The threshold gate serves as control for aggregates, pumps, fans, burners etc.
An analogue control signal between 0 and 10 V is used for operation. In the automatic mode ("Auto") the relay is activated as soon as the input voltage reaches the threshold. If the input voltage falls below the turn-off threshold the relay drops off.
The device is provided with a manual control facility with checkback function for servicing purposes.
The module offers two operation modes, they are set by the three-position switch (Auto, 0, 1). Turn-on threshold and hysteresis setting is done with rotary switches.
1. Switch position "1":
The output relay is controlled by contacts A1 and A2.
2. Switch position "0":
The relay is switched off (bridge over contacts 11 and 12)
3. Switch position "Auto":
The output relay is controlled by the voltage at input YR. Voltage has to be continuously applied at contact A1