Diagnostics; Circuit Diagrams - Siemens SIRIUS 3UG4 Equipment Manual

The parameters are described in the Chapter "Parameters (Page 281)".
Required tools
The same screwdriver can be used to set the parameters as for mounting the current monitoring
relays.
4.4.4

Diagnostics

Status display
On the current monitoring relay with analog setting, two status LEDs indicate the operating
state:
• FAULT (red)
• READY (green)
Display
FAULT off
FAULT steady on
FAULT flashes at 1 Hz
FAULT flashes at 4 Hz
READY off
READY on
You can find more information about the LED display response in the Chapter "Function
(Page 56)."
4.4.5

Circuit diagrams

Internal circuit diagrams 3RR21
3RR2141-1A.30 current monitoring relay
Figure 4-2
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005
Meaning
Measured value is within range limits
Device has tripped
Delay time is running
Cable break/phase failure detected
Voltage is not applied at B1 - B2
Voltage is applied at B1 - B2
1 CO contact, 2-phase
3RR2 current monitoring relays
4.4 3RR21 current monitoring relays
59