User Manual

3UG4.1 line monitoring relay
6.4 3UG4513 line monitoring relay
3UG4 / 3RR2 monitoring relays
Manual, 02/2013, NEB927043002000/RS-AA/002
111
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:
LED State of the output
relays
Operating status
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
"Function (Page 108)."