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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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linear actuator
Long time since I've posted but I need some help.
I have a HTS (Houston Tracking System) linear actuator off of a C-ban satallite dish. It has 6 wires coming out of it; 2 large (~16 ga.) [red and white] and 4 smaller wires [od green, green, yellow and bare] I'm pretty sure that the red and white are the power leads and the others are sensor wires. I also think that it is 24 volts dc, here is where I have been having problems; I can get the actuator to move in only one direction no matter which wires I use for positive and negitive. Is there a couple of the other wires that need to be dealt with in order to make this motor turn in the oppsite direction? Any help would be appreciated. Mike |
#2
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linear actuator
so if you make the red plus and the white minus, it moves? and if you make
the red minus and the white plus it still moves in the same direction? tell us exactly what you did, maybe we can help - your guess that the two larger wires are power is good - sometimes the ground is part of the circuit (e.g. red to ground or white to ground) "mike" wrote in message ... Long time since I've posted but I need some help. I have a HTS (Houston Tracking System) linear actuator off of a C-ban satallite dish. It has 6 wires coming out of it; 2 large (~16 ga.) [red and white] and 4 smaller wires [od green, green, yellow and bare] I'm pretty sure that the red and white are the power leads and the others are sensor wires. I also think that it is 24 volts dc, here is where I have been having problems; I can get the actuator to move in only one direction no matter which wires I use for positive and negitive. Is there a couple of the other wires that need to be dealt with in order to make this motor turn in the oppsite direction? Any help would be appreciated. Mike |
#3
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linear actuator
On Oct 20, 5:34*am, mike wrote:
Long time since I've posted but I need some help. Any help would be appreciated. Mike I would measure the resistance between all the leads. The big leads are most likely the power leads, but the smaller wires might go to relays that control the speed and direction. Dan |
#4
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linear actuator
I've had a few of the C-band dish actuators apart, and the leads going into
the gearbox were for DC motor power, and a feedback device which may be either a potentiometer or a reed switch assembly that's aactivated/switched by a rotating magnet disc. If you remove the gearbox cover, the wiring should be fairly obvious. The older actutors that I'm familiar with (1980s models) had an indoor power supply (separate from the tuner) that was the power source for the motor, and also had the reversing relays in it. The feedback leads went to the tuner IIRC. It's not entirely clear, what you described as the actutor only moves in one direction regardless of the DC polarity change. I think you are seeing that with one polarity, the actuator moves, and with the other polarity, it doesn't move (not that it moves in the same direction as the first polarity). Inside the actuator tube there is a ballscrew, and since ballscrews are easily moved by external forces, there needs to be a braking system to insure that the actuator holds it's position. The actuator tube probably isn't designed for disassembly, but there are likely to be a pair of spring coil mechanical brakes wound to fit snuggly onto hubs. The ones I saw (when I used an angle grinder to disassemble the actuator), were the type of brakes that hold a hub in the way that turning a rod inserted into a spring will turn freely in one direction, but be gripped by the spring in the other direction. If water has gotten into the actuator and caused the spring coils to rust, they aren't likely to be operating as intended. -- WB .......... metalworking projects www.kwagmire.com/metal_proj.html "mike" wrote in message ... Long time since I've posted but I need some help. I have a HTS (Houston Tracking System) linear actuator off of a C-ban satallite dish. It has 6 wires coming out of it; 2 large (~16 ga.) [red and white] and 4 smaller wires [od green, green, yellow and bare] I'm pretty sure that the red and white are the power leads and the others are sensor wires. I also think that it is 24 volts dc, here is where I have been having problems; I can get the actuator to move in only one direction no matter which wires I use for positive and negitive. Is there a couple of the other wires that need to be dealt with in order to make this motor turn in the oppsite direction? Any help would be appreciated. Mike |
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