RonRock
Aluminum
- Joined
- Mar 18, 2012
- Location
- Underwood, IA
So I finally made the time to assemble my RPC.
I used an old 7.5HP General Electric motor that I scrounged from a friend many years ago in plans for this build. Here is a photo of the tag,
I had a hard time figuring the necessary heaters for the AB Overload Relay 592-BOV16 that I used. They make that part very confusing to someone new to that aspect. Anyway I ended up figuring that I needed W43's.
Now that the unit is running I can hear that the motor bearings are very noisy! Too loud to tolerate for very long in the shop. But I am having an issue with the Overload Relay getting hot and popping the circuit.
I can feel the heat in the W43's and they get too hot to touch. But cool down and I can start up the unit again after. So I was able to run the RPC long enough to take some measurements.
My line in is 241V.
My 3 phase voltages are,
A-B = 242V
A-C= 240V
B-C= 262V
So it seems that I need to do some balancing on the run caps. Not surprised at that.
So how do I get the Overload Relay to cool down? Is it a problem with the heaters that I choose? An issue with the motor itself? Windings? Or the bearings?
I did take the motor apart for a good cleaning and cleaned out the bearings and fresh grease today after my first test yesterday. Reassembled and still noisy bearings, and got the test results posted.
So I don't know how to proceed. I hate to spend money on bearings if the motor is just bad. Not sure of the heaters that I spec'd. Maybe they are too "small" for the load.
Any pointers on how to move on this? Would balancing the output have any affect on the heaters?
Can I check the windings?
I used an old 7.5HP General Electric motor that I scrounged from a friend many years ago in plans for this build. Here is a photo of the tag,
I had a hard time figuring the necessary heaters for the AB Overload Relay 592-BOV16 that I used. They make that part very confusing to someone new to that aspect. Anyway I ended up figuring that I needed W43's.
Now that the unit is running I can hear that the motor bearings are very noisy! Too loud to tolerate for very long in the shop. But I am having an issue with the Overload Relay getting hot and popping the circuit.
I can feel the heat in the W43's and they get too hot to touch. But cool down and I can start up the unit again after. So I was able to run the RPC long enough to take some measurements.
My line in is 241V.
My 3 phase voltages are,
A-B = 242V
A-C= 240V
B-C= 262V
So it seems that I need to do some balancing on the run caps. Not surprised at that.
So how do I get the Overload Relay to cool down? Is it a problem with the heaters that I choose? An issue with the motor itself? Windings? Or the bearings?
I did take the motor apart for a good cleaning and cleaned out the bearings and fresh grease today after my first test yesterday. Reassembled and still noisy bearings, and got the test results posted.
So I don't know how to proceed. I hate to spend money on bearings if the motor is just bad. Not sure of the heaters that I spec'd. Maybe they are too "small" for the load.
Any pointers on how to move on this? Would balancing the output have any affect on the heaters?
Can I check the windings?