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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

ScottyUK; That really makes sense. I checked it out, the customer set the current limit value at 318A exactly. Is it safe if it is set to let say 10% higher than nameplate? Thanks Keith

Rodym; But the current reading shows around 260A while the limit (motor name plate) is 318A. Keith

sparkysb Thanks. hmm....yes, I am monitoring the current as well. Extra 3 Hz for a 4-pole motor is about 9 rpm extra??? Keith

Sparkysb; of course the setting is already 50Hz for maximum frequency. In fact, I was thinking of changing the makx frequency setting to 55hz so that it can reach 50hz in reality??? But is it dangerous for the motor? Motor spec is 380V, 50Hz. One information though, the incoming power supply...

Hi All; I am using FC202-200kW to run a centrifuge pump (distribution pump). Since I only make use of the soft start and soft stop, I run the inverter in Hand mode and press the '+' button to reach 50Hz output. But the display show that the maximum is 47Hz and status is RAMPING, not RUNNING...