Thank you engineers for sharing your experience using VFD with centrifugal pumps with a liquid that does not have a fixed viscosity. On Friday we are going to install a network analyzer for the input power before the VFD to record every minute of active power, power factor, current, voltage, and...
Jraef thank you for that straight clear explanation how to use a PID control for the VFD running a centrifugal pump,
"Energy savings is something that will the RESULT of using a PID controlled VFD on a centrifugal pump" That is clear because
a centrifugal pump follows the affinity law, the...
Thank you 3DDave for your promtly reply.
When the juice has a higher-grade Brix the pump does more effort to transport it. The centrifuge pump is part of a concentration System. The idea I think, if I am not wrong, it is to work with a torque sensor in such a way that when the juice liquid is...
Dear engineers
I have a customer that is using a Siemens VFD manually to operate a centrifugal pump that transports juice with different Brix grade and the only reason he is using the VFD is for the start of the pump and is not getting a benefit of the affinity law to save energy running the...
Gr8blu,
thank you for your technical comments. For your information, it is a part winding start operation with 2 contactors and 2 thermic over current protection and the delay time unit. We will follow your advice and confirm that each motor draws about the same current value before we increase...
waross and itsmoked ,
you have been very helpful with your final advice. Very kind especially on weekend days!
We will do it that way. Hopefully, customer will increase the daily ice production.
Thanks again for your helpfulness .
Best regards
Thank you waross and itsmoked for your answers. Now to your questions :
1.- It is a Bitzer , german brand, a semi-hermetic reciprocating motor compressor .
2.- It is an ice machine.
3.- Yeah only 110 amperes total for the 3 units of the ice machine but as I wrote before it stops because of an...
itsmoked , thank you for the recommendation to work with the overcurrent protective device and set it to 65.5 instead of the phase voltage protective device. Just for the record enclosed is the behavior of the current of 3 motors in the same time range. The machine has 3 compressors, each draws...
thank you Jraef for your comments. this motor drives a refrigeration compressor and the voltage input from the electrical company is not stable. See the Screenshot enclosed. We have to calibrate the tap from the power transformer to lower in 2,5 % the incoming voltage because otherwise, the...
Thank you Waross for your prompt answer. Enclosed is the plate of the motor.
https://files.engineering.com/getfile.aspx?folder=761f3399-3f22-4063-adce-83ef2afaf717&file=PLACA_DE_MOTOR_DE_COMPRESOR.jpeg
