3RR2 current monitoring relays
4.5 3RR22 current monitoring relays
3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004
77
4.5.4
Diagnostics
Display information
The display is divided into three different areas.
①
Current measured value or fault symbol
②
Type of monitoring
③
Symbols for the semiconductor contact (left) and the CO contact (right)
Meaning of the information on the display
Note
Indications in the event of a fault
The symbols on the display flash to indicate an error.
The following statuses and faults are indicated on the display as a diagnostics message with
flashing symbols:
Display area Symbol
Meaning
①
12.5A
Displays the measured current
①
n x
I▲
Flashing: Current is above the set blocking current
①
I>>
Flashing: Fault current detected
①
L
Flashing: Cable break/phase failure detected
①
Flashing: Incorrect phase sequence detected
②
Monitoring for current overshoot
②
Monitoring for current undershoot
②
Range monitoring (monitoring for current overshoot and current
undershoot)
②
Current is in correct range
②
A current overshoot has occurred
②
A current undershoot has occurred
③
•
Not flashing: Relay contact 31/32 open, relay contact 31/34 closed
•
Flashing: Delay time (ON-delay or tripping delay) running
•
Masked out: Relay contact 31/32 closed, relay contact 31/34 open
③
Q
•
Not flashing: Semiconductor output closed, supply voltage connected
•
Flashing: Delay time (ON-delay or tripping delay) running
•
Masked out: Semiconductor output open, supply voltage not
switched through
You will find more information about the switching behavior of the output relays in Chapter "Function (Page 71)".