control stepless screw compressors

[HVACRsaurus]

Hi,

Late arrival here..

Good advice All!

How's about a calculation of Actual Running Amps versus Full Load Amps (inferring Load)

Yes, it only applies when running & we will not see 0% neatly through 100% but I'd still expect the value to be repeatable and meaningful..

Happy tinkering

[ARIEL979]

the problem is the current is change
from my experience the minimum and maximum is change in cold or hot day
So if you want to knew that the first compressor is full load before startup the second compressor it's a problem

[ARIEL979]

From my experience the minimum and maximum is change in cold or hot day
So if you want to knew that the first compressor is full load before startup the second compressor it's a problem

[Segei]

From my experience the minimum and maximum is change in cold or hot day
So if you want to knew that the first compressor is full load before startup the second compressor it's a problem

Use time delay.
Assume that it takes compressor 1 min. to increase capacity from 0% to 100%. If suction pressure above set point for 2 min. second compressor can start and you know that first compressor is fully loaded.