Cla-Val 390-07/3690-07 - Manual (Page 26)

Alarms
The actuator has a Low and High Alarm with an adjustable hysteresis and is activated as shown in the lower window:
Example: 10% Löw alarm = 4 mA + (10% x 16 mA) = 5.6 mA. 90% High alarm = 4mA + (90% x 16 mA) = 18.4 mA.
Hysteresis
1 Hysteresis prevents chattering of the alarms when the set point is very close to the alarm status. It is calculated as follows:
4 mA + (2% x 16 mA) = 0.32 mA. Low alarm hysteresis therefore equals 5.6 mA + 0.32 mA = 5.92 mA. High alarm
hysteresis equals 18.4 mA - 0.32 mA = 18.08 mA.
2 Enter the requested percentage, for the alarms and hysteresis.
3 Click on "Test" to close or open your contact relay.
4 Click on "Write Alarms" button to complete.
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