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 fail‐
ure / phase se‐
quence (red)
12/ 11/ 14
22/ 21/ 24
• Supply voltage not present
O O
• Supply voltage present
• Correct phase sequence
• All phases available
• Line-to-line voltage OK
On O
• Supply voltage present
• Incorrect phase sequence
On ashing
• Supply voltage present
• Phase failure
On On
• Supply voltage present
• Line-to-line voltage under‐
shot
On On
You will nd more information about the switching behavior of the output relays in Chapter
"Function (Page 92)."
3UG4.1 line monitoring relay
6.4 3UG4513 line monitoring relay
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 95
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