American rotary ADX-60 high amperage on idle?

[JST]

A standard Phase-perfect of a given rating will start any motor up to that rating.

They DO seem to have a "low cost line" that is not as heavy-duty, I forget what they call it, and it may be referenced above.

 

[jim rozen]

I am looking back over this thread and cannot see if the actual power consumption of the idler in question (the question in the title...) was ever determined with a watt-hour meter. Just curious for my own data....

 

[johansen]

I have never seen PhasePerfect, how does it handle large start up loads?

There are 4 second and 10 second ratings in the literature.

A 10hp phase perfect is rated for something like 150 amps 3 phase output for 3 or 4 seconds, which is what you need to start a 10hp motor (230v)

 

[thesjg]

There are 4 second and 10 second ratings in the literature.

A 10hp phase perfect is rated for something like 150 amps 3 phase output for 3 or 4 seconds, which is what you need to start a 10hp motor (230v)

Since 2019 (I believe), rather than specifying a current for a fixed period, we include a series of overcurrent/motor starting sourcing limit charts in the Phase Perfect manual. These are a more accurate representation and show the curve of current over time a Phase Perfect can supply. These emulate a Class 10 trip curve.

PT's need large IGBT's compared to a similar sized VFD to handle the locked rotor current draw that comes with starting a motor "across-the-line". Then, we reign it in to stay inside the thermal design envelope.

You typically wouldn't need 150 A for several seconds to start a 10 horse, but you might if it has 180psi of air pushing back against a piston pump hooked up to it, or similar. That's what we design around, the tough industrial loads, such as compressors, elevators (hydraulic pumps), etc., which makes it easy to say -- yes, the 10 Horsepower PT or PTE will start your 10 horsepower motor.



Charts for other models are available in the Phase Perfect Manual in the downloads section of our website. https://www.phasetechnologies.com/support/downloads

 

[JST]

I am looking back over this thread and cannot see if the actual power consumption of the idler in question (the question in the title...) was ever determined with a watt-hour meter. Just curious for my own data....

Not that I noticed. A wattmeter would be a little more direct.....

But it does not matter, lagging (or leading) amps will pop the breaker just as well as in-phase amp. For the breaker, all amps are the same.

To your point, I wondered if the number given for the RPC was for a unit fully power factor corrected..... although even for that it seemed low.

 

[jim rozen]

"1) is the converter in a residential bulding? If so it is probably fed through a watt-hour meter. If so then turn off all other loads and run only the rotary converter for a known time. Calculate the power used."

From post 8 in this thread. It apparently is in a buildling metered via a WH meter. It would answer the original question neatly.