I have a VSD that has suffered many problems basically it cannot handle the sometimes large upset currents from the load (rapid changes in load conditions) Recently I had a very knowledgeable gentlemen visit me. He says that perhaps we can reduce the effect of some of the problems through the...
Thank You to all who have submitted comments etc. I appreciate it. To DickDV I have found out the information that you said I should submit (kva). This comment put me on a path and now I think I can work it out. Can you tell me if I am on the right path or not?
Motor = (250kW 400VAC 50hz 440A...
I must thank DickDV , skogsgurra and Marke for their input However this still leaves me in the dark.
I have a reciprocating refrigeration compressor which in normal operation at 1480rpm would absorb about 258kW calculating that out using Amps =
This equates to 455amps. Which is borderline for...
So I have a reciprocating refrigeration compressor that is attached to a 250kW motor. For various reasons it has been decided that the compressor should no longer be run at 1480rpm and that it should be stepped down to 1000rpm. For various reasons I ended up with a drive which I believe is too...
I have a book which says that because of its structure the IGBT cannot be reliably tested with an ohmmeter and basically refer it to a qualified field service technician however there are none of those here where I live in the first world so I looked further and found this at...
Thanks Mark that is the feedback that I need. My application is a refrigeration-reciprocating compressor, which by it’s nature does not have a perfectly constant torque characteristic, on top of this we have a habit of unloading cylinders as need be. This leads to sudden increases/decreases in...
I have a 2 VSD’s which are Leroy Somer UMV3301’s They are described in the literature as being ‘Open or Closed Loop Flux Vector Controller’ Simply what is the difference between Open and Closed? What are the implications of running the drives in V/f ratio mode? The drives have been set up by the...
I have a 250kW motor connected to a process. The process will only use about 180kW absorbed power. I have a 200kW Variable Speed Drive which I want use to control this motor. Can I successfully pull this off. If so what of the various motor data that is needed by the VSD will I have to alter for...
