SEAV LRX-2186: gate opens a bit then stops

[mehsom]

Hi all,
I’ve got a 2-leaf swing gate running on a SEAV LRX-2186 controller (230V motors). Since the colder weather started I’m seeing a strange problem and I’d really appreciate some pointers before I decide whether to replace the board.
Symptom

• In the morning, when I send an OPEN command:
  • First leaf starts to open a little, then stops.
    
  • Sometimes it will try again, move a bit more, and stop again.
    
• Around 09:00 and later in the day the problem is mostly gone and the gate behaves normally.
  
• This started only recently; it used to work fine.
  

What I’ve tested so far

1. Photocell / safety bypass
   • On CN2 I bridged terminals 8–9–10 (as per manual) so the photocell/safety input is disabled.
     
   • I removed power from the photocell completely.
     
   • I also disconnected power from an RTU5024 GSM unit I had connected, so right now it’s literally just:
     • LRS-2150 controller
       
     • Motors
       
     • Mains supply
       
   • Issue STILL happens in this “bare” configuration.
     
2. Motor output voltage
   • When the gate starts moving normally I measure about 230 V AC on the motor output terminals.
     
   • When it does the “opens a bit then stops” thing and gets stuck mid-open, I measure only ~2–3 V AC on the motor output.
     
   • So it looks like the controller is cutting power to the motor completely (2–3 V looks like leakage, not real power).
     
3. Reset and learning
   • I did a full reset / re-learning procedure from the manual.
     
   • During the learn cycle the controller drives the motors through the full travel and that process completes successfully.
     
   • After learning is done, when I send a normal OPEN command, the old problem comes back: gate starts, moves a little, then stops and I see ~2–3 V at the motor output.
     
4. Photocell definitely not the cause
   • Because 8–9–10 are bridged, photocell has no power, and RTU is disconnected, I’m assuming the controller is not seeing a safety input any more.
     
   • The behaviour is exactly the same with or without the photocell connected.
     

What I suspect
Because:

• Motors can clearly move the gate during learning,
  
• Problem persists with all external stuff removed,
  
• Voltage at the motor output is cut by the board when it stops,
  

…I’m leaning towards an internal controller issue, maybe:

• Current-sense circuit or force-limit circuit thinking there is an overcurrent/obstacle and shutting the triac off,
  
• Low-voltage PSU / electrolytic capacitors sagging under load (worse when cold),
  
• Some weird parameter or EEPROM corruption where normal mode is applying a much stricter limit than the learn cycle.
  

Questions

1. Does this failure pattern sound familiar on LRX-2186 boards?
   
2. Are there known weak components on this board (e.g. PSU caps, shunt resistor, triacs) that typically cause:
   • learn OK,
     
   • normal run stops almost immediately?
     
3. From your experience, is it worth asking an electronics tech to recap / repair the board, or is it usually more economical to just fit a replacement board (LRX-2186 New / similar)?
   

i attached a picture 

Manual: https://www.manualslib.com/manual/157729...-2186.html

Thanks in advance for any help or hints!

[OMH]

Hi,

How old is the setup?

I had a similar problem and changing the capacitor has made a huge difference.

Yours looks like an 8 micro farad. £6 on amazon.

Not saying it will work, but for £6 may be worth a try?

[Aiden Mitton]

Hi,

The SEAV systems are not one which we work with however I have seen faults similar to this on other control panels. 

From what you have described I would think that this could be a control panel however, I would try both motors on their own and see whether the same issue occurs on both, I would try swapping the motors when both are wired in to see whether the same issue occurs but on the second motor. If this is the case, it does look like a motor output issue. It may also be worth powering the system down and checking the front and back of the PCB for any damage, especially around the motor outputs.

I do not think this would be a capacitor issue because if it was, the motors would not be moving when you do the position learn. You would also find the motors would just hum and not move.

I hope this was useful.

Many Thanks,

Aiden.