AB2005 Posted March 3, 2010 Report Share Posted March 3, 2010 Dear Friends, I have Nokian PF controller N-12 in PFI improvement plant in main distribution board which rating is 3500A currently supplying only 500-700A. Capacitors are connected in following sequence; • Stage 1 & 2 50KVA • Stage 3 - 6 100KVA • Stage 7-12 150KVA System had been working well but this time I have been facing a problem that Nokian PFC switches ON the stages step by step and when PF reaches at 0.95-98, it switches OFF the all stages and PF drops at 0.6-.7. PFC has been continuously repeating that sequence. Can any body help me out?. "Don't assume any thing, always check/ask and clear yourself". Link to comment Share on other sites More sharing options...
jraef Posted March 4, 2010 Report Share Posted March 4, 2010 Dear Friends, I have Nokian PF controller N-12 in PFI improvement plant in main distribution board which rating is 3500A currently supplying only 500-700A. Capacitors are connected in following sequence; • Stage 1 & 2 50KVA • Stage 3 - 6 100KVA • Stage 7-12 150KVA System had been working well but this time I have been facing a problem that Nokian PFC switches ON the stages step by step and when PF reaches at 0.95-98, it switches OFF the all stages and PF drops at 0.6-.7. PFC has been continuously repeating that sequence. Can any body help me out?. Sounds like a software glitch in the controller. Have you tried contacting Nokian? "He's not dead, he's just pinin' for the fjords!" Link to comment Share on other sites More sharing options...
AB2005 Posted March 5, 2010 Author Report Share Posted March 5, 2010 Sounds like a software glitch in the controller. Have you tried contacting Nokian? No. Now I send the mail to Nokian. "Don't assume any thing, always check/ask and clear yourself". Link to comment Share on other sites More sharing options...
Hanshuang Posted March 10, 2010 Report Share Posted March 10, 2010 Probably a protection founction of the controller been actived , such as harmonic over limit, especially the compensation without detuned recator. Link to comment Share on other sites More sharing options...
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