Relay behavior not as expected

Using the relay output on the Phoenix Smart 50A (1+1) charger. Latest firmware installed.
I have set the relay up as ALARM, with a low trigger of 13.1V, and no delays.
Expected behavior:

  • At >13.1V, the relay will be open
  • At <13.1V, the relay will be closed
    Settings:

Result:
At 13.30V, the relay is closed! It should be open

At <13.1V the relay does remain closed… but it should have changed state

Any ideas? Thank you!

The relay does not open until 15.4V, look at your setting to see the icon with the alarm bell crossed out. This is called hysteresis, you have a slightly different reset condition so if you are fluctuating at 13.1V your alarm does not keep going on and off.

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Thank you very much! That solved my issue - really appreciate your help :slight_smile:

Normally you would have low alarm at 13.1V and reset at say 13.4V

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