Figure 9-1 Remote test button
9.3.4 Diagnostics
9.3.4.1 Diagnostics with LEDs
Status display
The following information indicates the operating state on the 3UG4581 insulation monitoring
relays:
Operating state LED (green) LED F (red) LED (yellow)
Self-test (after U
S
= on) O O
No fault O
Insulation fault (thresh‐
old undershot)
O
System leakage capaci‐
tance too high at device
startup
O
Measuring result invalid
O
Internal fault
O O
Test function active
O O
Manual RESET possible
1)
2)
1)
The device has tripped following an insulation fault. The fault has been stored and the insulation
resistance has reverted to a value above the set threshold including hysteresis.
2)
Dependent on the fault.
The switching behavior of the output relay is shown in Chapter "Functions (Page 159)".
3UG458. insulation monitoring relay.
9.3 3UG4581 insulation monitoring relay
SIRIUS 3UG4 / 3RR2 monitoring relay
164 Equipment Manual, 07/2021, NEB927043002000/RS-AD/005
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