Recent content by Keith1976

Dear All; I am supervising 2 sites within one factory. Site A: There are 5 compressors running with ABB inverters. The inverters have modbus RTU built-in. They are monitored and controlled by HC900 via modbus RTU communication. Site B: There are 2 compressors (stand-by) operating with Danfoss...

Thanks SHozza

Marke; Can I replace "similar external hydraulic effects" with "similar suction & discharge pressure"? Keith

GGOSS; Thanks for sharing. To be precise, does it mean that the pump should stop under the same flowrate, suction pressure, and discharge pressure? (of course with 'certain' amount of tolerance). I hope you don't have to shoot me for answering this one.....:) Keith

Hi GGOSS Could you please tell me more about your experience? What system did you face? What kind of inconsistency? Thanks in advance. Keith

Marke; Yup...agree Keith

Hi Bill; how to ramp the speed down "nicely" until the check valve closes? Its a softstarter. I dont get you. keith

Marke; Yes, we used analog one that time to prove it to the motor vendor. May be that is also the reason why it keeps showing RAMPING instead of RUNNING Keith

Hi Marke; You got it wrong. I make use the motorized valve AGAIN after all the failure to get soft stop. When I test-com, all the valves are let open. The reason I shut the valve first is to rest the check valve so that there will be no shut slam noise. To customer, no noise means no water...

Ozmosis; Thanks. I always do AMA at least once when I test-com an inverter. But after that I do not do it anymore unless I press manual-initialization to return to factory setting Edison123; The vendor who supplied the motor came in and notice that his men did not do perfect aligning. So they...

Hi All; Thanks for the advice. The problem solved. It turned out that the motor-pump coupling is not properly installed. Hmm....then this must be a good feature of Danfoss inverter. Keith

Hi Jraef; Thanks for the input. I forgot to inform you that in my proposal, I told the customer that the motorized valve will no longer be needed. And during test-com, we let the valves open all the time. At the moment, I still make use of the valve. I close the valve first before stopping...

Hi Jraef and Ozmosis; The application is for distribution pumps with 3 pumps (@ 75kW). Each discharge line has a motorized valve and check valve. The pumps were run by star-delta starters in the past that is why they need the motorized valves. So this is a retrofit project. Two pumps are...

Hi All; Does anyone have experience using the above softstarter? The marketing article said that it has learning capability to have smooth stop. Keith

Itsmoked; I reset the inverter to factory setting already. Then enter the "principle" setting only, i.e. motor data. Keith