SIRIUS 3RR2 current monitoring relays
8.8 Operation
SIRIUS Innovations
716 System Manual, 01/2011, A8E56203870002-03
8.8.2.3 Settings in the "RUN" menu
Lower threshold value
Definition of lower threshold value (I▼)
Setting the threshold value for current undershoot for the CO contact (I▼) or the
semiconductor output (I!▼). If one of the monitored parameters undershoots these threshold
values, the current monitoring relay will switch the output relay or the semiconductor output
once the set tripping delay time (Del, see the chapter titled Tripping delay time (Page 720))
has el
ap
sed.
Setting range
The setting range for the lower threshold value is OFF as well as 1.6 A to 16 A (3RR2241) or
4 A to 40 A (3RR2242). The increment is 0.1 A.
Note
Setting OFF selects "Current overshoot" monitoring mode, see the chapter titled Upper
threshold val
ue (Page 717).
Factory setting
The lower threshold value is factory-set to 1.6 A (3RR2241-.F.30)/4.0 A (3RR2242-.F.30).
Changes to settings
Changes to the lower threshold value can be made using the arrow keys. Press and hold
down the keys to speed up this process.
NOTICE
Deactivating monitoring
If both threshold values are deactivated (OFF), monitoring will cease.
Current overshoot
Current undershoot
Blocking current
The following parameters continue to be monitored:
Fault current (if activated)
Incorrect phase sequence (if activated)
Phase failure
The up-to-date measured value is displayed permanently.
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