User Manual

3RR2 current monitoring relays
4.4 3RR21 current monitoring relays
3UG4 / 3RR2 monitoring relays
Manual, 02/2013, NEB927043002000/RS-AA/002
49
4.4.3 Operation
Parameters
The following parameters can be set on the relevant rotary button using a screwdriver:
Table 4- 6 Parameter information, 3RR21 current monitoring relays with analog setting
Setting range
Parameters Control
element
4)
Minimum value Maximum value
Increment Factory
setting
ON-delay time (onDel) 9 0 s 60 s Continuous 0 s
Tripping delay time (Del) 10 0 s 30 s Continuous 0 s
Threshold for current overshoot (I▲) 2 1.6 A or OFF
1)
4 A or OFF
2)
16 A or OFF
1)
40 A or OFF
2)
Continuous 8 A
1)
20 A
2)
Threshold for current undershoot(I▼) 3 1.6 A or OFF
1)
4 A or OFF
2)
16 A or OFF
1)
40 A or OFF
2)
Continuous Disabled
Reset response (Memory) 4 0 = automatic
rest
1 = manual reset
3)
-- Automatic
reset
1)
current monitoring relay 3RR2141-.A.30
2)
current monitoring relay 3RR2142-.A.30
3)
a stored fault condition can be reset by briefly switching to Memory = 0 or by switching off
the supply voltage.
4)
The position digits refer to the front view in Chapter "Operator controls and connection
terminals (Page 46)."
Hysteresis
The hysteresis is set to a fixed value of 6.25% of the set threshold.
Changes to settings of threshold for current overshoot (I▲) and threshold for current undershoot (I▼)
Note
Deactivating monitoring
If both threshold values are deactivated (OFF), the following will no longer be monitored:
• Current overshoot
• Current undershoot
The following parameters continue to be monitored:
• Phase failure
The parameters are described in Chapter "Parameters (Page 351)."