Updated – December 29, 2022
In order to selectively switch off power consumers when the voltage falls below a minimum, a Homematic DIN rail switching actuator with power measurement is required.
- Homematic DIN rail switching actuator with power measurement HM-ES-PMSw1-DR
The Dometic refrigerators give an acoustic warning signal when the AC supply voltage drops from the usual 230 V to below 195 V. This can be the case when using 25 or 50 m cable drums or a generally weak supply network. Larger consumers then quickly cause a voltage drop, which leads to the acoustic warning.
Dometic has kindly designed the refrigerator's circuit so that after disconnecting the 230 V supply voltage and reconnecting it, the refrigerator immediately resumes its 230 V operation.
Since in the above listed Performance measurement script HG_LM also the voltage across the variable Var_HG_LM_VOLTAGE
can be queried, simply inserting the following code into the elseif
-branches in the above script HM_LSS, by means of the top-hat rail switching actuator looped into the phase of the refrigerator HM-LC-Sw1-DRto turn the refrigerator on or off.
The code is:
! Refrigerator OFF
if (Var_HG_LM_VOLTAGE < 200)
{
dom.GetObject("BidCos-RF.SEQ3114635:1.STATE").State(0);
WriteLine("Refrigerator OFF");WriteLine(Var_HG_LM_VOLTAGE);
}