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Thank you tool_scrounge. I am perfectly stuck. Not big money in scheme of life but: Option 1: $800 for new 10HP RPC that I am told will start my 7.5HP wood dust collector. Sell my 5HP 3ph compressor. Option 2: buy 1ph 7.5 HP and 1ph 5HP motors to retrofit my dust collector and compressor...

Well - indeed, the motor does not have a plate. u3b3rg33k: I did not realize VFD was viable, I thought people avoided them for larger loads. jar944 - Thank you for clarification. I guess i will try to calculate what Amperage circuit is needed, and figure out if thats feasible for a home...

Firstly: thanks to the guys who replied to my post. I did look at an online calculator after I posted my questions. But, i just fixated on the 10HP start. To cruzan80: There is no visible plate on the motor. But, i will lift it up tomorrow (june 10th 2024). Perhaps, for some odd reason, it...

I am at monkey-level when it comes to electrical. I got a rotary phase converter. I was told it was made ~ 10-13yrs old and the fellow used it just a bit in the first year or so. See 5 pics below - found papers inside the box. Motor looks like some Viet Nam era contraption to me - perhaps...

To micromind and larry_g: Wow, thank you - two very unexpected replies. I never imagined external dims would give clues to a motor's HP. I figured mounting types (e.g. 184T and such) were somewhat arbitrary. And larry_g - you cant imagine how great it is to tap the wisdom of this forum...

I am going to be receiving a ~10-15yr old rotary phase converter (RPC) (standard motor+box look) that is completely unmarked. May be marked inside the box - I will see in few days. Q1: Is there a way to test the RPC motor to find out its HP and if it is OK? Q2: Can i test the converter and its...

Cruzan80: I am not sure what you're respond to in above post. But: Q1: To clarify, if I have a properly sized rotary phase converter, the downstream 3ph motor works at its metal-stamp HP? Correct? Q2: I've been told to converter should have 2x HP of the 3PH motor. Is the true...

Thank you Geobruin. That all makes sense. So, if I include regulators that just go up to 125, I change from just 2 options I found - to a large number of units. So - good - will reconsider brands+modelNo's. I am aiming to use air driven polishers to clean off stone curbing, and what is...

Thank you to the 3 respondents. Marinusdees re 3-phase: I'm sure to post rotary phase converter questions pretty soon. I will skip electronic tank drain for now - per Cvairwerk and Geobruin. Get it all running with a drain pull valve (i.e. w/ the 5-ft wire) then re-consider. I am looking at...

Class dunce again: I apologize if these Qs are repeats - I have not looked thru our forum enough yet. I have rare support from a parts rep - so scrambling to specify what I need for a used compressor within a day or so - before I lose the guys attention. Can I get opinion on a service side...

OK. That concludes it. Thank you both for the reality check. I was 'afraid' of this 3-phase monstrosity at first. Slowly - getting more familiar w the whole thing.

First post from the class dunce: Does anyone have a Dur-o-line compressor? I bought one used (DO580V. 2-stage, 80-gal, vertical, 3-phase.) It is unclear how to get specs for parts. The only site showing Duroline is oemair.com. I may be finally getting a commercially focused oemair.com...