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 Meaning
FAULT o Measured value is within range limits
FAULT steady on Device has tripped
FAULT ashes at 1 Hz Delay time is running
FAULT ashes at 4 Hz Cable break/phase failure detected
READY o Voltage is not applied at B1 - B2
READY on Voltage is applied at B1 - B2
You can nd 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
///%$&'&
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Figure 4-2 1 CO contact, 2-phase
3RR2 current monitoring relays
4.4 3RR21 current monitoring relays
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 59
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