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Old 10-08-2020, 11:40 AM
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Default 10 horsepower rotary phase converter

Im building a 10 horsepower rotary phase converter. I've already got a potential relay and a motor contactor rated for 10 hp at 240 volts three phase.

I've got a 250 uf start capaciter and some terminal strips on the way. Should be here Saturday.

After I get a motor I'll get some volt readings and figure out what I need to balance the output.

I've already got a enclosure to house the relays and capacitors.

Where's a good diagram to wire all this up?

I assume I need a double pole single throw switch to activate the motor relay. It has a 220v coil.
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Old 10-08-2020, 07:39 PM
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Working on a layout. Found a 120v coil Allen Bradley relay for the start capaciter.
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Old 10-08-2020, 08:20 PM
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That Packard DP contactor is not really up to the task. It’ll last for a while, but will fail fairly soon. DP’s are made for easy, fast starting loads like A/C compressors and deep well pumps. You really need a NEMA size 2 starter in your favorite brand supported locally.
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Old 10-08-2020, 08:49 PM
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Would a lighting contactor work? Got one of thise laying around. Three pole 60 amp rating.
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Old 10-08-2020, 09:04 PM
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Wiring schematics
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Old 10-08-2020, 09:27 PM
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You got enough of a start there Red use what you have and learn.

Yes those contactors won’t last long. For what you are doing it will last a while.

At the rate you are picking up equipment you should run into a box of old Allen Bradley stuff that will only last till your kids get rid of it.

Digr has linked you to a good start on info.

I have a 3 wire start stop on mine with a timer that drops out the cap.

Look up Cutters info on his phase converter it helped me quite a bit.

Scott


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Old 10-08-2020, 11:25 PM
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I forgot a had a back panel with various electrical components hiding under a tarp at my house.

From it I pulled a section of din rail, the Allen Bradley relay and wire terminals and fuse holders you see.

Did some more digging and found a 240v primary and 120v secondary control transformer. Also Allen Bradley.

The coil on the contactor is 220 while the relay coil is 120.
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Old 10-09-2020, 04:21 AM
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Quote:
Originally Posted by OldRedFord View Post
Would a lighting contactor work? Got one of thise laying around. Three pole 60 amp rating.
Yeah a lighting contactor will work, but you ought to have a overload relay on it. I've seen many that didn't have them though.
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Old 10-10-2020, 02:50 PM
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Got my hands on a 10 horse motor for the idler. It's 240/480 but only one set of leads coming out and can't be rewired. Let's hope it's 240.
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Old 10-10-2020, 03:05 PM
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Quote:
Originally Posted by OldRedFord View Post
Got my hands on a 10 horse motor for the idler. It's 240/480 but only one set of leads coming out and can't be rewired. Let's hope it's 240.
The tag should have the voltage XXX out, but many motor shops don't do that. If it's a 3 lead, most likely it's for 460 now, especially if the leads are 14awg.
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