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Problem: MM440 + Profibus + external 24VDC

Created by: aitorurteaga at: 6/20/2012 11:54 AM (5 Replies)

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6 Entries

6/20/2012 11:54 AM	Rate (0)
aitorurteaga Posts: 6 Rating: (0)	Hi all, We have a MM440 with a Profibus module. We also have a external 24VDC source, because we want comms keep running even when the drive is not feeded. When the contactor is opened, the LED is green until the DC bus goes to 0V. Then, the LED first turns orange and after a second it goes red. When we turn to feed the drive, the LED goes green again and comms are restored. We have more drives with the same configuration and don't have any problem. Can anyone help me? Thanks all
aitorurteaga Posts: 6 Rating: (0)
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6/20/2012 5:48 PM	Rate (2)
Graeme Platinum Expert Joined: 6/4/2008 Last visit: 11/25/2025 Posts: 1521 Rating: (327)	aitorurteaga Hi all, We have a MM440 with a Profibus module. We also have a external 24VDC source, because we want comms keep running even when the drive is not feeded. When the contactor is opened, the LED is green until the DC bus goes to 0V. Then, the LED first turns orange and after a second it goes red. When we turn to feed the drive, the LED goes green again and comms are restored. We have more drives with the same configuration and don't have any problem. Hi, I have seen this before, it was due to a badly fitted Profibus module. The external 24VDC is not only powering the Profibus module, but it is also fed to the drive for the CPU (Parameters). If this connection is not 100%, then the Profibus module cannot access the CPU and comms is halted (Orange then Red) Check the connections (which are very fragile) or try another Profibus module. If these are both ok, you could try exchanging an interface module. Regards, Graeme

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This contribution was helpful to 1 thankful Users aitorurteaga

6/22/2012 8:55 AM	Rate (0)
aitorurteaga Posts: 6 Rating: (0)	First of all, thank you, Sorry but i'm quite new and i don't understand what you mean with "exchanging interface module". Thanks a lot again!! Aitor Urteaga
aitorurteaga Posts: 6 Rating: (0)	Last edited by: aitorurteaga at: 6/22/2012 8:56 AM
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6/23/2012 1:25 PM	Rate (1)
Vithani Platinum Expert Joined: 7/8/2009 Last visit: 6/7/2025 Posts: 1977 Rating: (479)	aitorurteaga First of all, thank you, Sorry but i'm quite new and i don't understand what you mean with "exchanging interface module". Thanks a lot again!! Aitor Urteaga I guess he means I/O Module of MM440 Please look at attachment for how to remove it And also refer Manuals as you are new to drives, that will help you lot Operating Instructions: MICROMASTER 440 0,12 kW - 250 kW Parameter List: MICROMASTER 440 Regards, Devesh Vithani Attachment 440_OPI_24294529_en_1006.JPG (273 Downloads)
	I dont Like people driving Fast, thats the reason I overtake them ;)
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This contribution was helpful to 1 thankful Users aitorurteaga

6/25/2012 3:02 PM	Rate (0)
aitorurteaga Posts: 6 Rating: (0)	Another thing we can see is that the BOP turns "----" and we can't see any parameter. I'm going to try to exchange the I/O module. I'll tell you... Thank a lot!!!!
aitorurteaga Posts: 6 Rating: (0)
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6/29/2012 10:33 AM	Rate (0)
aitorurteaga Posts: 6 Rating: (0)	Thanks a lot mates!!! We could solve the problem. The problem was that a couple of pins of the I/O module were bend, so the external power supply didn't reach the CPU so comms fell down and so the red led was turned on. I attached the file I found in the Siemens webpage and helped me. I'm sure I couldn't have solved this without your help. You told me that the problem could probably be on the I/O module, and the "-----" told me that the problem could be in bended pins. And finally the problem was just the conbination Many thanks!!! Attachment The display on my BOP shows - - - - -. What could cause this.pdf (266 Downloads)
aitorurteaga Posts: 6 Rating: (0)
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This contribution was helpful to 2 thankful Users Graeme O_Moderator

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