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Electric motor problem

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Robert in Md.

05-27-2001 19:31:35




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My son and I spent 4 hours installing my recently acquired 5 Hp single phase motor into my 20 inch wood planer. Had to remake the motor mounts. The motor ran fine before installation. Put No. 10 wire to it with plug no switch and pluged it in . Planer ran fine even planed a board down to 1/2 inch. Unpluged motor to adjust belts , when plugged in again, blew 30 amp buss fuse. replaced fuse , tryed again, motor started for a second and blew the other leg of the circuit. This happpen several times, whats wrong? Motor ran fine for about 10 minutes , now not at all. Anybody got any suggestions? Motor is suppose to draw 23 amps. Are the 30 amps fuses to small. Thanks.

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Robert in Md.

05-30-2001 19:38:18




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 Re: Electric motor problem in reply to Robert in Md., 05-27-2001 19:31:35  
I felt the motor and it was just slightly warm about like it should be after 10 minutes running. I was using time delayed 30 amp fuses. I took the motor out of the planer and plugged it in last night , it ran fine. I'll check how much current it draws when I can borrow a meter. Thanks for the suggestions.



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CR

05-30-2001 09:29:57




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 Re: Electric motor problem in reply to Robert in Md., 05-27-2001 19:31:35  
The 30 amp fuses are the correct size for a motor with a full load amperage of 23 amps. When designing industrial equipment we use full load amps multiplied by 1.25. 23 x 1.25 = 28.75. WE would then take the next higher fuse size which would be 30 amps. A few couple things to check:
1) With all power disconnected make sure the motor or planer is not binding causing the initial inrush amperage to remain high for to long. 2) make sure your fuses are slow blow or time delay as fast acting fuses will fail when the motor starts.

If there is no binding and you are using slow blow fuses I would disconnect the belts and restart the motor with no load. Use a current meter to see what current the motor is drawing. In a no load condition the motor should not draw much current. If the current is reading is near or at the full load amp rating then the motor is miswired or defective.

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tools

05-29-2001 20:54:04




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 Re: Electric motor problem in reply to Robert in Md., 05-27-2001 19:31:35  
Hey Robert,

It's possible that the motor got REALLY hot during the first ten minutes, then melted some enamel off the windings while it was sitting. Did you ever get whiff of ozone, or see the smoke leak out of this motor? A good visual inspection of the windings might be in order.

Tools



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Farmer-Gene

05-28-2001 03:14:59




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 Re: Electric motor problem in reply to Robert in Md., 05-27-2001 19:31:35  
A 5hp motor is drawing close to 50 amps on initial start up so I would use larger fuses, should be using a knife switch to turn off and on instead of a plug in.



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