Skip to Content

Register Login

Industry Online Support

Technical Forum

Navigation

LOGO relay outputs not working

Created by: pr.falken at: 10/11/2021 5:08 PM (6 Replies)

Rating (2)

Thanks 2

7 Entries

10/11/2021 5:08 PM	Rate (0)
pr.falken Member Joined: 10/8/2021 Last visit: 10/12/2021 Posts: 4 Rating: (0)	Hi! First of all I apologise in advance if this is not the place to write this post... I'm new to this forum... This year, I started studies in industrial automation, and I was given and old LOGO! to tinker with, the model being 230RL 6ED1053-1FA00-0BA0, lanched in the late 1990s (1996 - 1998 ?). While testing it, I noticed that the relays of outputs 1 through 4 didn't "kick in" even though the LOGO screen said that these outputs were activated. These outputs either do not work at all or they barely work very sporadically when the logo is moved, as if there was some sort of bad contact which prevented the relay coils to get the 24V they need to make the commutation. The thing is I can't trace it... Also relays from Q5 to Q8 seem to work fine though. Thank you so much in advance :)
	Last edited by: pr.falken at: 10/11/2021 17:09:13 Last edited by: pr.falken at: 10/11/2021 17:09:25
Suggestion To thank Quote Answer

10/11/2021 5:11 PM	Rate (1)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 6/27/2022 Posts: 27200 Rating: (3300)	And what exactly is your question now?

Suggestion To thank Quote Answer

10/11/2021 5:14 PM	Rate (0)
pr.falken Member Joined: 10/8/2021 Last visit: 10/12/2021 Posts: 4 Rating: (0)	I was wondering if anyone had had this problem and what component could be causing this problem.

Suggestion To thank Quote Answer

10/11/2021 5:42 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 6/27/2022 Posts: 27200 Rating: (3300)	This PLC is approx 25 years old. Are you sure that the relays not switching or switch the relays but the contacts don't close?

Suggestion To thank Quote Answer

10/11/2021 5:46 PM	Rate (0)
pr.falken Member Joined: 10/8/2021 Last visit: 10/12/2021 Posts: 4 Rating: (0)	Thanks for the reply! I think it is the relays not switching, I couldn't see any voltage on the coils... Yes it is quite old indeed! At school we work with S7-1200s and with the new LOGOs, they are much better of course, worlds apart from this LOGO!
	Last edited by: pr.falken at: 10/11/2021 17:50:27 Last edited by: pr.falken at: 10/11/2021 17:51:21
Suggestion To thank Quote Answer

10/11/2021 5:56 PM	Rate (1)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 6/27/2022 Posts: 27200 Rating: (3300)	The relays contants are are not intern connect to the voltage, the contacts are potential-free. Example: You want switch a 24 VDC lamp. Then must you connect the +24 VDC to the terminal 1 of the relay output. Terminal 2 must connect to one side of the lamp, the other side from the lamp must connected to 0 VDC (or M).

Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users pr.falken

10/12/2021 10:29 AM	Rate (0)
pr.falken Member Joined: 10/8/2021 Last visit: 10/12/2021 Posts: 4 Rating: (0)	Yes, what I did, was opening the LOGO and, while running I checked if the internal coils of the relays were receiving voltage, if they were being energised. It seems that, for the relay to switch, the relay coil needs to receive 24V, I think (don't know for sure...) that, when the processor IC gives the order to activate the relay, it activates a transistor or something which, in turn, gives 24V to the relay coil, which, in turn switches the contacts. The thing is I can't find the 24V anywhere on relay coils 1-4, even though I found the 24V on relay coils 5-8. Again thanks so much for all the help :)

Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users ixo65

|

Share this page:

Share this page on...

Related topics by keywords:

Follow us on