Siemens 3UG4 - Diagnostics; Diagnostics with LED

3UG4.1 line monitoring relay
6.3 3UG4512 line monitoring relay
3UG4 / 3RR2 monitoring relays
114 Manual, 05/2016, NEB927043002000/RS-AC/004
6.3.3
Diagnostics
6.3.3.1
Diagnostics with LED
Status display
The following information about the operating state is displayed on the 3UG4512 line
monitoring relay:
Operating state
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
On Off
• Supply voltage present
• Incorrect phase sequence
On flashing
• Supply voltage present
• Phase failure
On On
You will find more information about the switching behavior of the output relays in Chapter
"Function (Page 112)".