Correction of capacity

[unit01]

Hi by all!
In Russia often are delivered of the compressors in structure chillers on a voltage 400V-415V. But here voltage - 380V.
That in your opinion is correct:
1. It will not call decrease of capacity.
2. It will call decline of capacity and on how much?
3. The capacity will increase.

 

[jbartos]

Suggestion marked ///\\\:
In Russia often are delivered of the compressors in structure chillers on a voltage 400V-415V. But here voltage - 380V.
///Clarify the Horsepower (HP) rating\\That in your opinion is correct:
1. It will not call decrease of capacity.
///As long as the HP rating is the same for 400-415V and for 380V.\\2. It will call decline of capacity and on how much?
///There will be some decline if you apply 400V rated motor to 380V power supply since the torque T ~ |E|**2. However, if the shaft HP stays the same, then the motor will draw more current and it will overheat somewhat and age faster.\\3. The capacity will increase.
///If you apply 380V rated motor to 400V or 415V, then the torque increases and the motor may deliver more shaft HP depending on the Load Torque - Speed curve profile.\\\

 

[unit01]

Hi jbartos!
I have real object with such problem.
The compressor(73HP) under the electrical characteristics
should have 136FLA, however has 110FLA only.
Thus the general decline of productivity system reaches 15%.
And question:
The voltage is guilty or something else?

 

[jbartos]

Suggestion: This may also need a mechanical adjustment, e.g. psig or atmosphere setting may need to be higher. A compressor delivering the higher pressure will draw more current.