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Start capacitor for 3hp motor wired for 230

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Forum topic by hkmiller posted 05-25-2018 11:55 AM 938 views 0 times favorited 8 replies Add to Favorites Watch
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hkmiller

100 posts in 231 days


05-25-2018 11:55 AM

My DELTA unisaw has a 3hp single phase Baldor motor that can be wired for 115 or 230 volts.

It has a starting capacitor (vanguard bc-800) that is 829-995 MED, 110-125 VAC.

Since the capacitor is rated at 110-125 VAC, and I am running motor at 230 VAC, is the capacitor even used for starting?

-- always something


8 replies so far

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TheFridge

10360 posts in 1635 days


#1 posted 05-25-2018 02:05 PM

It’ll never see 240v. And yes. It’s most definitely used for starting.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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hkmiller

100 posts in 231 days


#2 posted 05-25-2018 06:21 PM



It’ll never see 240v. And yes. It’s most definitely used for starting.

- TheFridge

so even though that capacitors rated at 110 130 volts and the saw is wired to run at 230 it’ll still use lower voltage capacitor

-- always something

View splintergroup's profile

splintergroup

2313 posts in 1371 days


#3 posted 05-25-2018 06:35 PM

The capacitor is in series with the starting winding so it is never placed directly cross the full voltage being applied to the motor.

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MrUnix

6949 posts in 2348 days


#4 posted 05-25-2018 06:37 PM

The windings will only see 120v regardless of how you have it wired. The only advantage of going to a higher rated voltage capacitor is that it should last longer, but it will also probably be a bit bigger (physically), so it may not fit depending on how yours is mounted.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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hkmiller

100 posts in 231 days


#5 posted 05-25-2018 06:42 PM

Okay the reason I posted the question is I was able to start the Saw with my 220 volt generator outputting 20 amps when I tighten up the belts on the pully it would not start I guess due to the extra load on the motor and maybe the generator was not able to put out enough amps to start even though it’s rated for 20 amps how does that sound

-- always something

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MrUnix

6949 posts in 2348 days


#6 posted 05-25-2018 06:47 PM

What is the FLA of the motor and what is the rating of your generator? I’m betting that the generator isn’t sufficient for the startup load of your motor, combined with the fact that when a large load is placed on a generator, it slows down for a bit due to the sudden load. Generators are not really designed for inductive loads close to their rated output.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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hkmiller

100 posts in 231 days


#7 posted 05-25-2018 06:53 PM



What is the FLA of the motor and what is the rating of your generator? I m betting that the generator isn t sufficient for the startup load of your motor, combined with the fact that when a large load is placed on a generator, it slows down for a bit due to the sudden load. Generators are not really designed for inductive loads close to their rated output.

Cheers,
Brad

- MrUnix

FLA is 16@230vac. Generator is 20amps@230

-- always something

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hkmiller

100 posts in 231 days


#8 posted 05-25-2018 06:55 PM

-- always something

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