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???
11/14/06 22:45
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 		 #127996 - STP?
Responding to: ???'s previous message

Erik, the motors I assume we are talking about are induction motors since the use of AC variable speed drives. In this instance it is not the motors that are making the noise but the AC drive itself. Shielded cable to the motor is a must otherwise it will radiate like a radio transmitter.

Twisted pair cable is a must. RS485 is reasonably tolerant of many things, but not using twisted pair is inviting trouble. Using twisted pair is more important than the termination resistors!

Erik, what is the issue with using shielded twisted pair? I tend to use kilometres of the stuff.

List of 28 messages in thread
TopicAuthorDate
Requesting your suggestions on RS485            01/01/70 00:00      
   Sounds like an earthing problem            01/01/70 00:00      
      Sounds like an earthing problem >> Russell            01/01/70 00:00      
   Are the devices plugged in in an outlet with groun            01/01/70 00:00      
      Are the devices plugged >> Erik            01/01/70 00:00      
         motor noise            01/01/70 00:00      
   Some points            01/01/70 00:00      
       Some points >> Kai Klaas            01/01/70 00:00      
         DO, DO NOT            01/01/70 00:00      
            STP?            01/01/70 00:00      
               Better mounting close to the motor?            01/01/70 00:00      
                  Better close to the motor!            01/01/70 00:00      
               none, so do I            01/01/70 00:00      
               one final thought            01/01/70 00:00      
                  Nice methode!            01/01/70 00:00      
                     Mr. Ferrite lives here :)            01/01/70 00:00      
                        He is a SOFTY, I hope...            01/01/70 00:00      
                           not so soft - here are the hard facts            01/01/70 00:00      
                              Interesting, thanks!            01/01/70 00:00      
                                 closer to home            01/01/70 00:00      
                                    So you have to comply with CE standards...            01/01/70 00:00      
                                       totally diffrent technology            01/01/70 00:00      
         Cat5-cable            01/01/70 00:00      
         More details about used AC drives?            01/01/70 00:00      
   Thank you all members            01/01/70 00:00      
      Good luck!            01/01/70 00:00      
   Reporting From Site..Day1            01/01/70 00:00      
      against all my principles            01/01/70 00:00      

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