Light Emitting Diode (Led); Local Flag - Siemens 7SR45 Argus User Manual

2.6.3

Light Emitting Diode (LED)

2.6.3.1 Indication
The 7SR45 Argus relay consists of 9 non-programmable LEDs. LED indicates the operating status of the relay
such as TRIP READY and PICKUP.
The pre-defined LED functions are:
LEDs Predefined Names
LED 1
PROT. HEALTHY
LED 2
TRIP
LED 3
PICKUP
LED 4
IL1 / A
LED 5
IL2 / B
LED 6
IL3 / C
LED 7
IE / E
LED 8
TRIP READY
LED 9
LOW BATTERY
2.6.3.2 Protection Healthy LED
The steady illumination of Protection Healthy LED indicates that the required CT current 0.20xIn (minimum phase
current) in single phase or 0.10xIn (minimum phase current) in three phases or auxiliary power supply is applied
to the relay and the relay is functioning healthy.
2.6.3.3 Trip Ready LED
The steady illumination of Trip Ready LED indicates that required CT current 0.20xIn (minimum phase current)
in single phase or 0.10xIn (minimum phase current) in three phases or auxiliary power supply is applied to the
relay and the relay is having sufficient energy to trip through the impulse output.
2.6.3.4 Low Battery LED
The low battery LED indicates when the battery voltage falls below the sufficient operating voltage.
2.6.4

Local Flag

An electromechanical bi-stable flag is provided in the front fascia to indicate the trip condition. The status of flag is
GREEN in normal condition and turns RED during the trip condition.
NOTE:
The energy required to show the trip indication is provided by the auxiliary voltage or phase currents.
The flag indicates a trip indication when any protection function operates or any binary inputs are mapped to trip
pulse output.
The trip indication is retained even in the absence of auxiliary voltage and phase currents.
The trip indication can be reset with any power mode. Refer to
©2018 Siemens Protection Devices Limited
Table 2-1 LED Functions
Indication Color
Indicates the relay protection function in a healthy state
GREEN
The trip indication for the phase/earth faults
RED
The pickup indication for the phase/earth faults
AMBER
The pickup indication for phase A fault
RED
The pickup indication for phase B fault
RED
The pickup indication for phase C fault
RED
The pickup indication for Derived/Measured Earth fault
RED
The sufficient energy available for tripping
GREEN
The battery voltage is less than the operating level
AMBER
Chapter 1 - 7SR45 Description of Operation
Functions
Modes of operation.
Chapter 1 Page 20 of 48