RLY02 - strange behaviour

[Nick Locke]

This is all Comfort 1. 

I have three RLY02 boards, connected via twelve core cables to:

• SEM (17-24)
  
• LEM (25-32)
  
• SEM (33-40)

All 24 outputs are working as expected.  However, I have noticed that the LEDs on the RLY02 connected to the first SEM (outputs 17-24) glow dimly all of the time.  This seems to suggest that, although things are working, something is not quite right.

I have checked the connections and everything seems to be ok.  Clues welcome on what kind of fault is likely to cause this behaviour.

Thanks.

[slychiu]

This may happen if you have any load connected between the Slave Output and Common (Ground)

The Comfort/Slave Output should be connected to OP op of the RLY01 and the Output centre pin to C

This may also happen if you are using an  external voltage to drive the Realy coil, which is higher than the Comfort 12V. You can try connecting a 1 K resistor between OP and C of the RLY02 for each relay