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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: Dreamscape on September 23, 2011, 07:40:56 AM
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Doug bought a couple of these yesterday and we can't figure out how it's wired for in and out direction. I did a search and came up blank. With two wires coming out, one black, one red and two studs. Is one stud a ground? How do you wire it for forward and reverse?
(http://i363.photobucket.com/albums/oo78/Dreamscape_Eagle/2011-09-23_07-42-54_318.jpg)
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Paul, it is in the switch it reveres the current ask Doug how many he needs I have some HWH F/R switches in a panel with the off and on and locks also George gave me a few years ago,if memory serves me red wire is out and black is in nether wire is grounded
good luck
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RUT RO! Paul you slide plans in your near future?
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That is a permanent magnet motor and it is reversed by reversing polarity, much like a power window in a car.
You can use a DPDT Center Off switch, preferably spring loaded in both directions to control it. A power window switch should work as well.
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[Len beat me to it, but I'll post this anyway]
The type of switch you want is a 'double pole, double throw' type (six contacts) I had to wire one up some time ago for a project I built (a mechanism to move an LCD screen up and down). It took me ages to figure out how to wire the switch up, but my brain was probably being slow that day.
BTW - it's hard to judge the size of that slide mechanism in your photo - is it from a room-extension slide, or something smaller? If it is from a room-extension slide then I have really over-engineered mine.
Jeremy
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Paul, it'll never work, you don't have any Dilithium Crystals for it to reverse with. Send it to me and I'll be happy to dispose of it for you at just a small nominal charge.
No thanks needed, glad to do it for a friend!
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This is not mine, and it's not for slides. Doug has other plans for their use. ::)
The unit is about 36" long. We are assuming they were for slides.
I'll let Doug know to check in on this thread and he can decide how to decipher the information.
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Other than a slide the only reasons I can figure you should use one would be for a switch operated slide out with a beer cooler or a BBQ pit. Huh? What was I thinking? A combination beer cooler/BBQ pit system. ;D
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They are nice to have on a generator and the rear bed those look like 24 inch under the floor slides
good luck
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Clifford, You guessed correct on both applications! 8)
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That setup does not appear to have limit switches, which I would consider adding so that the motor cannot be powered up against a stall condition (unless they are built in already).
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The limit switch is built into the motors Len
good luck
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Thanks all for helping me understand what we are dealing with. I think I'm closer to understanding how it works. I just need to wrap my head around the diagram below. The motor is not grounded, each wire lead feeds the direction of the motor, forward or reverse. Does the motor have two separate sets of magnets for direction? What am I missing? The motor will not work without this relay?
(http://i363.photobucket.com/albums/oo78/Dreamscape_Eagle/24450_pm.gif)
It was taken from this site.
http://texasindustrialelectric.com/relays_24450.asp (http://texasindustrialelectric.com/relays_24450.asp)
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Why do you think that the motor won't work without that relay - has the motor manufacturer said that? If not, it just looks like an alternative (better for higher currents) way of reversing the polarity than doing it at the switch.
Regarding the ground - on DC components, ground is used as a common negative* connection for everything - which you can't have if you want to be able to reverse the polarity to one component. The motor doesn't need to have two sets of magnets (or field coils), one for each direction - as with any normal DC motor, if the polarity to the armature windings is reversed the motor will turn the other way.
Now a question from me:- if the limit switches are 'inside the motor', are there proper (and adjustable?) mechanical switches in there? There might be, but if they're inside the motor I'm not sure how these would be arranged to detect the limits of travel of the external ballscrew. Alternatively, is it possible that the built-in 'limit switches' are actually stall-sensing circuit somewhere - possibly inside the motor or maybe part of the original wiring harness or switch? I might be very tempted to adapt this slide mechanism into whatever device (generator slide etc) that I'm building, then, once I knew exactly where I wanted the 'in' and 'out' positions to be, fit my own brackets and limit switches in the appropriate places
Jeremy
*might be positive if the vehicle is from medieval times
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Jeremy, The reason I say that about the relay is this. We tried it from a charged 12v battery and could not get it to move at all. I know nothing about this permanent magnet motor, therefore the questions.
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when you hooked it up no hum or anything?(in a bind) The two wire slide motors I use you just basically reverse the wire polarity to change direction. Might try manual moving shaft incase there is a little corrision causing poor elect contact inside motor. Or pull end plate and make sure brushes are clean. Some of those had a manual lever on end(didn't appear in picture) that was a disconnect switch. Bob
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How did you wire it up. The ground (frame) is not connected to anything in this motor. You just connect the battery to the two wires. To reverse, you reverse the connections. It's not one wire for forward and the other for reverse.
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just switch the wires. forget about any other grounding. It works! Is working on my slide motors now.
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The only idea I have to add to that would be to check the brushes in the motor, if they are of the serviceable / replaceable sort (but probably not, from what I can see in the photo). The motor might simply be dead, but there isn't really much to fail in a simple DC motor unless it's been burnt out through abuse (run on the wrong voltage, or overheated by being overloaded or stalled).
So I'm wondering again about the wiring - everything suggests that it is a simple two-wire hook up, but it might be something different. We'd need a better photo of the end of the motor to determine that. The only other alternative - assuming the motor isn't dead - is that the 'internal' limit switches are cutting off the power, but that presumably shouldn't be the case when the ballscrew mechanism clearly isn't at either end of it's travel.
Jeremy
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Bob is telling you how they work hook a ground to one wire a positive to the other it will go in that direction reverse the 2 wires it will go in the other unless the motors are stuck or bad, so you know the studs are for when you use 2 slides on 1 room for wiring to the other slide motor so 1 switch controls both then they are in sync
good luck
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Test was a success. The motor does not stop at the end of the stroke, so we'll just wire a limit switch on both ends of the travel to break the current.
Thanks for the help guys!