
3UG4.1 line monitoring relay
6.4 3UG4513 line monitoring relay
3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004
125
6.4.4
Diagnostics
6.4.4.1
Diagnostics with LED
Status display
The following information about the operating state is displayed on the 3UG4513 line
monitoring relays:
Operating status
LED
State of the output
relays
Coil symbol (green) Phase failure / phase
sequence (red)
12/ 11/ 14
22/ 21/ 24
•
Supply voltage not present Off
Off
•
Supply voltage present
•
Correct phase sequence
•
All phases available
•
Line-to-line voltage OK
On
Off
•
Supply voltage present
•
Incorrect phase sequence
On
flashing
•
Supply voltage present
•
Phase failure
On
On
•
Supply voltage present
•
Line-to-line voltage
undershot
On
On
You will find more information about the switching behavior of the output relays in Chapter