|
|
Post by tronicgr on Jan 21, 2015 17:55:40 GMT
I would still recommend Hall effect ones: www.digikey.com/product-detail/en/6153V1A180L.5/987-1602-ND/39458411/8” Shaft, dual ball bearing. Rotational Life: 50 million shaft revolutions with side load < 0.33 lb, 100 million with side load < 0.25 lb A little bit expensive on the $43.71 for low quantities, but if you get 10 or more is just $38.44 each. Thanks Thanos |
|
|
|
Post by vicpopo on Jan 21, 2015 19:50:15 GMT
Hi ,
Thanks Steven for your answer ! I had the same problem because the sensor was mounted in front of the gearbox shaft.To avoid mecanical damage I changed my mounting and Thanos has shown the system on his blog.I wasn't wanting this system at the begining because it's more expensive and I had to let machine some pieces ( pulleys) But now I have no problem because the strenght is by the pulley assumed and I didn't need anymore that the sensor shaft must be perfect coaxial with the gearbox shaft.
Thanks one more time for you proposition helping me if I try tu use Ian software.
Regards
|
|
|
|
Post by stevant on Jan 22, 2015 16:46:04 GMT
Anytime Vic......
Thanks again for the info Thanos. I downloaded your 2.0 software also. Awaiting the Auto-tune!!!!
|
|
|
|
Post by stevant on Jan 25, 2015 12:55:25 GMT
Hi all,
Well I changed the sensor with a new one and it worked fine until yesterday. I turned on my platform and once again my number 3 motor was turning all by itself. It appears the brand new sensor I installed the day before failed. I used it once and it already failed. I am assuming it is the sensor again as whats happening is what happened last week when the original sensor failed. I'm thinking maybe I purchased a bad sensor? It worked perfect when I installed it the other day but now it is no good, I'm hoping it is that and nothing else. I ordered a few more and will change again once they come in. I'm sure it is not the wire nor the inverter as I have thrown no error codes and the inverter seems to be working fine. If the new sensor does the same thing I'm thinking a problem with the AMC? I spoke to Thanos who thinks it's highly unlikely but one never knows. Fortunately if there is a problem with the AMC I have another one on order and will send this one back to Thanos and ask him to take a look at it. I am feeling confident its another bad sensor. I might have received a bad one from Digi-Key. Maybe I applied too much heat when soldering? It is turning very smooth, an internal connection may have failed.
I do want to mention that when the original sensor failed and locked up, the entire sensor rotated due to the motor now free turning. The wires did cross and touch each other causing the AMC unit to shut down, it actually powered off like it shorted. Once I quickly removed the crossed wires it powered up and the platform was back up and running, except for the one that caused the problem. Like I mentioned above I installed the new sensor and it worked for the one time then it failed again. Could that have caused something to fail in the AMC? Does that shed some light?
Thanos, is there a way to hook up the sensor directly to the inverter bypassing the AMC to make sure it is working? Just for testing purposes. This would isolate the problem even further and see if the problem is within the AMC. You might have mentioned that to me last night when we spoke but I'm turning 50 come April and my brain is not soaking in as much anymore......haha!
I'll keep you all posted!!! Frustrating!!!!! :-)
Steven
|
|
|
|
Post by stevant on Jan 25, 2015 15:32:31 GMT
Another observation. I completely removed the sensor from the motor. I actually unsoldered it so there were only the White, Red and Black wire. They were not connected to anything. I then turned on the AMC and the inverter to power up the motor. The motor itself was no longer rotating. It was moving up and down from center randomly but basically staying on center. I then reconnected the sensor to see what would happen to the motor. I hooked up the ground and first added the red wire and it turned in one direction. I then removed the red and added the black and it moved in the other direction. When I added all three it moved in the same direction as if the black was not even connected. All during this time rotating the stem on the sensor had no effect on anything while I was turning it. It would not stop the motor or control any direction of rotation. Can I conclude from this that it appears the new sensor is bad??
Any thoughts??
|
|
|
|
Post by vicpopo on Jan 25, 2015 21:45:27 GMT
Hi Steven ,
First with no sensor feedback , normally the motor should turn continuously ! Right Thanos ?
Second : could you make a pic from your sensor mounting , it's better to understand for me .
