ATX PSUs have built-in current limiter devices that protect against short circuits. It might not be a power overload per se, but you might nonetheless be triggering the power supply's over-current protection. You might also try a different PSU if you have one handy. There's lots of info on these boards about HBridges & Relays but it's all at a level that's just over my head. I think others are probably in the same boat as me. I can put stuff together with some instruction & a parts list but that's about it. You mention fuses, relays, mosfet drivers - again, you've lost me. I can try fabricating counterweights and attaching to see if that makes a difference but how will I test with the ammeter if the PSU dies instantly every time? I'm a little concerned about continually attaching to my zebsboard for fear of blowing something. I don't have counterweights attached yet - just the motor. I can reset the circuit breaker on the breakout board but always the same results. I tried connecting directly to my PSU using an ATX breakout board. I tried connecting my HC 970 to zebs board - the motor whines but does not spin. The link you provided talks about playfield tv's? Thanks, but I'm afraid you've lost me a bit. This is for the LedWiz rather than Zeb's kit, but the principle is the same: In case the power draw does end up being too high, here's some general information on boosting power from an output controller. It's rated for 4-5A, right? If you rig up your counterweights and measure current draw with this motor, I bet it'll come out to 3-4A. I'm guessing that you actually *can* run this with Zeb's board. If it's not in range, look into a relay or bigger MOSFET driver. If it's in range, go ahead and use it directly, but include a fuse based on the controller's nominal limits so that you don't have any anomalous overloads. Then compare that to what your output controller board can handle. Your HC 970 is an excellent motor for this job, so what I'd do is rig it up with the counterweight you're planning to use, then get out an ammeter and measure its actual current draw under that load. What you really need to know is how it's going to act under the load you're going to use it with. The current draw for a motor depends on the mechanical load, and if you look at any motor's spec, it'll have a ridiculously wide amps range, like 2A - 30A. the published specs for motors aren't really all that helpful anyway. So eBay sellers being eBay sellers, they either make something up out of whole cloth, or more likely they found an unrelated "johnson motor" ad for a different model and just did a copy-n-paste job.Īnyway. It at least doesn't exist in any of their catalogs. I think what happened is that Johnson never actually published specs for this model because they made it as a custom OEM part for someone. I don't think there are actually 50 different kinds of HC 970's - I think the HC 970's all have the same specs but no one knows what they actually are. Yeah, for some reason, everyone who's ever sold one of these on eBay seems to pull a bunch of random specs out of their anatomy and put it in their ad. The last motor I purchased was a Johnson HC970 (which many people recommend) but apparently they all have different specs and mine was too powerful for the zebs board. You could also go to and buy one of their pre-built $100 Stern shaker units, but that might have the same issue with overloading your controller.Įdited by mjr, 15 February 2018 - 06:03 AM. Build your own MOSFET driver if you have any idea what that means, or control it through a relay if not (that is, Zeb's board controls the relay, the relay controls the motor). (Don't we all.) If you have a Johnson motor in hand with the right properties, I'd try to find a way to make it work. There are about a gazillion DC motors out there, though, so there's probably something else you just need an assistant with all the time in the world to search through the entire Internet haystack to find the needle of interest. That appears to be the one that Stern is using in their current shakers. The canonical choice is the Johnson HC 970, but it's out of production, so you have to find them used on eBay. It's difficult to find in-production motors with the right properties.
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