Siemens 3UG4 - Operation

3RR2 current monitoring relays
4.4 3RR21 current monitoring relays
3UG4 / 3RR2 monitoring relays
56 Manual, 05/2016, NEB927043002000/RS-AC/004
4.4.3
Operation
Parameters
The following parameters can be set on the relevant rotary button using a screwdriver:
Table 4- 7 Parameter information, 3RR21 current monitoring relays with analog setting
Parameters
Control
element
5)
Setting range
Increment
Factory
setting
Minimum value
Maximum value
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)
8 A or OFF
3)
16 A
1)
40 A
2)
80 A
3)
Continuous 8 A
1)
20 A
2)
40 A
3)
Threshold for current undershoot
(I▼)
3 1.6 A or OFF
1)
4 A or OFF
2)
8 A or OFF
3
)
16 A
1)
40 A
2)
80 A
3
)
Continuous Disabled
Reset response (Memory) 4 0 = automatic rest 1 = manual reset
4)
-- Automatic
reset
1)
current monitoring relay 3RR2141-.A.30
2)
current monitoring relay 3RR2142-.A.30
3)
current monitoring relay 3RR2143-.A.30
4)
a stored fault condition can be reset by briefly switching to Memory = 0 or by switching off
the supply voltage.
5)
The position digits refer to the front view in the Chapter "Operator controls and connection
terminals (Page 53)."
Hysteresis
The hysteresis is set to a fixed value of 6.25% of the set threshold.