And yes if you conect your sensor and hold it in your hand when motor rotating , normally when you turn the sensor shaft and reach 2,5volts the motor must stop.
Maybe check if your inverter setup on this motor is the same as the 5 others .
|
|
|
|
Post by stevant on Jan 25, 2015 22:56:12 GMT
When I had the sensor connected the motor was rotating and I could not stop it. That is what happened the first time which is why I changed the sensor. Once I changed it, it worked again. Now it is turning again and I cannot stop it. When I remove the sensor then it stops turning. I'm assuming its the sensor again. I know its not the wire as when I reconnect the sensor it causes the motor to turn like I mentioned in my previous post. I'm going to solder a new sensor to see what happens when it is delivered. If that does not work its either the inverter or the portion of the AMC that controls that sensor. I
|
|
|
|
Post by stevant on Jan 25, 2015 23:39:30 GMT
Take a look at the video and you can see how it is moving with no sensor. I only have the one motor on to show. I hope the new sensor will rectify this. Thanos....any ideas?? 
|
|
|
|
Post by tronicgr on Jan 25, 2015 23:48:42 GMT
That is normal with no sensor connected. It picks up noise from the environment. Connect that pot to another input on the AMC1280USB to check if it gives correct values. Or swap the sensor connection from another motor tithe input that the bad sensor was connected to check if its issue with the AMC1280USB ADC input. A good way to connect the sensors without soldering them (so you can quickly replace them or test them) is to use screw terminal connectors like I did in these photos: www.dropbox.com/sh/8xh0bz4xdxdbmk2/AAAlrGPuSyNsLXmhf7W3BoJxa?dl=0See it here: Electrical Screw Terminal Block ConnectorThanks Thanos |
|
|
|
Post by stevant on Jan 25, 2015 23:54:57 GMT
Can I change the input from the side with the screws that I am using for my sensors to the 3 prongs on the face of the AMC for sensor #3? I know it is the same input but will that be a different than the side screws?
It could still be the sensor, correct? |
|
|
|
Post by tronicgr on Jan 26, 2015 6:21:29 GMT
The analog inputs on the AMC1280USB are offered either as screw terminals or as simple 3pin connectors. So yes you can use either one. I mark on the board which pin is for signal, +5v and Gnd.
It could be the sensor, yes. I never soldered them before. It could be thermal damage from the iron heat. Always used them with screw terminal connectors.
Something else I noticed in your electronics box. Can you place some shielding around the AMC1280USB from being exposed so close to the vfd inverters? I mean they produce lots of high power PWM for the AC motors that can contribute to the electrical noise from the 60Hz mains and affect the analog signal on the AMC1280USB... perhaps you could have the AMC1280USB into a metal case grounded.
Thanks
Thanos
|
|
|
|
Post by stevant on Jan 26, 2015 15:08:20 GMT
Thanks for the advice Thanos............would you know where I could get a box to shield the AMC?? What kind of shield?...piece of sheet metal??
Thanks as always,
Steven
|
|
|
|
Post by riton39 on Jan 26, 2015 15:43:57 GMT
I am shielding tests to see if there were any problems on my config.
to the tests I had covered a plastic box with aluminum foil.
all connected to the earth.
and after oscilloscope measurement, I did not have any significant noise.
later I also was considering a metal case
of the inverter PWM frequency is how much?
this may affect noise. |
|
|
|
Post by tronicgr on Jan 26, 2015 17:23:19 GMT
Thanks for the advice Thanos............would you know where I could get a box to shield the AMC?? What kind of shield?...piece of sheet metal?? Thanks as always, Steven You can use a metal box or can... At my work, I have to test sensors that amplify brainwave signals 64 times (can also catch a fly's heartbeat across the room LOL) into a metal grounded can. Its much more quieter in there electrically speaking.  Thanks Thanos |
|
|
|
Post by vicpopo on Jan 26, 2015 19:11:52 GMT
Hi ,
If that is a shield problem , why only one sensor is affected and only this one ?
One suggestion Steven , peharps use a new wire to connect your sensor to the amc to avoid a wire problem .If you have the same problem that means that that comes not from the wire.And Obviously use shielded wire.
And as Thanos said Use the screw terminal to connect the sensor (I use this solution instead pins ).Check also the solder from screw terminal.
|
|
