I had a cheap harbor freight 20" disc sander. worked great until I busted the capacitator. I removed the " start up" capacitator and repalced it. soon after the " run" capacitator died out on me.

Any way to figure out what caps volt/amp ranges I need ?


# Spindle speed …………………………..…… 900 RPM
# Motor (totally enclosed) …….. 2 HP, 3Ph/60 Hz, 220V

I know the numbers are on them. I can get the replacement one for the start up capacitor but I lost the RUN capacitor when my employee removed it to get them replaced.

 

You're not going to be able to figure it out unless you knew the rest of the circuit and components that are being used.

OR if someone else has the same tool and is willing to take it apart for you....

 

Capacitors are only used in 3 phase for power factor correction and usually 3phase only comes in 208 3phase or 240 volt and not 220 with out a buck/boost xformer. Maybe the sander is being provided with too much or too little voltage? Hard to believe the caps are just wearing out so quick. Could also be single phasing the motor as well, 1 of the 3 leads comes loose so its only getting 2 legs of power that can also cause it wear out and the motor will still spin.

 

I have one of these, shoot me a PM with a description of what numbers you need and where to find them. Mine is not a HF, some other brand.. enco perhaps

 

agree.


what we need to know is actual Voltage supplied to motor, any switches (safety,centrifugal switch)on the motor or sander, Amp draw on the motor when running at full load and startup,what you are sanding( metal dust can short out caps.)

and does this sander plug in or hard wire?... what is your voltage supplied to your workshop?

 

i grind a ton of metal on it. im pretty sure its the metal dust that shorted it out.


unfortunately im pretty illiterate when it comes to electrical issues.

I have the proper capacitor that the motor used for the " start up" cap. would that help figure out what you need for the " run" capacitor ?

 

metal dust shouldn't have anything to do with it but load and age of the motor and how long its been used can have an effect on the performance of the cap i change them day in day out lights, motors, diff types of equipment usually u would wanna step t up to the next available size

shoot me the right voltage shops are usually 208v

 

read da name plate

 

http://www.electricmotorwarehouse.com/PDF/TROUBL~1.PDF

I would check to see if its getting power on all 3 legs as stated before. that would cause these problems