Help with choosing replacement capacitor

TheFiveStripes · Aug 31, 2019

I recently had the motor on my Delta dust collector stop working. It was setting off the breaker on the side of motor after just a few seconds of turning on. After researching I discovered the problem with this motor is commonly the run capacitor. When I opened the cover to the capacitor I found one of the wires burned off and the top bulging. So, I need to know if the attached photo is the correct replacement for the other photo of the old black capacitor. Thanks for any help.

[ElectriciansForums.net] Help with choosing replacement capacitor

Megawatt · Aug 31, 2019

TheFiveStripes said:
I recently had the motor on my Delta dust collector stop working. It was setting off the breaker on the side of motor after just a few seconds of turning on. After researching I discovered the problem with this motor is commonly the run capacitor. When I opened the cover to the capacitor I found one of the wires burned off and the top bulging. So, I need to know if the attached photo is the correct replacement for the other photo of the old black capacitor. Thanks for any help.View attachment 51787 View attachment 51788

Welcome fivestripes I honestly don’t think replacing that is going to help, in my opinion I would have to say that your motor is fried. Never seen one burnt that bad

TheFiveStripes · Aug 31, 2019

Megawatt said:
Welcome fivestripes I honestly don’t think replacing that is going to help, in my opinion I would have to say that your motor is fried. Never seen one burnt that bad

Thanks for your reply. Do you think there is any harm in trying the replacement to see if the motor still works since it’s an inexpensive part?

Megawatt · Aug 31, 2019

TheFiveStripes said:
Thanks for your reply. Do you think there is any harm in trying the replacement to see if the motor still works since it’s an inexpensive part?

I’m not allowed to tell you but be careful if you do it please

Lucien Nunes · Aug 31, 2019

Yes it is the correct part. It is rated for a higher voltage which is good but may mean it is physically larger, make sure it will fit in the housing. As Megawatt says, the motor winding might be damaged; it is difficult to test without specialised gear although if there's no.sign or smell of burnt varnish and it runs at normal temperature without excess noise or vibration when a new capacitor is fitted, it's probably fine.

telectrix · Aug 31, 2019

what he said ^^^^^. for < a tenner, well worth a punt.

Lucien Nunes · Aug 31, 2019

Just a thought - the old cap was plastic cased, your suggested replacement is metal. If the metal can is accessible once fitted, it should be earthed. Make sure it has adequate clearance from contacting terminals etc. If suspect, find a plastic-cased replacement.

freddo · Aug 31, 2019

Megawatt said:
Never seen one burnt that bad

Have seen and replaced so many failed caps, several had turned into a melted blob. Motors protected with a proper overload that is set correctly it will likely have no thermal damage.

Help with choosing replacement capacitor

TheFiveStripes

Megawatt

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TheFiveStripes

Megawatt

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Lucien Nunes

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telectrix

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Lucien Nunes

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freddo

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