dei 528t for linear actuator

Hello,

I am finishing up my senior design project for my mechanical engineering degree (read mechanical, which means just the very basics in electrical taught to me) at the University of Toledo. For part of the project, we need to power a linear actuator.

As follows, this is the process we want to achieve:

Power turns on, activates the linear actuator, which extends to desired length. Once it reaches this point, it reverses and shuts off.

So far, I have purchased a 12V linear actuator (max rating of 2 amp, so nice low power consumption). I have several Bosch style relays at my disposal (IIRC pins labeled as 30, 85, 86, 86a, 87 with a 30Amp max current rating), and I also have 3 DEI Timer Pulse Relay's at my disposal.

The linear actuator has a built in limit switch that will kill power to the motor once it has fully retracted, so there shouldn't be any need to use a relay to cut off power once it has fully retracted, since it will do it itself.

Also, this will all be used with a 110/120 AC to 12V DC convertor that will be plugged into a wall outlet timer (like those you would use for turning on lights at night if your are out of town). When the desired time comes along on the wall outlet timer, it will allow power to flow through to the AC to DC convertor, and run the cycle.

I only need the actuator to extend and retract once, which is the nice part of the built in limit switch, so I can set the wall outlet timer to run for 30seconds to 1 minute longer than the entire cycle takes, to save power consumption (and to keep my energy bill low!).

If you need anything else, please ask.

Thanks!

Chris

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- Chris
04 Xterra

After your actuator turns itself off, what will reset it to prepare it for the next cycle?

Or if it doesn't have some kind of reset logic, is the wall outlet timer supposed to ony send in a momentary trigger, and it's expected to be off by the time the actuator cycle completes, so it doesn't end up starting another cycle?

Is it strictly the timing of your pulse the thing that determines the desired extended length, or do you have some kind of limit switch for it to know when to reverse and retract?

dualsport wrote:

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After your actuator turns itself off, what will reset it to prepare it for the next cycle?

Or if it doesn't have some kind of reset logic, is the wall outlet timer supposed to ony send in a momentary trigger, and it's expected to be off by the time the actuator cycle completes, so it doesn't end up starting another cycle?

Is it strictly the timing of your pulse the thing that determines the desired extended length, or do you have some kind of limit switch for it to know when to reverse and retract?

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The wall timer itself will turn off after the desired set time. So say the timer only has minute increments, and it takes, say 35 seconds to run the entire cycle, I will set the timer to turn on at 9:30am and turn off at 9:31am. After the wall timer has shut off power, there will be no power to the circuit.

Yes, the timing of the pulse will *hopefully* determine the extended length.

I was actually able to do the same thing with a 24V actuator, an NCC Solid State Timer Relay, a 110 to 24V power supply, and a wall outlet timer (but I had the help of one of the electrical engineering professors, which unfortunately is out of town for the next two weeks for seminars). If it helps any, I can post up the picture of the NCC Timer diagram, along with how it was wired.

In fact, give me about 5 minutes, and I can post the diagram, along with the pictures.

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- Chris
04 Xterra

Ok, so here is a side shot of the 24V relay, so you can get a picture of how the circuit inside of it works. On top of the relay, there is an adjustment knob to turn to set to the desired time.

https://i10.photobucket.com/albums/a109/slick94prix/solidstatetimer.jpg

The linear actuator had two wires, a white and a black.

Here is how we have this circuit wired:

Pin 2 +24V input
Pin 7 -24V input
Jumper on pins 3&5 with + 24V input
Jumper on pins 4&6 with - 24V input
White from actuator to pin 8
Black from actuator to pin 1

And here is the electrical box for the one, completely done and working (the switch on the side is a total kill switch, which the 12V one I need to do now does not need):

https://i10.photobucket.com/albums/a109/slick94prix/IMG_3806.jpg

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- Chris
04 Xterra

Well... got to mess with it for a few minutes today, but not much to post really.

Red- 12V +

Black- 12V-

Gonna tie the BLACK/ white in with the Black, that way when the 528t get's power, the coil is activated.

Now to figure out what to do with yellow, orange, and brown.

I figure I will probably have to use relay's to switch polarity, not sure how I'm going to do this yet.

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- Chris
04 Xterra

Does anyone think that either of these would possibly fit my application?

https://www.the12volt.com/12voltimages/5wap.gif 

After doing a bit of searching, this seems to be like DEI's 451m Door Lock Relay pack, which has a 3 pin harness input (Green, Red, Blue), and then 5 wires on the opposite side of the relay (Green, Blue, White, Brown, and Purple). The only thing I understand out of this is that since the actuator requires 12V+ to extend/retract, that the Purple would need to be connected to 12V+.

https://www.the12volt.com/12voltimages/actuatorrevpol.gif

This just seemed a bit more simple, and didn't require a switch, which seems more correct, because I'm looking for this to be fully automated (power turns on, the actuator extends and then retracts, then power turns off).

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- Chris
04 Xterra

Got it working, here is what was done, just incase anyone was wondering:

528T
Yellow goes to actuator +.
Orange goes to Ground.
Brown goes to +12V source.
Red goes to +12V source.
Black goes to Ground.
BLACK/ White goes to Ground.

SPDT relay
30 goes to actuator -.
87A goes to +12V source.
87 goes to Ground.
86 goes to Ground.
85 goes to yellow (30) from 528T.

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- Chris
04 Xterra