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Electrical Geeks HELP... MH Wine Rack

I'm in the planning stages of replacing our booth with a dinette. On the slide side there will be a 12" serving shelf with a enclosed wine rack that will raise up and down from under the shelf. The rack will be raised by a linear actuator and the actuator will be connected to a adjustable timer switch module, all 12 volt. What I need is a way to reverse the polarity of the actuator so it will either retract or extend. HELP... Or if you have a better way of controlling the actuator. I have thought of using a cut off switch at top and bottom that would reverse polarity when the actuator reaches the top or bottom. Suggestions: with diagrams, drawings, parts listings would be helpful and greatfuly appreciated. Somewhat ok in electrical, better in mechanical lol. Thanks Terry
Items found so far and reasonable on amazon.

http://www.amazon.com/Inch-Linear-Ac...rhf_dp_p_img_3

Amazon.com : PowerArt DC 12V Delay Timer Switch Adjustable Module 0 to 10 Second NE555 Electrical New : Automotive Electronic Security Products : Electronics
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Old 04-01-2015, 10:16 AM   #2
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What you need is a 12 Volt Reversing Continuous Duty Solenoid Relay. Look it up on Amazon. Anything above your 4.6A current rating. There will be a schematic with it but it's really simple to hook up. Then just a simple momentary on/off/on rocker switch. Now, if you want it to "automatically" switch to reverse cycle, you'll need some micro switches on the assembly to let the circuit know when it is extended. The problem there is that if it is extended part way, your system won't know if it is up or down.
I make seat actuation systems for first class airplanes. We have the same issue with sensing.
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Old 04-01-2015, 01:20 PM   #3
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Almost any linear actuator will be a three wire setup, no 'reversing' will be required.

You will have (just to explain simply) wires A, B and C. You ground wire A, then when you put 12 volts (I.E. the positive) to B it will extend, to C it retracts.

All you need is a momentary contact switch with a fore-aft motion, center being off. Depending on which side you rock the switch it either extends or retracts. If you mount the switch on a vertical surface then up is up, down is down.

Easy peasy.
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Old 04-01-2015, 08:23 PM   #4
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I bought something like this to install on my rear bed to help lift it.

16" Linear Actuator Wireless Remote Stroke Heavy Duty 330 Pound Max Lift 12V DC | eBay

I had to improvise a attachment so that it mounted next to the existing ram. Works pretty good, now my wife doesn't have to have me lift the bed every time she needs to get something.
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Old 04-01-2015, 09:08 PM   #5
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here's one with upper and lower limits...

2- Momentary Pushbuttons (normally open)
2- 4 poles double throw relays (rated for actuator size)
2- Limit Switches (normally closed)

Notice the different polarities on bottom half of the circuit.

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Old 04-04-2015, 10:56 AM   #6
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This is great.. Now I have lots of options.... I'll post the project on here when done. Thanks Terry
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Old 04-04-2015, 11:38 PM   #7
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You can call local tv places and see if you can find someone who did the large dishes that may hsve a jack or google dish actuator.

They are 24 volt but will work on 12 ( we have bobcat 825 and use one for the rop lift...slow but works).

They have built in limit switches as well as pulse output for digital control.

Using a relay for current control via limit switch and either toggle or relay control you can have simple control with zero active components and many hundred pounds in capacity and 18 to 30 inches lift depending on unit.

Other option is a trailer tongue electric jack as they are 12 volt.
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Old 04-04-2015, 11:51 PM   #8
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Just for future reference, reversing polarity spdt 2 relay setup diagram. Most common use reverse polarity door lock actuators. Works with and DC 2 wire motor.
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Old 04-05-2015, 10:54 AM   #9
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Add to old car nut and your op...

Look at the drawing and locate the coil wire for each relay.

Next add a normally closed switch at each extreme of travel.

Break the connection for each relay and route it through the limit switch for the direction of travel.

That will disable the relay for that direction when it gets there but allows opposite to work fine.

Added suggestions for above.
1. Motor does not stop instantly so make switches location adjustable for fine tuning.
2. All devices will have some play and you will want to demonstrate your work so a not rock solid feel may not be there but makes great difference...so look at using a wedge or other confining shape at each end of stroke with rubber cushions made from shock mounts or other compressable rubber.

The lift drives into the wedge (hidden from view just under counter but on all 4 sides) and touches the rubber cushions.

The switch is activated stopping the motor that now coasts to a stop compressing the pads.

The wedge could be the fit of the bottom of the case and the hole it comes up through.

3. Control. Simple push button, open and close. Either get relays with one more set of contacts to allow for latching or add another relay to do so but be sure to include the limit switch.

Tap button and relay latches allowing automatic rise and stop.

4. Single button control. By adding a set of contacts or clever wiring of single set the limit switches can "control" the control line.

A single button is wired so depending on where the device is it automatically knows which way.

If closed it is connected to open...

Single button push and it goes to opposite position and stops all automatically.

5. Sound...some may want zero noise while others may want sound and that is personnal choice.

If device is noisy make then fashion the workings to make noise sound like true engineering and not a shoe in the dryer.

6. Service add switches somewhere that directly control things so you can make it work if a relay fails or be sure to place controller where you can get to it when everthing is closed as well as having access to the actuator connection to your lift as it may fail and you will need to service it.

7. Parts if you are using "things found" for actuator or other parts or they are not common parts but price is good buy spares now as yours will never fail if you have a spare and certianly will if spare hard to find.

Last is photos!
We want to see it
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Old 04-05-2015, 09:30 PM   #10
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I'll be sure to take pic's along the build and post them here. Again, thanks for all the info it will be used....
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