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Trouble with 220V Electric Motor

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John In Texas

02-11-2003 13:14:09

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The motor is 1725 RPM on a gear driven metal lathe. At a low lathe RPM the motor starts and runs fine, however at a medium to high speed (600 to 1200 chuck RPM) the motor will start for about a second, stop for a second, start for a second and stop for a second, etc.

This goes through about 5 start/stop cycles or about 7 seconds then blows a 15 AMP time delay screw in fuse. The motor is rated at 9.5 AMPS and is on its own 20 AMP circuit.

I have replaced the 2 start / run capacitors with the same specs as the old ones and no change. I need ideas as to where to look next.

Thanks,

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Keith F

02-12-2003 10:05:29

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Re: Trouble with 220V Electric Motor in reply to John In Texas, 02-11-2003 13:14:09

Sounds like the motor is stalling. I would check the mesh of the gears on the lathe. They may not be meshing correctly if one is a sliding gear. Also, metal chips may have gotten into the gear meshing area and are binding the gears. Just another thought.

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Jim K

02-11-2003 16:58:04

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Re: Trouble with 220V Electric Motor in reply to John In Texas, 02-11-2003 13:14:09

John get a digital or analog voltage meter that is fairly acurate and take a voltage reading where the power comes into the machine and see what you have. Sounds like you have a voltage drop
Then check and see what you have for voltage at your main panel to see what the power company is supplying you with, Is the lathe very far from your main panel? should be within five volts of the nameplate rated voltage of the motor. next what is the size of the conductors that are feeding the machine you might want to increase their size to a number 12 or #10 awg to reduce voltage drop. post back with some readings and good luck.
Jim K

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T_Bone

02-11-2003 15:22:09

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Re: Trouble with 220V Electric Motor in reply to John In Texas, 02-11-2003 13:14:09

Hi John,

My first thought was the start winding was not dropping out but that would also happen at low speed. Since it runs fine at low speed and has a problem when switched to high speed, I would check for a binding gear box.

You can also use a ampmeter to check to see if the start winding is dropping out, if the motor load is increased when switched to high speed and no load amperage. If the run amps are fine at low speed, we are talking about a single speed motor?, and has high amps when switched to high speed then you have a gear box problem, not a motor problem.

T_Bone

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G Taylor

02-11-2003 14:47:10

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Re: Trouble with 220V Electric Motor in reply to John In Texas, 02-11-2003 13:14:09

Measure the voltage across both the main windings and the start windings while starting. is it steady or cycling? Could be a failing drum switch that has the forward/reverse, failing internal centrifical speed switch or failing start windings.

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