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Hekne
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Joined: 19-September 08
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Last Seen: 19th September 2008 - 07:53 AM
Local Time: Sep 3 2010, 07:16 PM
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19 Sep 2008
Hello!
Just slipped into this forum when searching for soft starter manufactuers in google. Seems to be people here with great knowledge why I try to post a question. I work as a development engineer for a small swedish heat pump manufactuer and due to a german regulation we've encountered a big problem regarding starting current for our compressors. We have a potential customer in Germany for a bigger heat pump with a compressor with locked rotor current 101A. The mentioned regulation says that maximum starting current should not exceed 30A. With the soft starters we use today we cannot reduce starting current more than 40-45%, i.e starting current 55-60A. We've therefore looked to AC-drives where we can reduce the start current to about 1,5 times the rated current, in this case 14A. This solution is though very expensive and we cannot use all the benefits with an AC-drive as the compressor design doesn't allow AC controlling. I.e. we buy a expensive AC-drive just for soft starting the compressor and after that just pass the current through it. Does anyone know any other soft starting technology which can reduce the start current in a better way? /Henrik |
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Lo-Fi Version | Time is now: 3rd September 2010 - 05:16 PM |
