Ofs Softening Control, Инструкция по эксплуатации, Страница: 13 / 28

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9.3.4 External signalling by potential free contact
The external threshold value excess alarm and the brine alarm are connected to terminals 1/2-
3, and the external service alarm is connected to terminals 4/5-6.
The service alarm is a summery alarm, which can be caused by:
-
low sensor performance
- there is no electrical contact to the sensor
- valves do not work properly.
It is indicated by flashing LEDs, which of the above failure caused the service alarm (see also
chapter “Explanation of LED-status for displaying of functional status” and “Malfunctions
and possible causes”).
The following external electrical requirements must absolutely be fulfilled:
External requirements: maximum connection voltage 24 Volt
maximum current 0.5 Ampere
Contact positions in voltage-free positions:
The logical behavior is shown in the following table:
Signal status Terminals
Contact
state
Power cut or threshold value exceeding or brine inrush 1/3 closed
Power cut or threshold value exceeding or brine inrush 1/2 open
Power cut or service alarm 4/6 closed
Power cut or service alarm 4/5 open
1 3 2
Switch setting
Threshold value exceeding
or brine solution alarm
4 6 5
Switch setting
service alarm