Upper Threshold Value - Siemens SIRIUS 3RT Series System Manual

SIRIUS 3RR2 current monitoring relays
8.8 Operation
8.8.1.3

Upper threshold value

Definition of upper threshold value (I▲)
Setting the threshold value for current overshoot If one of the monitored parameters
overshoots this threshold value, the current monitoring relay will disconnect once the set
tripping delay time (Del, see the chapter titled Tripping delay time (Page 708)) has elapsed.
Setting range
The setting range for the upper threshold value (I▲) is continuously 1.6 A to 16 A (3RR2141-
.A.30) or 4 A to 40 A (3RR2142-.A30) as well as OFF.
Note
Setting OFF selects "Current undershoot" monitoring mode, see the chapter titled Lower
threshold value (Page 705).
Factory setting
The factory setting for the upper threshold value is as follows:
● Size S00: 8 A
● Size S0: 20 A
Changes to settings
Changes to the upper threshold value can be made by adjusting the corresponding rotary
button (I) with a screwdriver.
NOTICE
Deactivating monitoring
If both threshold values are deactivated (OFF), monitoring will cease.
 Current overshoot
 Current undershoot
The following parameters continue to be monitored:
 Phase failure
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SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03