SIRIUS 3RR2 current monitoring relays
8.8 Operation
SIRIUS Innovations
718 System Manual, 01/2011, A8E56203870002-03
8.8.2.4 Settings in the "SET" menu
Hysteresis
Definition of hysteresis (Hyst)
Hysteresis is the lagging of an effect behind its cause; its purpose is to prevent repeated
response in the threshold value range.
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Figure 8-4 Explanation of hysteresis
Hysteresis
If, after the upper threshold value has been overshot to such an extent that switching was
necessary, the current returns to the normal range, switching over to the correct range will
not take place until a current which undershoots the hysteresis threshold has been reached.
The same applies if the lower threshold value is undershot.
Setting range
The setting range for the hysteresis threshold is 0.1 to 3 A (3RR2241-.F.30)/0.1 to 8.0 A
(3RR2242-.F.30) of the relevant lower and upper threshold setting with an increment of
0.1 A.
Factory setting
The hysteresis value is factory-set to 0.5 A (3RR2241-.F.30)/0.8 A (3RR2242-.F.30).
Changes to settings
Changes to the hysteresis threshold can be made using the arrow keys. Press and hold
down the keys to speed up this process.
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