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???
11/14/06 19:02
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 		 #127984 - Sounds like an earthing problem >> Russell
Responding to: ???'s previous message
Hi Russell Bull,
Many thanks for your suggestions.


If you only connect one variable speed drive, play around with the different possibilities of the RS485 shield to earth or to ground.


At that time I had connected all the 4 AC Drives at the same time. But I did not try by connecting only one ac drive. I will try that and will also work with the possibilities of GND and Earth.


Is the cable from the VSD to the motor shielded? And properly earthed?


I am Not Sure I checked this, But I will ensure that it is properly connected to earth.



Is there any change when you remove the 100R resistor (in many cases this is not necessary of the data rate is low and/or the cable length is short).

I did test this accidently once, and the communication worked well. But for the sake of reliability, I placed the terminating resistors at both the ends of the cable. The Data Rate is 9600.
The Total cable Length is about 15~20 meters long.

Thanks again,
From Kiran V Sutar


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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