Re: Electric Motor issues
[Re: cudaman1969]
#3026713
03/23/22 11:53 AM
03/23/22 11:53 AM
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TJP
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Maybe this isn’t the place to post this but I know this is where the smart guys are and I need answers. Lathe motor single phase 220 volts. Runs fine in reverse but forward I have to spin it by hand to move than it doesn’t have any torque to cut material. Like I said backward is great. What is the problem? I had a rotary switch and contacts look clean. Recently went through this and after being sold a new motor by the "tech support" if wound up just being a contactor that the members on here helped me diagnose. The contactor reverses which leg of the 220 the motor starts with, thereby setting the direction of rotation. Also look on ebay & amazon as the MFR was out of stock but plenty were available and cheaper to boot BTW: I have a nice 2 HP 220 single phase reversible motor for sale
Last edited by TJP; 03/24/22 08:48 PM.
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Re: Electric Motor issues
[Re: cudaman1969]
#3026970
03/24/22 05:28 AM
03/24/22 05:28 AM
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6PakBee
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That’s it? No electrical engineers on here today? Due to the fact that I'm not clairvoyant, what is the make and model of your lathe. Without knowing the particulars of your situation it's hard to give any useful comments.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Electric Motor issues
[Re: 6PakBee]
#3027012
03/24/22 09:47 AM
03/24/22 09:47 AM
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cudaman1969
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That’s it? No electrical engineers on here today? Due to the fact that I'm not clairvoyant, what is the make and model of your lathe. Without knowing the particulars of your situation it's hard to give any useful comments. What the motor is attached to has zero to do with why an electric motor spins great one way and barely the other. I described what the motor is in my first post question. But thanks for reply
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Re: Electric Motor issues
[Re: cudaman1969]
#3027017
03/24/22 10:01 AM
03/24/22 10:01 AM
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Stanton
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Originally Posted by 6PakBee Originally Posted by cudaman1969 That’s it? No electrical engineers on here today?
Due to the fact that I'm not clairvoyant, what is the make and model of your lathe. Without knowing the particulars of your situation it's hard to give any useful comments.
What the motor is attached to has zero to do with why an electric motor spins great one way and barely the other. I described what the motor is in my first post question. But thanks for reply Y'know, when you're asking for help even the dumbest questions deserve an answer !! (And I'm by no means saying 6PakBee's question is dumb !)
Last edited by Stanton; 03/24/22 10:02 AM.
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Re: Electric Motor issues
[Re: cudaman1969]
#3027034
03/24/22 11:03 AM
03/24/22 11:03 AM
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6PakBee
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That’s it? No electrical engineers on here today? Due to the fact that I'm not clairvoyant, what is the make and model of your lathe. Without knowing the particulars of your situation it's hard to give any useful comments. What the motor is attached to has zero to do with why an electric motor spins great one way and barely the other. I described what the motor is in my first post question. But thanks for reply It has everything to do with it. It COULD BE a simple split winding single phase motor with a starting switch or it COULD be a capacitor start single phase motor, or it COULD BE a capacitor start, capacitor run, single phase motor. With the lathe make and model, someone who was trying to help you could google the wiring schematic and offer some opinions. But as it is, my crystal ball is in the shop for repair so I can't be of any help to you.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Electric Motor issues
[Re: cudaman1969]
#3027065
03/24/22 12:57 PM
03/24/22 12:57 PM
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6PakBee
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That helps immensely. Reversing an AC MotorIt sounds like you have a bad reversing switch. Now that I've seen what you have, all the symptoms you describe of running acceptably in one direction and not running in the other direction unless manually turned indicates that the starting switch and starting capacitor are operational in one direction and not in the other. That typically is a switch problem. Your comment about the motor not having any torque when you manually spin it to start sounds like you have a capacitor start/capacitor run motor. The motor nameplate details will firm that up.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Electric Motor issues
[Re: cudaman1969]
#3027744
03/26/22 12:30 PM
03/26/22 12:30 PM
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TJP
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Got some pics, two capacitors front one sparked big time when touched with screw driver. Capacitors will do that as they store the electrons, cdo be careful as depending on the size of the capacitor the energy stored can be lethal That capacitor in the lower part of the pic (red and orange wires) is a strong suspect as it appears to have been leaking. Wait for one of the more astute members to verify. Wouldn't doubt you could swap the capacitors to confirm but also be aware they are polarity sensitive and can blow up if hooked up backwards
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Re: Electric Motor issues
[Re: cudaman1969]
#3027892
03/26/22 08:46 PM
03/26/22 08:46 PM
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6PakBee
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From your symptoms I guessed that it was a capacitor start, capacitor run motor. If you look at the attached sketch, the way the motor is reversed is that the two leads for the start winding are switched by the directional switch. Sometimes the run winding is switched but that is rare. What I think is happening is that in the direction that operates normally, the start and run windings are connected. But in the other direction one of the leads for the start winding is not connected which leads to a no start and poor peformance. My money is still on your reversing switch.
BTW, shorting a capacitor doesn't hurt it. In fact, if you are working on something with large capacitors it's normal procedure to discharge them rather than get knocked on your butt.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Electric Motor issues
[Re: cudaman1969]
#3027936
03/26/22 11:28 PM
03/26/22 11:28 PM
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6PakBee
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110 volts with a 220 motor? If you take readings to the neutral (ground) you can get misleading results at times. What I would recommend is measuring across the winding that is switched and check for 220 in both directions of the reversing switch. I'm going to guess that you won't have 220 in one of the two directions.
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Re: Electric Motor issues
[Re: cudaman1969]
#3028047
03/27/22 01:02 PM
03/27/22 01:02 PM
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6PakBee
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Whoa! There most certainly is 220 single phase in a typical service entrance. Water heaters and electric furnaces all use both of the 'hot' leads for 220 volts. A 220 volt outlet such as a NEMA 6-15 or a 6-20 will have both 220 leads and a ground, no 110 volt. My caution is that if you are measuring one side of a 220 volt winding to ground, you may not be accurately accessing the situation.
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