So I've attached a couple images of one of the three motors. They are ~1 HP motors. I have included the name plate images, and images of the gear box. Here is a bit about the setup:
They are fed from an electronic phase converter/power supply. The input is 240V single phase. The converter outputs ~240V delta. I am feeding each motor with a forward-reversing motor starter and overload. I have confirmed motor operation in forward and reverse direction. They operate just fine from a controls point of view.
The conveyor was purchased used, for a cheap price. When I checked out the motors, all motors were wired up for 460V. Given that we were on 240V delta, I changed them over to 230V. I've wired up many three phase motors, I'm sure they are correct, but I have included a picture here as well. I also 100% confirmed this matches the wiring diagram provided on the motors yesterday.
The problem is that these motors are getting HOT. I mean, hot enough that I can smell the windings. This is happening FAST too. Even if you run them for just a little bit and turn them off, the heat transfers to the outside and after a couple minutes the motor gets hot to the touch. It isn't normal.
Here is what I've done:
Confirm that the motors are wired for 230V
Take an amp draw. On two of the motors I'm reading 0. On one I'm ready .25. This is worrisome, but not the end-all. These motors are supposed to draw ~2A FLA, however they were drawing ~3A.
Take voltage reading at the peckerhead while running. I get an even ~240V across. I don't remember exact numbers, but it was nothing to cause any concern. I usually look for more than a couple volts difference, and the difference was inconsequential enough that I dismissed it.
Here are my additional thoughts:
The amp draw being high doesn't make sense. I would expect to see about 1.6-1.8 given that the voltage is higher than nominal. For some reason these motors are using more power than they should be. I'm really leaning toward this being a mechanical issue.
These motors are 72% efficient, so I would expect that they run hotter than other motors, but I wouldn't expect to smell windings on any motor.
I have not yet megged and/or checked the resistance of the windings. I do, however, suspect that these motors may have been ran at the wrong voltage and that the windings have shorted out, causing the increased voltage draw.
One motor tripped the overload. Despite being set at 2.8A and drawing over 3A, two of the motors did not trip the overloads. I'm wondering if these overloads are bad.
What are you guy's thoughts?
Also: there are two images of the inside of the peckerhead. One is original 460V, the other is where I moved it over to 230V (where the wires are crossing the terminal block).
They are fed from an electronic phase converter/power supply. The input is 240V single phase. The converter outputs ~240V delta. I am feeding each motor with a forward-reversing motor starter and overload. I have confirmed motor operation in forward and reverse direction. They operate just fine from a controls point of view.
The conveyor was purchased used, for a cheap price. When I checked out the motors, all motors were wired up for 460V. Given that we were on 240V delta, I changed them over to 230V. I've wired up many three phase motors, I'm sure they are correct, but I have included a picture here as well. I also 100% confirmed this matches the wiring diagram provided on the motors yesterday.
The problem is that these motors are getting HOT. I mean, hot enough that I can smell the windings. This is happening FAST too. Even if you run them for just a little bit and turn them off, the heat transfers to the outside and after a couple minutes the motor gets hot to the touch. It isn't normal.
Here is what I've done:
Confirm that the motors are wired for 230V
Take an amp draw. On two of the motors I'm reading 0. On one I'm ready .25. This is worrisome, but not the end-all. These motors are supposed to draw ~2A FLA, however they were drawing ~3A.
Take voltage reading at the peckerhead while running. I get an even ~240V across. I don't remember exact numbers, but it was nothing to cause any concern. I usually look for more than a couple volts difference, and the difference was inconsequential enough that I dismissed it.
Here are my additional thoughts:
The amp draw being high doesn't make sense. I would expect to see about 1.6-1.8 given that the voltage is higher than nominal. For some reason these motors are using more power than they should be. I'm really leaning toward this being a mechanical issue.
These motors are 72% efficient, so I would expect that they run hotter than other motors, but I wouldn't expect to smell windings on any motor.
I have not yet megged and/or checked the resistance of the windings. I do, however, suspect that these motors may have been ran at the wrong voltage and that the windings have shorted out, causing the increased voltage draw.
One motor tripped the overload. Despite being set at 2.8A and drawing over 3A, two of the motors did not trip the overloads. I'm wondering if these overloads are bad.
What are you guy's thoughts?
Also: there are two images of the inside of the peckerhead. One is original 460V, the other is where I moved it over to 230V (where the wires are crossing the terminal block).
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