Finding a part for Oli-Phase rotary 3 phase converter

[mavenblueprint]

Hi all,

Has anyone run into using/updating Oli-Phase MP15 rotary 3 phase converter parts built my Molitor? We have several leaked capacitors in need of replacement but the business seems to be out of business (since maybe 2006). I've been calling phase converter companies but they seems to not want to sell capacitors if it's not their brand.

The capacitors are part number is: 3530B4A0130A250A3 (9231) P/N-122

Thanks!

[ShawnM]

Instead of looking at the part number are there any values on the caps? They usually always have the microfarad, voltage and temp range stamped on them somewhere. You can match up a suitable replacement with those values.

[mavenblueprint]

After looking at the entire capacitor there are no markings of farad readings or anything else for that matter.

We are making assumptions based on a multimeter reading for microFarad reading and voltage appears to max out at 600 but that's based on the panel not the capacitor itself.

[tblough]

Google says that might be a Phillips 130uF 250V capacitor based on this: https://www.ebay.com/itm/143179042852

I wouldn't buy used caps off eBay, but it provides enough info to narrow the P/N and use reputable electronics companies like Digikey or Mouser to source replacements.

Also judging from the eBay photo, you may need to remove a cap to read the full label.

[mavenblueprint]

Thanks @tblough for looking. I looked closer at the capacitor from ebay and the numbers don't match (only the first 5)

The pictures are from the inside the box however we did remove them to see what else is visible but those were the only 2 numbers.

Thanks for the suggestion of Digikey and Mouser as a potential place to look for a replacement!

[tblough]

The intent wasn't to find you a part on eBay. The eBay part was to demonstrate the part number construction made it a likely Phillips device. By comparing the two part numbers you could then determine the voltage and capacitance ratings. Armed with that information, you could then perform a parametric search on Digikey, Mouser, or your electronics supplier of choice and find a suitable substitute

[glbreil]

The black ones are starting capacitors and they’re only used for getting the motor started the generator third phase the silver ones are run capacity and they’re the ones that adjust the voltage. Probably go down to the refrigeration or air-conditioning parts supplier and pick up the start capacitors you need. Most start capacitors have arrange that varies if you think the capacitors you have are 130 UF then you can pick up capacitors across that range and are operated 250 V and they’ll work just fine. They only stay engaged till the idle motor gets up to speed and generates enough back EMF to engage the potential relay, which takes them out of operation.

Gary

[glbreil]

I probably should have added that an exact mount of capacitance isn’t required. A good rule of thumb for a quick, but not snap start is 75uf per horsepower. Which would be 1125uf or 112.5uf each since it appears you have 10 start capacitors.

Some one mentioned they found capacitors with a similar number that were 130uf which would make your total 1300uf which would just add a little snap to the start.

You just don’t want to go over 100uf per horsepower which in your case would be 1500uf total.

Placing the capacitors in parallel like they are in your cabinet adds up the capacitance for each and leaves the voltage range the same.

Thanks Gary