Siemens 3UG4 - Diagnostics; Diagnostics with LED

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
"Function (Page 122)."