SIRIUS 3RR2 current monitoring relays
8.8 Operation
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
717
Upper threshold value
Definition of upper threshold value (I▲)
Setting the threshold value for current overshoot for the CO contact (I▲) or the
semiconductor output (I!▲). If one of the monitored parameters overshoots this threshold
value, 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 upper threshold value is 1.6 A to 16 A (3RR2241) or 4 A to 40 A
(3RR2242) as well as OFF. The increment is 0.1 A.
Note
Setting OFF selects "Current undershoot" monitoring mode, see the chapter titled Lower
threshold val
ue (Page 716).
Factory setting
The upper threshold value is factory-set to 3.0 A (3RR2241-.F.30)/8.0 A (3RR2242-.F.30).
Changes to settings
Changes to the upper 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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