3UG458. insulation monitoring relay
9.3 3UG4581 insulation monitoring relay
3UG4 / 3RR2 monitoring relays
226
Manual, 05/2016, NEB927043002000/RS-AC/004
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)
Off
Off
No fault
Off
Insulation fault (threshold undershot)
Off
System leakage capacitance too high at
device startup
Off
Measuring result invalid
Off
Internal fault
Off
Off
Test function active
Off
Off
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 219)".